From nobody Mon Sep 1 04:51:20 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 43A171A039A for ; Mon, 1 Sep 2014 04:51:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.299 X-Spam-Level: X-Spam-Status: No, score=0.299 tagged_above=-999 required=5 tests=[BAYES_50=0.8, J_CHICKENPOX_38=0.6, J_CHICKENPOX_45=0.6, J_CHICKENPOX_46=0.6, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pj0C3eRMiNMD for ; Mon, 1 Sep 2014 04:51:15 -0700 (PDT) Received: from sesbmg22.ericsson.net (sesbmg22.ericsson.net [193.180.251.48]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B25B81A02BD for ; Mon, 1 Sep 2014 04:51:14 -0700 (PDT) X-AuditID: c1b4fb30-f79736d0000053b8-c2-54045daf5136 Received: from ESESSHC018.ericsson.se (Unknown_Domain [153.88.253.124]) by sesbmg22.ericsson.net (Symantec Mail Security) with SMTP id B9.E9.21432.FAD54045; Mon, 1 Sep 2014 13:51:12 +0200 (CEST) Received: from ESESSMB105.ericsson.se ([169.254.5.48]) by ESESSHC018.ericsson.se ([153.88.183.72]) with mapi id 14.03.0174.001; Mon, 1 Sep 2014 13:51:11 +0200 From: Bo Burman To: Christian Groves , "avtext@ietf.org" Thread-Topic: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 Thread-Index: Ac+oI8943NA5z66dRdGqdkJ2oCY7RQSn2IaAAC2sUTAALZTUgABGai2QARodEgABAng3IA== Date: Mon, 1 Sep 2014 11:51:10 +0000 Message-ID: References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com> <53F1DD5D.6030204@nteczone.com> <53F441C3.5050201@nteczone.com> <53FD7F8A.6060608@nteczone.com> In-Reply-To: <53FD7F8A.6060608@nteczone.com> Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.18] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrELMWRmVeSWpSXmKPExsUyM+Jvje6GWJYQg/PdTBYf791gtfjyvpHF gcljyZKfTB4rzs9kCWCK4rJJSc3JLEst0rdL4MqYdNu24EpIxbf7zewNjAtduhg5OSQETCRO rvrECmGLSVy4t56ti5GLQ0jgKKPEid/tTBDOIkaJLTs/MYNUsQloSMzfcZcRxBYRiJbY2vMZ LC4s4Cox9dE9Zoi4m8SvOzvZIOwwiWUHZjOB2CwCKhKbT30G6+UV8JWY92sqO8SCE0wS7y4d ZQFJcAroSGz/NA3MZhSQlbj//R6YzSwgLnHryXwmiFMFJJbsOc8MYYtKvHz8D+oFRYmPr/Yx QtTrSCzY/YkNwtaWWLbwNTPEYkGJkzOfsExgFJ2FZOwsJC2zkLTMQtKygJFlFaNocWpxUm66 kZFealFmcnFxfp5eXmrJJkZgpBzc8ttgB+PL546HGAU4GJV4eB/MYg4RYk0sK67MPcQozcGi JM678Ny8YCGB9MSS1OzU1ILUovii0pzU4kOMTBycUg2MLrJs+5cLMZRVKMRXmqTK3ZnaKvHz haebdE7PW6ZtbNNXLxc3vKllf8ri2YOFTj4xj741mcn9lP3U/kc07P21LaviXGOnyxaw+JrZ HnSzXPD4rdK32vRAx7sni14p5QtOaG7RLSoSve3aqWRc+MHD7OLd1E/tR5XMF7xjPfm2mCdn L5+Hn4MSS3FGoqEWc1FxIgBS0UhrdQIAAA== Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/kZgpJ0wl2orQMlOPon8jfphtRXY Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Sep 2014 11:51:18 -0000 Hello Christian, see inline below Cheers, Bo > -----Original Message----- > From: Christian Groves [mailto:Christian.Groves@nteczone.com] > Sent: den 27 augusti 2014 08:50 > To: Bo Burman; avtext@ietf.org > Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 >=20 > Hello Bo, >=20 > Please see below. >=20 > Regards, Christian >=20 > On 22/08/2014 10:35 PM, Bo Burman wrote: > > ..snip.. > >> 2) Clause 9: Use of PAUSE and PAUSED: I must admit I find the > >> distinction between these two parameters really confusing. Especially = when the draft says that they are different > functions but that "pause" > >> encompasses "paused". It is really necessary to have two parameters? > >> It seems that a node can do the following with respect to the messages= : > >> a) Both send and receive PAUSE, RESUME, PAUSED and REFUSE > >> b) Send PAUSE, RESUME and receive PAUSED and REFUSE only > >> c) Receive PAUSE, RESUME and send PAUSED and REFUSE only > >> d) Do not receive messages but send a PAUSED only. > >> > >> The issue seems to come when considering the local PAUSE functionality= . > >> As the draft notes that "pause" contains the full "paused" > >> functionality", I could assume that a) b) and c) contain the local > >> PAUSE functionality. d) would also have to contain the local PAUSE > >> functionality. However I'm not sure b) would be valid because the > >> node would have to be able to send PAUSED as a result of clause 5.3. W= hilst the intent is that 'pause' and 'paused' are > different functions there would appear to be interactions. e.g. It would = be strange to set 'pause=3Drecvonly' and > 'paused=3Drecvonly'. > >> > >> I think the usage at least needs to be clarified as there appears to > >> be some overlap and inconsistencies with other sections. Preferably it= would be good to try to use one parameter. > > [BoB]: Good catch and good analysis! > > > > To go back to the design intent of "paused" and if I remember correctly= , I believe it was to allow for a very restricted > implementation that supports/knows _only_ "local pause" functionality, an= d additionally (with the dir=3D parameter) allow > for just a) sending the indication, b) just receiving it, or c) both. Thi= s is however not motivated or required by any of the > currently included use cases. It seems that some parts of the current tex= t, for example clause 5.1, confuses the use of > "paused" with what is actually solved by the direction parameter of "paus= e". > > > > I think the following two main options are reasonable ways forward: > > > > 1) Remove the "paused" SDP parameter entirely, and with it the > > possibility to implement support of only the local pause indication > > > > 2) Make the text consistently express that "paused" refers to capabilit= y for that limited functionality. For SDP > offer/answer, we then have a few more choices regarding the relation betw= een "pause" and "paused": > > > > a) an offer expressing support for this specification MUST contain on= ly one of "pause" or "paused", and an offer > with "pause" is possible to restrict by answering with "paused", but an o= ffer with the limited "paused" cannot be > upgraded to "pause" in the answer. May possibly cause problems with decla= rative use; guidance appreciated. > > > > b) "pause" and "paused" are kept separate (what current text mostly > > does, except for some confusion that must be corrected throughout if > > this option is chosen); the offer MAY contain either or both, while > > the answer MUST choose one and MUST NOT add anything that was not in > > the offer > [CNG] I wasn't following this closely when 'paused' was added so I'm not = sure about removing it. It would simplify things > if it was removed. > I think what would need to be added if local pause was supported without = signalling is that a node supporting this draft > must at minimum support the reception of a 'paused' indication and the se= nding of 'paused' if the node supports a > paused state. There would probably need to be an extra value in direction= indicating that PAUSE/RESUME is not sent or > received. [BoB] You mean using additional direction signaling for pause instead of th= e tag "paused"? I don't see how that goes with your statement "supported wi= thout signaling" a few sentences back, since that is then also explicit sig= naling? >=20 > Maybe an option 2c: If local pause is kept and it needs to be supported b= y signalling there actually appears to be 8 > combinations of sent and received messages. I assume a node supporting th= e sending and/or reception of PAUSE must > also support RESUME. A node supporting the reception of PAUSE/RESUME must= also support sending PAUSED and > REFUSED. [BoB] An observation: I see you more or less consistently using "REFUSED" i= nstead of the currently defined tag "REFUSE". This is actually consistent w= ith it being an indication/response rather than a command, and thus probabl= y a better name. Do you suggest that we change the name to "REFUSED" in the= draft? > The combinations a Node can support are: >=20 > 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive (PAUSED,RESUMED,PAUSED,REFUS= ED) > 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) > 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) > 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) > 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) > 6) Send(PAUSED) Receive(PAUSED) > 7) Send() Receive(PAUSED) > 8) Send(PAUSED) Receive() >=20 > Would it be easier to simply signal the messages that are supported rathe= r than two parameters with a direction > parameters? e.g. the draft could have the above list of values. If a node= supported both the sending and reception of > PAUSE/RESUME/PAUSED/REFUSED then it could signal e.g. a=3Drtcp-fb:98 ccm = pause config=3D1 . Part of the confusion > comes from the interaction between the parameters. This would remove the = interaction. >=20 > It might make describing the SDP O/A procedures easier. > e.g. > On receiving an Offer with: > config=3D1 the answerer may reply with config=3D1, 2, 3, 4, 5, 6, 7 or 8. > config=3D2 the answerer may reply with config=3D3, 4, 5, 6, 7 or 8. > config=3D3 the answerer may reply with config=3D2, 4, 5, 6, 7 or 8. > config=3D4 the answerer may reply with config=3D5, 6, 7 or 8. > config=3D5 the answerer may reply with config=3D4, 6, 7 or 8. > config=3D6 the answerer may reply with config=3D6, 7 or 8. > config=3D7 the answerer may reply with config=3D8 > config=3D8 the answerer may reply with config=3D7 In all cases the answer= er may reply with a completely removed "pause" > parameter. >=20 > An answerer cannot add extra messages to what is provided in the Offer. > For example: If an Offer indicates config=3D6 an Answer cannot reply with > config=3D3 indicating that it has the capability to receive PAUSE and RES= UME. An answerer may remove messages that it > does not support. For > example: if an Offer indicates config=3D6 an Answer may reply with > config=3D7 indicating that it can only receive PAUSED. [BoB] I get your point. There is significant inherent complexity in this th= at your proposal makes explicit and clarifies. I would like to simplify and= clarify this further by reducing the allowed configurations to be 1, 4, 5 = and 6: 1) Full support of sending and receiving all messages ("ccm pause" without = direction) As you say above, acceptable Answers include 1, 4, 5 or 6, or (of course) = removing "ccm pause" entirely 4) Pause command receiver, sending result indications ("ccm pause dir=3Drec= vonly") Acceptable Answers include 5, 6, or removing ccm pause entirely 5) Pause command sender, receiving result indications ("ccm pause dir=3Dsen= donly") Acceptable Answers include 4, 6, or removing ccm pause entirely 6) Local pause support only ("ccm paused", and I then suggest removing dire= ction from paused; either you support it or you don't) Acceptable Answers include 6 or removing ccm paused entirely If those clarifications you list above on O/A and what messages are sent an= d/or received are made in the document, do you still think we need to intro= duce the "config" concept, or will the direction parameter to "pause" (as i= ndicated in my shortened list above) be clear enough? I wonder, is it rather the notion of "direction" that becomes confusing, si= nce "recvonly" actually includes sending messages, only those messages are = not "PAUSE" and "RESUME"? In that case, could we call it something else tha= n "direction"; like "dir=3Dsendonly" -> "command-only" and "dir=3Drecvonly"= -> "indication-only"? >=20 >=20 >=20 > >> 3) Clause 5.1 indicates "/ Capability to understand PAUSED > >> indication is defined separately from the others to support partial > >> implementation, which is specifically believed to be feasible for the > >> RTP Mixer to Media Sender use case (Section 3.2)./" I guess the import= ant thing is that its the media sender that must > at least support the PAUSED indication, the mixer needs to support PAUSE. > > [BoB]: As said above, signaling for the mixer case is a bit confused in= 5.1, and better dealt with (and covered) by having > either dir=3Dsendonly or dir=3Drecvonly to pause parameter, depending on = desired functionality restriction. Only supporting > local PAUSED, indicated by "paused" SDP parameter, is a separate issue an= d should be made clearer, if not removed (see > above). > > > >> 4) Clause 10.1 paragraph below the figure. Indicates "/includes the > >> "nowait" sub-parameter for both "pause" and "paused" parameters/" > >> however the nowait parameter is only specified in the example offer > >> for pause + nowait is not defined for paused in the ABNF syntax. > > [BoB]: Correct. Only "pause" should be in the sentence above. > > > >> The last paragraph in clause 9.1 also indicates that possibility to > >> support "nowait" for "paused" i.e. "/The answerer MUST NOT add > >> "nowait" on the "pause" line in the answer unless it is present on the= "paused" line in the offer./" This isn't possible > due to the syntax. > > [BoB]: Correct. Probably a typo; "paused" -> "pause". > > > >> 5) Clause 9.1 paragraph 2: "/In other words, an offer for "paused > >> dir=3Dsendonly" means that the offerer intends to send PAUSED > >> indications whenever it pauses RTP stream delivery in any of its strea= ms./" Would a pause in one stream require > sending a PAUSED indication in multiple streams? > > [BoB]: No, only for the actually paused stream; unclear wording. What a= bout simply "...intends to send PAUSED > indications for paused RTP streams"? > [CNG] OK > > > > From nobody Mon Sep 1 17:45:42 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 750D31A6F21 for ; Mon, 1 Sep 2014 17:45:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.199 X-Spam-Level: * X-Spam-Status: No, score=1.199 tagged_above=-999 required=5 tests=[BAYES_40=-0.001, J_CHICKENPOX_45=0.6, J_CHICKENPOX_46=0.6] autolearn=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7e2k3KuNiuhD for ; Mon, 1 Sep 2014 17:45:40 -0700 (PDT) Received: from cserver5.myshophosting.com (cserver5.myshophosting.com [175.107.161.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AE65F1A6F1F for ; Mon, 1 Sep 2014 17:45:39 -0700 (PDT) Received: from ppp118-209-119-165.lns20.mel4.internode.on.net ([118.209.119.165]:53314 helo=[127.0.0.1]) by cserver5.myshophosting.com with esmtpsa (TLSv1:DHE-RSA-AES128-SHA:128) (Exim 4.82) (envelope-from ) id 1XOcBF-0002HF-Dn; Tue, 02 Sep 2014 10:42:41 +1000 Message-ID: <54051326.5090103@nteczone.com> Date: Tue, 02 Sep 2014 10:45:26 +1000 From: Christian Groves User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Bo Burman , "avtext@ietf.org" References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com> <53F1DD5D.6030204@nteczone.com> <53F441C3.5050201@nteczone.com> <53FD7F8A.6060608@nteczone.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cserver5.myshophosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - nteczone.com X-Get-Message-Sender-Via: cserver5.myshophosting.com: authenticated_id: christian.groves@nteczone.com X-Source: X-Source-Args: X-Source-Dir: Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/w6ew65weNCVTCW1Ux8CHv0hfQ7E Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Sep 2014 00:45:41 -0000 Hello Bo, Please see my replies below. Regards, Christian On 1/09/2014 9:51 PM, Bo Burman wrote: > ..snip.. > I think the following two main options are reasonable ways forward: > > 1) Remove the "paused" SDP parameter entirely, and with it the > possibility to implement support of only the local pause indication > > 2) Make the text consistently express that "paused" refers to capability for that limited functionality. For SDP >> offer/answer, we then have a few more choices regarding the relation between "pause" and "paused": >>> a) an offer expressing support for this specification MUST contain only one of "pause" or "paused", and an offer >> with "pause" is possible to restrict by answering with "paused", but an offer with the limited "paused" cannot be >> upgraded to "pause" in the answer. May possibly cause problems with declarative use; guidance appreciated. >>> b) "pause" and "paused" are kept separate (what current text mostly >>> does, except for some confusion that must be corrected throughout if >>> this option is chosen); the offer MAY contain either or both, while >>> the answer MUST choose one and MUST NOT add anything that was not in >>> the offer >> [CNG] I wasn't following this closely when 'paused' was added so I'm not sure about removing it. It would simplify things >> if it was removed. >> I think what would need to be added if local pause was supported without signalling is that a node supporting this draft >> must at minimum support the reception of a 'paused' indication and the sending of 'paused' if the node supports a >> paused state. There would probably need to be an extra value in direction indicating that PAUSE/RESUME is not sent or >> received. > [BoB] You mean using additional direction signaling for pause instead of the tag "paused"? I don't see how that goes with your statement "supported without signaling" a few sentences back, since that is then also explicit signaling? [CNG] Yes an additional direction. I was thinking about how to specify "local pause" where the endpoint didn't support sendonly,recvonly or sendrecv. It wouldn't be correct for the endpoint to send "a=rtcp-fb:* ccm pause" because the default is "sendrecv". > >> Maybe an option 2c: If local pause is kept and it needs to be supported by signalling there actually appears to be 8 >> combinations of sent and received messages. I assume a node supporting the sending and/or reception of PAUSE must >> also support RESUME. A node supporting the reception of PAUSE/RESUME must also support sending PAUSED and >> REFUSED. > [BoB] An observation: I see you more or less consistently using "REFUSED" instead of the currently defined tag "REFUSE". This is actually consistent with it being an indication/response rather than a command, and thus probably a better name. Do you suggest that we change the name to "REFUSED" in the draft? [CNG] I wasn't proposing the change, I guess I just aligned "paused" and "refused". I'd be OK with changing it. > >> The combinations a Node can support are: >> >> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive (PAUSED,RESUMED,PAUSED,REFUSED) >> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) >> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) >> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) >> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) >> 6) Send(PAUSED) Receive(PAUSED) >> 7) Send() Receive(PAUSED) >> 8) Send(PAUSED) Receive() >> >> Would it be easier to simply signal the messages that are supported rather than two parameters with a direction >> parameters? e.g. the draft could have the above list of values. If a node supported both the sending and reception of >> PAUSE/RESUME/PAUSED/REFUSED then it could signal e.g. a=rtcp-fb:98 ccm pause config=1 . Part of the confusion >> comes from the interaction between the parameters. This would remove the interaction. >> >> It might make describing the SDP O/A procedures easier. >> e.g. >> On receiving an Offer with: >> config=1 the answerer may reply with config=1, 2, 3, 4, 5, 6, 7 or 8. >> config=2 the answerer may reply with config=3, 4, 5, 6, 7 or 8. >> config=3 the answerer may reply with config=2, 4, 5, 6, 7 or 8. >> config=4 the answerer may reply with config=5, 6, 7 or 8. >> config=5 the answerer may reply with config=4, 6, 7 or 8. >> config=6 the answerer may reply with config=6, 7 or 8. >> config=7 the answerer may reply with config=8 >> config=8 the answerer may reply with config=7 In all cases the answerer may reply with a completely removed "pause" >> parameter. >> >> An answerer cannot add extra messages to what is provided in the Offer. >> For example: If an Offer indicates config=6 an Answer cannot reply with >> config=3 indicating that it has the capability to receive PAUSE and RESUME. An answerer may remove messages that it >> does not support. For >> example: if an Offer indicates config=6 an Answer may reply with >> config=7 indicating that it can only receive PAUSED. > [BoB] I get your point. There is significant inherent complexity in this that your proposal makes explicit and clarifies. I would like to simplify and clarify this further by reducing the allowed configurations to be 1, 4, 5 and 6: > > 1) Full support of sending and receiving all messages ("ccm pause" without direction) > As you say above, acceptable Answers include 1, 4, 5 or 6, or (of course) removing "ccm pause" entirely > 4) Pause command receiver, sending result indications ("ccm pause dir=recvonly") > Acceptable Answers include 5, 6, or removing ccm pause entirely > 5) Pause command sender, receiving result indications ("ccm pause dir=sendonly") > Acceptable Answers include 4, 6, or removing ccm pause entirely > 6) Local pause support only ("ccm paused", and I then suggest removing direction from paused; either you support it or you don't) > Acceptable Answers include 6 or removing ccm paused entirely [CNG] So to remove 2 and 3 the assumption must be that local pause is not supported by a sendonly or receive only endpoint. Is that correct? It would seem that if local pause was to be supported then 2 and 3 should be selected rather than 4 and 5. To remove 7 and 8 the assumption must be that endpoints supporting this draft must support local pause? Otherwise there's no way of saying "I won't send anything but if you do a local pause let me know". > If those clarifications you list above on O/A and what messages are sent and/or received are made in the document, do you still think we need to introduce the "config" concept, or will the direction parameter to "pause" (as indicated in my shortened list above) be clear enough? [CNG] I think having "paused" as a separate parameter as in your proposal 6 just complicates things. Once you have two parameters then we come back to specifying the interaction between them. E.g. If A sends SDP "a=rtcp-fb:* ccm pause" if B only supports local pause does it reply back with a different parameter "a=rtcp-fb* ccm paused"? If so then it wouldn't make sense for an endpoint to send both "pause" and "paused". > > I wonder, is it rather the notion of "direction" that becomes confusing, since "recvonly" actually includes sending messages, only those messages are not "PAUSE" and "RESUME"? In that case, could we call it something else than "direction"; like "dir=sendonly" -> "command-only" and "dir=recvonly" -> "indication-only"? [CNG] Yes I think the direction is confusing considering that for pause it's opposite the RTP flow direction, for paused its the same. To support pause an endpoint will send and receive messages. I don't think "command-only"/"indication-only" help because they again relate to a direction. e.g. to support "sendonly" an endpoint sends commands PAUSE/RESUME and receives indications PAUSED/REFUSEd. I think being explicit makes the description much easier. ..snip.. From nobody Fri Sep 5 02:44:02 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BF8561A00E7 for ; Fri, 5 Sep 2014 02:44:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.502 X-Spam-Level: X-Spam-Status: No, score=-0.502 tagged_above=-999 required=5 tests=[BAYES_20=-0.001, J_CHICKENPOX_38=0.6, J_CHICKENPOX_45=0.6, J_CHICKENPOX_46=0.6, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0iNXn0cSOjXW for ; Fri, 5 Sep 2014 02:43:57 -0700 (PDT) Received: from sessmg23.ericsson.net (sessmg23.ericsson.net [193.180.251.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 002861A0535 for ; Fri, 5 Sep 2014 02:43:56 -0700 (PDT) X-AuditID: c1b4fb2d-f793d6d000005356-9e-540985db997d Received: from ESESSHC007.ericsson.se (Unknown_Domain [153.88.253.124]) by sessmg23.ericsson.net (Symantec Mail Security) with SMTP id E8.13.21334.BD589045; Fri, 5 Sep 2014 11:43:55 +0200 (CEST) Received: from ESESSMB105.ericsson.se ([169.254.5.48]) by ESESSHC007.ericsson.se ([153.88.183.39]) with mapi id 14.03.0174.001; Fri, 5 Sep 2014 11:43:54 +0200 From: Bo Burman To: Christian Groves , "avtext@ietf.org" Thread-Topic: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 Thread-Index: Ac+oI8943NA5z66dRdGqdkJ2oCY7RQSn2IaAAC2sUTAALZTUgABGai2QARodEgABAng3IAAejgIAAIUmrNA= Date: Fri, 5 Sep 2014 09:43:53 +0000 Message-ID: References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com> <53F1DD5D.6030204@nteczone.com> <53F441C3.5050201@nteczone.com> <53FD7F8A.6060608@nteczone.com> <54051326.5090103@nteczone.com> In-Reply-To: <54051326.5090103@nteczone.com> Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.16] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrELMWRmVeSWpSXmKPExsUyM+Jvje7tVs4Qg9VHhS0+3rvBavHlfSOL A5PHkiU/mTxWnJ/JEsAUxWWTkpqTWZZapG+XwJUx+/ZJxoKDERXvJhxnbWA85d7FyMkhIWAi 0f5pKyuELSZx4d56ti5GLg4hgaOMEu3TzjGCJIQEFjFKLO7wBbHZBDQk5u+4CxYXEYiW2Nrz mRnEFhZwlZj66B4zRNxN4tednWwQdpLEx3tvwOIsAioSG6dvA7N5BXwlLn7uZYZYto5Z4vat eywgCU4BHYmelmawBYwCshL3v0PEmQXEJW49mc8EcamAxJI955khbFGJl4//QX2gKLHzbDsz RL2OxILdn9ggbG2JZQtfQy0WlDg58wnLBEbRWUjGzkLSMgtJyywkLQsYWVYxihanFhfnphsZ 66UWZSYXF+fn6eWllmxiBEbKwS2/dXcwrn7teIhRgINRiYdXQZIzRIg1say4MvcQozQHi5I4 76Jz84KFBNITS1KzU1MLUovii0pzUosPMTJxcEo1MM4xlPq39nHOrmWW+dqb3tzv2qJiImlZ uHHLY5vdqy/0MbQZ1ryMrN/TcvXd7rUZEtPaLrZtmqb3Kznv7TzOV+kHTtRLWq1bPm/L4md3 /UU/brLWFeIWaDll4bL/9FXPn1rH9ymnMHZN8XX2EV335Yffc60PJ6ccUNO0zKze/PSQoK/s A/ZZmUxKLMUZiYZazEXFiQBoFZi2dQIAAA== Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/TIyEUiiEXLKh8sqpfKf2Hh7IkDA Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Sep 2014 09:44:01 -0000 Hi Christian, More inline. As a summary, I must conclude that Christian's proposal has consistency and= clarity benefits in SDP signaling compared to what is currently in the tex= t, and suggest that the text should be changed accordingly: * The "dir" parameter of "ccm pause" is replaced by "config" as suggested b= elow. * The separate "ccm paused" parameter is removed, since support of PAUSED w= ill instead be indicated through "config" BR /Bo > -----Original Message----- > From: Christian Groves [mailto:Christian.Groves@nteczone.com] > Sent: den 2 september 2014 02:45 > To: Bo Burman; avtext@ietf.org > Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 >=20 > Hello Bo, >=20 > Please see my replies below. >=20 > Regards, Christian >=20 > On 1/09/2014 9:51 PM, Bo Burman wrote: > > ..snip.. > > I think the following two main options are reasonable ways forward: > > > > 1) Remove the "paused" SDP parameter entirely, and with it the > > possibility to implement support of only the local pause indication > > > > 2) Make the text consistently express that "paused" refers to > > capability for that limited functionality. For SDP > >> offer/answer, we then have a few more choices regarding the relation b= etween "pause" and "paused": > >>> a) an offer expressing support for this specification MUST contain > >>> only one of "pause" or "paused", and an offer > >> with "pause" is possible to restrict by answering with "paused", but > >> an offer with the limited "paused" cannot be upgraded to "pause" in th= e answer. May possibly cause problems with > declarative use; guidance appreciated. > >>> b) "pause" and "paused" are kept separate (what current text mostly > >>> does, except for some confusion that must be corrected throughout if > >>> this option is chosen); the offer MAY contain either or both, while > >>> the answer MUST choose one and MUST NOT add anything that was not in > >>> the offer > >> [CNG] I wasn't following this closely when 'paused' was added so I'm > >> not sure about removing it. It would simplify things if it was removed= . > >> I think what would need to be added if local pause was supported > >> without signalling is that a node supporting this draft must at > >> minimum support the reception of a 'paused' indication and the > >> sending of 'paused' if the node supports a paused state. There would p= robably need to be an extra value in direction > indicating that PAUSE/RESUME is not sent or received. > > [BoB] You mean using additional direction signaling for pause instead o= f the tag "paused"? I don't see how that goes > with your statement "supported without signaling" a few sentences back, s= ince that is then also explicit signaling? > [CNG] Yes an additional direction. I was thinking about how to specify "l= ocal pause" where the endpoint didn't support > sendonly,recvonly or sendrecv. It wouldn't be correct for the endpoint to= send "a=3Drtcp-fb:* ccm pause" because the > default is "sendrecv". [BoB] Thinking this through again. It is possible to make the currently pro= posed signaling in the draft consistent, but only if capability and indicat= ion of pause and local pause are changed to be totally independent function= s. The 8 configurations you list are then possible to express, using direct= ion parameter of both pause and paused ([] indicates optional). 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive (PAUSED,RESUMED,PAUSED,REFUSED= ) a=3Drtcp-fb:* ccm pause [dir=3Dsendrecv] a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) a=3Drtcp-fb:* ccm pause dir=3Dsendonly a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) a=3Drtcp-fb:* ccm pause dir=3Drecvonly a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) a=3Drtcp-fb:* ccm pause dir=3Drecvonly a=3Drtcp-fb:* ccm paused dir=3Dsendonly 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) a=3Drtcp-fb:* ccm pause dir=3Dsendonly a=3Drtcp-fb:* ccm paused dir=3Drecvonly 6) Send(PAUSED) Receive(PAUSED) a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] 7) Send() Receive(PAUSED) a=3Drtcp-fb:* ccm paused dir=3Drecvonly 8) Send(PAUSED) Receive() a=3Drtcp-fb:* ccm paused dir=3Dsendonly That split would however also mean there is a possibility to support PAUSE = but not PAUSED, which I believe is an undesirable side-effect and definitel= y not in line with the current text. As a summary, I must agree that your proposal to use a "config" parameter w= ith an explicit listing of supported messages and directions is indeed much= easier to describe and is beneficial for text clarity. > > > >> Maybe an option 2c: If local pause is kept and it needs to be > >> supported by signalling there actually appears to be 8 combinations > >> of sent and received messages. I assume a node supporting the sending > >> and/or reception of PAUSE must also support RESUME. A node supporting = the reception of PAUSE/RESUME must also > support sending PAUSED and REFUSED. > > [BoB] An observation: I see you more or less consistently using "REFUSE= D" instead of the currently defined tag > "REFUSE". This is actually consistent with it being an indication/respons= e rather than a command, and thus probably a > better name. Do you suggest that we change the name to "REFUSED" in the d= raft? > [CNG] I wasn't proposing the change, I guess I just aligned "paused" and = "refused". I'd be OK with changing it. [BoB] Unless someone else objects, I will change REFUSE to REFUSED througho= ut, to better reflect that it is an indication, not a command. > > > >> The combinations a Node can support are: > >> > >> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive > >> (PAUSED,RESUMED,PAUSED,REFUSED) > >> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) > >> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) > >> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) > >> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) > >> 6) Send(PAUSED) Receive(PAUSED) > >> 7) Send() Receive(PAUSED) > >> 8) Send(PAUSED) Receive() > >> > >> Would it be easier to simply signal the messages that are supported > >> rather than two parameters with a direction parameters? e.g. the > >> draft could have the above list of values. If a node supported both > >> the sending and reception of PAUSE/RESUME/PAUSED/REFUSED then it could= signal e.g. a=3Drtcp-fb:98 ccm pause > config=3D1 . Part of the confusion comes from the interaction between the= parameters. This would remove the interaction. > >> > >> It might make describing the SDP O/A procedures easier. > >> e.g. > >> On receiving an Offer with: > >> config=3D1 the answerer may reply with config=3D1, 2, 3, 4, 5, 6, 7 or= 8. > >> config=3D2 the answerer may reply with config=3D3, 4, 5, 6, 7 or 8. > >> config=3D3 the answerer may reply with config=3D2, 4, 5, 6, 7 or 8. > >> config=3D4 the answerer may reply with config=3D5, 6, 7 or 8. > >> config=3D5 the answerer may reply with config=3D4, 6, 7 or 8. > >> config=3D6 the answerer may reply with config=3D6, 7 or 8. > >> config=3D7 the answerer may reply with config=3D8 > >> config=3D8 the answerer may reply with config=3D7 > >> In all cases the answerer may reply with a completely removed "pause" > >> parameter. > >> > >> An answerer cannot add extra messages to what is provided in the Offer= . > >> For example: If an Offer indicates config=3D6 an Answer cannot reply > >> with > >> config=3D3 indicating that it has the capability to receive PAUSE and > >> RESUME. An answerer may remove messages that it does not support. For > >> example: if an Offer indicates config=3D6 an Answer may reply with > >> config=3D7 indicating that it can only receive PAUSED. > > [BoB] I get your point. There is significant inherent complexity in thi= s that your proposal makes explicit and clarifies. I > would like to simplify and clarify this further by reducing the allowed c= onfigurations to be 1, 4, 5 and 6: > > > > 1) Full support of sending and receiving all messages ("ccm pause" with= out direction) > > As you say above, acceptable Answers include 1, 4, 5 or 6, or (of > > course) removing "ccm pause" entirely > > 4) Pause command receiver, sending result indications ("ccm pause dir= =3Drecvonly") > > Acceptable Answers include 5, 6, or removing ccm pause entirely > > 5) Pause command sender, receiving result indications ("ccm pause dir= =3Dsendonly") > > Acceptable Answers include 4, 6, or removing ccm pause entirely > > 6) Local pause support only ("ccm paused", and I then suggest removing = direction from paused; either you support it or > you don't) > > Acceptable Answers include 6 or removing ccm paused entirely > [CNG] So to remove 2 and 3 the assumption must be that local pause is not= supported by a sendonly or receive only > endpoint. Is that correct? > It would seem that if local pause was to be supported then 2 and 3 should= be selected rather than 4 and 5. > To remove 7 and 8 the assumption must be that endpoints supporting= this draft must support local pause? Otherwise > there's no way of saying "I won't send anything but if you do a local pau= se let me know". [BoB] I agree the 8 configurations you list makes sense to keep. They refle= ct the current text better than what I suggested. > > If those clarifications you list above on O/A and what messages are sen= t and/or received are made in the document, do > you still think we need to introduce the "config" concept, or will the di= rection parameter to "pause" (as indicated in my > shortened list above) be clear enough? > [CNG] I think having "paused" as a separate parameter as in your proposal= 6 just complicates things. Once you have two > parameters then we come back to specifying the interaction between them. = E.g. If A sends SDP "a=3Drtcp-fb:* ccm pause" > if B only supports local pause does it reply back with a different parame= ter "a=3Drtcp-fb* ccm paused"? If so then it > wouldn't make sense for an endpoint to send both "pause" and "paused". [BoB] As said above, just signaling ccm pause would have to mean that pause= d is not supported, so there would be no way to fall back to local pause, w= hich is undesirable. Your "config" is better. > > > > I wonder, is it rather the notion of "direction" that becomes confusing= , since "recvonly" actually includes sending > messages, only those messages are not "PAUSE" and "RESUME"? In that case,= could we call it something else than > "direction"; like "dir=3Dsendonly" -> "command-only" and "dir=3Drecvonly"= -> "indication-only"? > [CNG] Yes I think the direction is confusing considering that for pause i= t's opposite the RTP flow direction, for paused its > the same. To support pause an endpoint will send and receive messages. I = don't think "command-only"/"indication-only" > help because they again relate to a direction. e.g. to support "sendonly"= an endpoint sends commands PAUSE/RESUME > and receives indications PAUSED/REFUSEd. I think being explicit makes the= description much easier. [BoB] Agree From nobody Tue Sep 9 17:20:21 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CF8B31A0114 for ; Tue, 9 Sep 2014 17:20:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.8 X-Spam-Level: X-Spam-Status: No, score=0.8 tagged_above=-999 required=5 tests=[BAYES_50=0.8] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oYl72S6UwZUR for ; Tue, 9 Sep 2014 17:20:06 -0700 (PDT) Received: from cserver5.myshophosting.com (cserver5.myshophosting.com [175.107.161.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0B4091A00FF for ; Tue, 9 Sep 2014 17:20:04 -0700 (PDT) Received: from ppp118-209-187-65.lns20.mel8.internode.on.net ([118.209.187.65]:54926 helo=[127.0.0.1]) by cserver5.myshophosting.com with esmtpsa (TLSv1:DHE-RSA-AES128-SHA:128) (Exim 4.82) (envelope-from ) id 1XRVdT-0000Up-B4 for avtext@ietf.org; Wed, 10 Sep 2014 10:19:47 +1000 Message-ID: <540F9922.8060705@nteczone.com> Date: Wed, 10 Sep 2014 10:19:46 +1000 From: Christian Groves User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: "avtext@ietf.org" Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cserver5.myshophosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - nteczone.com X-Get-Message-Sender-Via: cserver5.myshophosting.com: authenticated_id: christian.groves@nteczone.com X-Source: X-Source-Args: X-Source-Dir: Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/7QW1cmKBmLtN-O5Jxy2AxnJxWz8 Subject: [avtext] RTP stream pause and keepalives X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Sep 2014 00:20:10 -0000 Hello Bo, A colleague mentioned there might be an issue with regards to heartbeats keeping NAT resources open, i.e. as per clause 10/RFC5245 when an RTP stream is paused. We probably need to add some text to the draft to indicate what happens when an RTP stream is paused. I take it that normal media should be paused but that any RTP keepalive (e.g. comfort noise, No-Op or incorrect version) should still be transmitted. Regards, Christian From nobody Wed Sep 10 00:35:33 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 78D681A0669 for ; Wed, 10 Sep 2014 00:35:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.201 X-Spam-Level: X-Spam-Status: No, score=-4.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id McV1X9JOut5n for ; Wed, 10 Sep 2014 00:35:30 -0700 (PDT) Received: from sessmg23.ericsson.net (sessmg23.ericsson.net [193.180.251.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5C1B11A0657 for ; Wed, 10 Sep 2014 00:35:30 -0700 (PDT) X-AuditID: c1b4fb2d-f793d6d000005356-74-540fff4071c2 Received: from ESESSHC024.ericsson.se (Unknown_Domain [153.88.253.124]) by sessmg23.ericsson.net (Symantec Mail Security) with SMTP id C3.DF.21334.04FFF045; Wed, 10 Sep 2014 09:35:28 +0200 (CEST) Received: from ESESSMB105.ericsson.se ([169.254.5.215]) by ESESSHC024.ericsson.se ([153.88.183.90]) with mapi id 14.03.0174.001; Wed, 10 Sep 2014 09:35:27 +0200 From: Bo Burman To: Christian Groves , "avtext@ietf.org" Thread-Topic: [avtext] RTP stream pause and keepalives Thread-Index: AQHPzI0E+Kr8YvHSDEqOcWX2GY8UVJv56rVQ Date: Wed, 10 Sep 2014 07:35:27 +0000 Message-ID: References: <540F9922.8060705@nteczone.com> In-Reply-To: <540F9922.8060705@nteczone.com> Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.146] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrALMWRmVeSWpSXmKPExsUyM+Jvja7Df/4Qg/1TpCw+3rvBavHlfSOL A5PHkiU/mTxWnJ/JEsAUxWWTkpqTWZZapG+XwJWxp3kBY8Eb4Yr3i14xNjC2CHQxcnJICJhI fD4xjx3CFpO4cG89WxcjF4eQwFFGifWruxghnCWMEh8eHGMBqWIT0JCYv+MuI4gtIhAtsbXn MzOILSxgKvF74S2gOAdQ3ExixztuiBIjiTXnroAtYBFQlZix6RIriM0r4CvxYuVdVpByIQFt iZU3FUHCnAI6Enu7r4FtYhSQlbj//R6YzSwgLnHryXwmiDsFJJbsOc8MYYtKvHz8jxXCVpL4 seESVL2OxILdn9ggbG2JZQtfM0OsFZQ4OfMJywRG0VlIxs5C0jILScssJC0LGFlWMYoWpxYX 56YbGeulFmUmFxfn5+nlpZZsYgRGycEtv3V3MK5+7XiIUYCDUYmHd8EG/hAh1sSy4srcQ4zS HCxK4ryLzs0LFhJITyxJzU5NLUgtii8qzUktPsTIxMEp1cDoIBV4rG2PRdx3j7xda70fcyoJ LJp2ztWjP/PSj6Y3tlWbuBWYi2v23li5ZrJxmNvl7oztWqxrs9VnnxTxWrXooHbfnTc/P4ax BhpoHjh6cr3lKR+OK/uNL1VHfGRd6cMiECQknC6g2KN0ME//XcqDlBcNip90dmwIXHesZf3Z VT+amo4HvmpXYinOSDTUYi4qTgQAGKyhSnMCAAA= Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/ytTXi0BPl-VqYOGcQUNr18Inkvw Subject: Re: [avtext] RTP stream pause and keepalives X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Sep 2014 07:35:32 -0000 Hi Christian, You are entirely right, the intent is that RTP stream pause does not affect= keepalive. I have no problem with adding some clarifying statement. I also think sec 10 / RFC 5242 text is pretty clear on this: "These keepali= ves MUST be sent regardless of whether the media stream is currently inacti= ve, sendonly, recvonly, or sendrecv...", and even "...keepalives MUST be se= nt even if ICE is not being utilized for the session at all". I see RTP str= eam pause as being even more "temporary" than setting a stream inactive, so= a paused RTP stream should definitely be "live" enough to make the above R= FC 5245 statements apply. Do you think that a reference to RFC 5245 from the pause draft is appropria= te and sufficient? Tentative text, possibly after second clause of sec 6.3 ("Paused State"): "Pausing an RTP stream MUST NOT affect the sending of RTP keepalive [RFC524= 5] applicable to that RTP stream", as well as adding RFC 5245 as a normative reference. Is it correct to have = it as a normative reference, even if it is not mandated by this draft to ac= tually implement RFC 5245, but just referencing it in a normative statement= ? I don't think that referencing RFC 5245 opens up to allowing RTP stream pau= se affect "non-RFC 5245 keepalive", because the text in RFC 5245 seems gene= ric enough to cover any perceivable RTP keepalive procedure. Do you agree? I think including "applicable to that RTP stream" should also cover the cas= e when BUNDLE is used, because then a single keepalive can "apply" to multi= ple RTP streams. OK? Comments to text formulation and placement are welcome. Cheers, /Bo > -----Original Message----- > From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Christian Grov= es > Sent: den 10 september 2014 02:20 > To: avtext@ietf.org > Subject: [avtext] RTP stream pause and keepalives >=20 > Hello Bo, >=20 > A colleague mentioned there might be an issue with regards to heartbeats = keeping NAT resources open, i.e. as per > clause 10/RFC5245 when an RTP stream is paused. We probably need to add s= ome text to the draft to indicate what > happens when an RTP stream is paused. I take it that normal media should = be paused but that any RTP keepalive (e.g. > comfort noise, No-Op or incorrect version) should still be transmitted. >=20 > Regards, Christian >=20 > _______________________________________________ > avtext mailing list > avtext@ietf.org > https://www.ietf.org/mailman/listinfo/avtext From nobody Wed Sep 10 02:03:07 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D03271A06BF for ; Wed, 10 Sep 2014 02:03:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ngrWHpl6Ojrp for ; Wed, 10 Sep 2014 02:03:04 -0700 (PDT) Received: from mail-we0-x22b.google.com (mail-we0-x22b.google.com [IPv6:2a00:1450:400c:c03::22b]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 028AA1A06B8 for ; Wed, 10 Sep 2014 02:03:03 -0700 (PDT) Received: by mail-we0-f171.google.com with SMTP id p10so1872696wes.30 for ; Wed, 10 Sep 2014 02:03:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:references:in-reply-to:subject:date:message-id:mime-version :content-type:content-transfer-encoding:thread-index :content-language; bh=MtyLgfBl91+HQj3aqJR3c8aTJZUxn5mkvIOypRJoo7U=; b=fcAMtTiCp5PvzEWK1blecJyVPlhvx6cu73rYU+jHGzPBZYgHvZnvq8e6MTKGHZPGKw MNNi8YEG4UZXgrJ+p+1wJmMDg+lUuyoTCJsmkrdhvHmdANqP2v0kLabzfek2ydUoVKCM nZjjQQx4NV1OjIg4tGUg8ZIMoTOrr3NR035ECDp0qmFBXoLz1Nxazn+Rc7IRsiGSlcMI lfuHA/yKHbAAnZkPzqIKI6DPcQXg8cVyr3Nx5qxB91UoO1JinOLJ2R8z3EkEO64R/dGx r+nS/fXioT/1zBHcPjklgiFMDGCfWTT2WeFbd2QrsjDh0u22rnFTHGA6U4PV9yqna2p2 IxLw== X-Received: by 10.194.120.101 with SMTP id lb5mr10289792wjb.84.1410339782599; Wed, 10 Sep 2014 02:03:02 -0700 (PDT) Received: from RoniE (bzq-79-176-126-132.red.bezeqint.net. [79.176.126.132]) by mx.google.com with ESMTPSA id am1sm17748096wjc.29.2014.09.10.02.03.00 for (version=TLSv1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 10 Sep 2014 02:03:01 -0700 (PDT) From: "Roni Even" To: "'Bo Burman'" , "'Christian Groves'" , References: <540F9922.8060705@nteczone.com> In-Reply-To: Date: Wed, 10 Sep 2014 12:02:50 +0300 Message-ID: <002801cfccd6$01337190$039a54b0$@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQGQbTCXgpnCzptUQ9kRxVWtZA2kHAHso0CbnGlrCNA= Content-Language: en-us Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/ny6wLWVAuSnBFxhxeZeLflt_OJ4 Subject: Re: [avtext] RTP stream pause and keepalives X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Sep 2014 09:03:06 -0000 Hi Bo, I think the text you propose make sense. Wondering if we should reference RFC6263 and not RFC 5245 Roni > -----Original Message----- > From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bo Burman > Sent: 10 September, 2014 10:35 AM > To: Christian Groves; avtext@ietf.org > Subject: Re: [avtext] RTP stream pause and keepalives > > Hi Christian, > > You are entirely right, the intent is that RTP stream pause does not affect > keepalive. I have no problem with adding some clarifying statement. > > I also think sec 10 / RFC 5242 text is pretty clear on this: "These keepalives > MUST be sent regardless of whether the media stream is currently inactive, > sendonly, recvonly, or sendrecv...", and even "...keepalives MUST be sent even > if ICE is not being utilized for the session at all". I see RTP stream pause as > being even more "temporary" than setting a stream inactive, so a paused RTP > stream should definitely be "live" enough to make the above RFC 5245 > statements apply. > > Do you think that a reference to RFC 5245 from the pause draft is appropriate > and sufficient? > > Tentative text, possibly after second clause of sec 6.3 ("Paused State"): > "Pausing an RTP stream MUST NOT affect the sending of RTP keepalive > [RFC5245] applicable to that RTP stream", as well as adding RFC 5245 as a > normative reference. Is it correct to have it as a normative reference, even if it > is not mandated by this draft to actually implement RFC 5245, but just > referencing it in a normative statement? > > I don't think that referencing RFC 5245 opens up to allowing RTP stream pause > affect "non-RFC 5245 keepalive", because the text in RFC 5245 seems generic > enough to cover any perceivable RTP keepalive procedure. Do you agree? > > I think including "applicable to that RTP stream" should also cover the case > when BUNDLE is used, because then a single keepalive can "apply" to multiple > RTP streams. OK? > > Comments to text formulation and placement are welcome. > > Cheers, > /Bo > > > -----Original Message----- > > From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Christian > > Groves > > Sent: den 10 september 2014 02:20 > > To: avtext@ietf.org > > Subject: [avtext] RTP stream pause and keepalives > > > > Hello Bo, > > > > A colleague mentioned there might be an issue with regards to > > heartbeats keeping NAT resources open, i.e. as per clause 10/RFC5245 > > when an RTP stream is paused. We probably need to add some text to the > draft to indicate what happens when an RTP stream is paused. I take it that > normal media should be paused but that any RTP keepalive (e.g. > > comfort noise, No-Op or incorrect version) should still be transmitted. > > > > Regards, Christian > > > > _______________________________________________ > > avtext mailing list > > avtext@ietf.org > > https://www.ietf.org/mailman/listinfo/avtext > > _______________________________________________ > avtext mailing list > avtext@ietf.org > https://www.ietf.org/mailman/listinfo/avtext From nobody Wed Sep 10 04:08:01 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1E4D31A6F63 for ; Wed, 10 Sep 2014 04:07:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.601 X-Spam-Level: X-Spam-Status: No, score=-2.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eHaEbKQxjT6f for ; Wed, 10 Sep 2014 04:07:56 -0700 (PDT) Received: from sessmg22.ericsson.net (sessmg22.ericsson.net [193.180.251.58]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 459DD1A6F4C for ; Wed, 10 Sep 2014 04:07:55 -0700 (PDT) X-AuditID: c1b4fb3a-f79da6d0000008c7-6c-5410310952f4 Received: from ESESSHC018.ericsson.se (Unknown_Domain [153.88.253.124]) by sessmg22.ericsson.net (Symantec Mail Security) with SMTP id 60.12.02247.90130145; Wed, 10 Sep 2014 13:07:53 +0200 (CEST) Received: from ESESSMB105.ericsson.se ([169.254.5.215]) by ESESSHC018.ericsson.se ([153.88.183.72]) with mapi id 14.03.0174.001; Wed, 10 Sep 2014 13:07:53 +0200 From: Bo Burman To: Roni Even , 'Christian Groves' , "avtext@ietf.org" Thread-Topic: [avtext] RTP stream pause and keepalives Thread-Index: AQHPzI0E+Kr8YvHSDEqOcWX2GY8UVJv56rVQgAAGqACAAENYIA== Date: Wed, 10 Sep 2014 11:07:53 +0000 Message-ID: References: <540F9922.8060705@nteczone.com> <002801cfccd6$01337190$039a54b0$@gmail.com> In-Reply-To: <002801cfccd6$01337190$039a54b0$@gmail.com> Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.17] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrJLMWRmVeSWpSXmKPExsUyM+JvjS6noUCIwdWpxhYf791gtfjyvpHF 4m87swOzx85Zd9k9liz5yeSx4vxMlgDmKC6blNSczLLUIn27BK6M/v8v2QomyVUcmzCVvYHx nngXIyeHhICJRMeSf+wQtpjEhXvr2UBsIYGjjBJHb0h3MXIB2UsYJV7cug1WxCagITF/x11G kISIQCOjxIm/a8ASwgKmEr8X3gJKcAAlzCR2vOOGMJ0kHvywAalgEVCVODd1KSOIzSvgK3Hu 9ipGiPlzGSUetl5hBklwClhIfNz2DGwko4CsxP3v91hAbGYBcYlbT+YzQRwqILFkz3lmCFtU 4uXjf6wguyQEFCWW98tBlOtILNj9iQ3C1pZYtvA1M8ReQYmTM5+wTGAUnYVk6iwkLbOQtMxC 0rKAkWUVo2hxanFxbrqRkV5qUWZycXF+nl5easkmRmDcHNzy22oH48HnjocYBTgYlXh4F2zg DxFiTSwrrsw9xCjNwaIkzrvw3LxgIYH0xJLU7NTUgtSi+KLSnNTiQ4xMHJxSDYwbL26qttzb /8ThnKL36W1TfZtOvty6UX/alWJNZmdDQXXxemXd3e/s23ZEHP4vmBvZf+Mq77dSu6WHla1e x2v9bNbWnGn2qK/BlYPnw4JZD++uTJ1p1tYRIy1ctcUjr2i6pB+ndtt97aUWvz/yCt+905fK 2sgioNwocc5h8ekUy4n2zje3tSmxFGckGmoxFxUnAgBGNAvyfAIAAA== Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/xCYaJVHqRLF7uzRSTwu4k_JYA9A Subject: Re: [avtext] RTP stream pause and keepalives X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Sep 2014 11:07:59 -0000 Agree, 6263 seems more applicable to this very RTP-specific scope, but 6263= says it is specifically not applicable to ICE clients, so maybe there's no= harm in referencing both 6263 and 5245, since what keepalive method is use= d does not matter as long as it is not impacted by pause? > -----Original Message----- > From: Roni Even [mailto:ron.even.tlv@gmail.com] > Sent: den 10 september 2014 11:03 > To: Bo Burman; 'Christian Groves'; avtext@ietf.org > Subject: RE: [avtext] RTP stream pause and keepalives >=20 > Hi Bo, > I think the text you propose make sense. Wondering if we should reference > RFC6263 and not RFC 5245 >=20 > Roni >=20 > > -----Original Message----- > > From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bo Burman > > Sent: 10 September, 2014 10:35 AM > > To: Christian Groves; avtext@ietf.org > > Subject: Re: [avtext] RTP stream pause and keepalives > > > > Hi Christian, > > > > You are entirely right, the intent is that RTP stream pause does not > affect > > keepalive. I have no problem with adding some clarifying statement. > > > > I also think sec 10 / RFC 5242 text is pretty clear on this: "These > keepalives > > MUST be sent regardless of whether the media stream is currently > > inactive, sendonly, recvonly, or sendrecv...", and even "...keepalives > > MUST be sent > even > > if ICE is not being utilized for the session at all". I see RTP stream > pause as > > being even more "temporary" than setting a stream inactive, so a > > paused > RTP > > stream should definitely be "live" enough to make the above RFC 5245 > > statements apply. > > > > Do you think that a reference to RFC 5245 from the pause draft is > appropriate > > and sufficient? > > > > Tentative text, possibly after second clause of sec 6.3 ("Paused State"= ): > > "Pausing an RTP stream MUST NOT affect the sending of RTP keepalive > > [RFC5245] applicable to that RTP stream", as well as adding RFC 5245 > > as a normative reference. Is it correct to have it as a normative > > reference, > even if it > > is not mandated by this draft to actually implement RFC 5245, but just > > referencing it in a normative statement? > > > > I don't think that referencing RFC 5245 opens up to allowing RTP > > stream > pause > > affect "non-RFC 5245 keepalive", because the text in RFC 5245 seems > generic > > enough to cover any perceivable RTP keepalive procedure. Do you agree? > > > > I think including "applicable to that RTP stream" should also cover > > the > case > > when BUNDLE is used, because then a single keepalive can "apply" to > multiple > > RTP streams. OK? > > > > Comments to text formulation and placement are welcome. > > > > Cheers, > > /Bo > > > > > -----Original Message----- > > > From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Christian > > > Groves > > > Sent: den 10 september 2014 02:20 > > > To: avtext@ietf.org > > > Subject: [avtext] RTP stream pause and keepalives > > > > > > Hello Bo, > > > > > > A colleague mentioned there might be an issue with regards to > > > heartbeats keeping NAT resources open, i.e. as per clause 10/RFC5245 > > > when an RTP stream is paused. We probably need to add some text to > > > the > > draft to indicate what happens when an RTP stream is paused. I take it > that > > normal media should be paused but that any RTP keepalive (e.g. > > > comfort noise, No-Op or incorrect version) should still be transmitte= d. > > > > > > Regards, Christian > > > > > > _______________________________________________ > > > avtext mailing list > > > avtext@ietf.org > > > https://www.ietf.org/mailman/listinfo/avtext > > > > _______________________________________________ > > avtext mailing list > > avtext@ietf.org > > https://www.ietf.org/mailman/listinfo/avtext From nobody Wed Sep 10 15:04:19 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 705101A0201 for ; Wed, 10 Sep 2014 15:04:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IY0yoZ3eel3N for ; Wed, 10 Sep 2014 15:04:15 -0700 (PDT) Received: from mail-wi0-x233.google.com (mail-wi0-x233.google.com [IPv6:2a00:1450:400c:c05::233]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5C4551A01F9 for ; Wed, 10 Sep 2014 15:04:15 -0700 (PDT) Received: by mail-wi0-f179.google.com with SMTP id q5so7088392wiv.12 for ; Wed, 10 Sep 2014 15:04:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:references:in-reply-to:subject:date:message-id:mime-version :content-type:content-transfer-encoding:thread-index :content-language; bh=MViSWKiJXILUoOm2gxSsJj/qMhD0BPfbBANreJV03kU=; b=jBJ+UrJ/asbfY4GBR2OPJB92Z5PafobPqfMLxo/ZvLtRlF0aihkFlMYg5lUOhNpNL5 aPlfCPKmTG0pi7N4jedEjhblPWHTHC6oOHz1k7ZknF14ORskK03ilSfkhpZalUknP0e3 f4VMsBJ735kFi6hDthKA1uAc9ykUcUKjZj+yLe4U1Hfe7i7oinJib46YmBvSWThX3xGx cCom3yfYUTpPX01TrejSeQfU8NAeYR7yePjv8THUHQXIsDJK4emE0rxWqJhYfVEqEynB qO9HpZwzLIpUleWA3K7UlHvKu6W0CYbBnUtzT/PXdAWiitw6GH6Mxwadx8W0vCFH/zuW Ohrw== X-Received: by 10.180.86.33 with SMTP id m1mr2380759wiz.11.1410386653763; Wed, 10 Sep 2014 15:04:13 -0700 (PDT) Received: from RoniE (bzq-79-176-126-132.red.bezeqint.net. [79.176.126.132]) by mx.google.com with ESMTPSA id gk17sm3871272wic.16.2014.09.10.15.04.11 for (version=TLSv1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 10 Sep 2014 15:04:12 -0700 (PDT) From: "Roni Even" To: "'Bo Burman'" , "'Christian Groves'" , References: <540F9922.8060705@nteczone.com> <002801cfccd6$01337190$039a54b0$@gmail.com> In-Reply-To: Date: Thu, 11 Sep 2014 01:04:01 +0300 Message-ID: <008a01cfcd43$22676ca0$673645e0$@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQGQbTCXgpnCzptUQ9kRxVWtZA2kHAHso0CbAWGpSk4CtzhHX5xJf5pw Content-Language: en-us Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/4M0qbqEPzDui-jkxuNRLd53_nAs Subject: Re: [avtext] RTP stream pause and keepalives X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Sep 2014 22:04:17 -0000 Hi Bo, Agree Roni > -----Original Message----- > From: Bo Burman [mailto:bo.burman@ericsson.com] > Sent: 10 September, 2014 2:08 PM > To: Roni Even; 'Christian Groves'; avtext@ietf.org > Subject: RE: [avtext] RTP stream pause and keepalives > > Agree, 6263 seems more applicable to this very RTP-specific scope, but 6263 > says it is specifically not applicable to ICE clients, so maybe there's no harm in > referencing both 6263 and 5245, since what keepalive method is used does not > matter as long as it is not impacted by pause? > > > -----Original Message----- > > From: Roni Even [mailto:ron.even.tlv@gmail.com] > > Sent: den 10 september 2014 11:03 > > To: Bo Burman; 'Christian Groves'; avtext@ietf.org > > Subject: RE: [avtext] RTP stream pause and keepalives > > > > Hi Bo, > > I think the text you propose make sense. Wondering if we should > > reference > > RFC6263 and not RFC 5245 > > > > Roni > > > > > -----Original Message----- > > > From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bo Burman > > > Sent: 10 September, 2014 10:35 AM > > > To: Christian Groves; avtext@ietf.org > > > Subject: Re: [avtext] RTP stream pause and keepalives > > > > > > Hi Christian, > > > > > > You are entirely right, the intent is that RTP stream pause does not > > affect > > > keepalive. I have no problem with adding some clarifying statement. > > > > > > I also think sec 10 / RFC 5242 text is pretty clear on this: "These > > keepalives > > > MUST be sent regardless of whether the media stream is currently > > > inactive, sendonly, recvonly, or sendrecv...", and even > > > "...keepalives MUST be sent > > even > > > if ICE is not being utilized for the session at all". I see RTP > > > stream > > pause as > > > being even more "temporary" than setting a stream inactive, so a > > > paused > > RTP > > > stream should definitely be "live" enough to make the above RFC 5245 > > > statements apply. > > > > > > Do you think that a reference to RFC 5245 from the pause draft is > > appropriate > > > and sufficient? > > > > > > Tentative text, possibly after second clause of sec 6.3 ("Paused State"): > > > "Pausing an RTP stream MUST NOT affect the sending of RTP keepalive > > > [RFC5245] applicable to that RTP stream", as well as adding RFC 5245 > > > as a normative reference. Is it correct to have it as a normative > > > reference, > > even if it > > > is not mandated by this draft to actually implement RFC 5245, but > > > just referencing it in a normative statement? > > > > > > I don't think that referencing RFC 5245 opens up to allowing RTP > > > stream > > pause > > > affect "non-RFC 5245 keepalive", because the text in RFC 5245 seems > > generic > > > enough to cover any perceivable RTP keepalive procedure. Do you agree? > > > > > > I think including "applicable to that RTP stream" should also cover > > > the > > case > > > when BUNDLE is used, because then a single keepalive can "apply" to > > multiple > > > RTP streams. OK? > > > > > > Comments to text formulation and placement are welcome. > > > > > > Cheers, > > > /Bo > > > > > > > -----Original Message----- > > > > From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of > > > > Christian Groves > > > > Sent: den 10 september 2014 02:20 > > > > To: avtext@ietf.org > > > > Subject: [avtext] RTP stream pause and keepalives > > > > > > > > Hello Bo, > > > > > > > > A colleague mentioned there might be an issue with regards to > > > > heartbeats keeping NAT resources open, i.e. as per clause > > > > 10/RFC5245 when an RTP stream is paused. We probably need to add > > > > some text to the > > > draft to indicate what happens when an RTP stream is paused. I take > > > it > > that > > > normal media should be paused but that any RTP keepalive (e.g. > > > > comfort noise, No-Op or incorrect version) should still be transmitted. > > > > > > > > Regards, Christian > > > > > > > > _______________________________________________ > > > > avtext mailing list > > > > avtext@ietf.org > > > > https://www.ietf.org/mailman/listinfo/avtext > > > > > > _______________________________________________ > > > avtext mailing list > > > avtext@ietf.org > > > https://www.ietf.org/mailman/listinfo/avtext From nobody Wed Sep 10 16:27:43 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 797BF1A03B7 for ; Wed, 10 Sep 2014 16:27:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JpzVxFCD1K4s for ; Wed, 10 Sep 2014 16:27:36 -0700 (PDT) Received: from cserver5.myshophosting.com (cserver5.myshophosting.com [175.107.161.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1B5D41A03A8 for ; Wed, 10 Sep 2014 16:27:35 -0700 (PDT) Received: from ppp118-209-40-238.lns20.mel4.internode.on.net ([118.209.40.238]:49739 helo=[127.0.0.1]) by cserver5.myshophosting.com with esmtpsa (TLSv1:DHE-RSA-AES128-SHA:128) (Exim 4.82) (envelope-from ) id 1XRrHy-0005g6-D8; Thu, 11 Sep 2014 09:27:02 +1000 Message-ID: <5410DE51.4030602@nteczone.com> Date: Thu, 11 Sep 2014 09:27:13 +1000 From: Christian Groves User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Roni Even , 'Bo Burman' , avtext@ietf.org References: <540F9922.8060705@nteczone.com> <002801cfccd6$01337190$039a54b0$@gmail.com> <008a01cfcd43$22676ca0$673645e0$@gmail.com> In-Reply-To: <008a01cfcd43$22676ca0$673645e0$@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cserver5.myshophosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - nteczone.com X-Get-Message-Sender-Via: cserver5.myshophosting.com: authenticated_id: christian.groves@nteczone.com X-Source: X-Source-Args: X-Source-Dir: Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/Hnd6hKyZvikh9RWNN8NDESOdk_g Subject: Re: [avtext] RTP stream pause and keepalives X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Sep 2014 23:27:41 -0000 Hello Bo, Sounds good to me also. Regards, Christian On 11/09/2014 8:04 AM, Roni Even wrote: > Hi Bo, > Agree > Roni > >> -----Original Message----- >> From: Bo Burman [mailto:bo.burman@ericsson.com] >> Sent: 10 September, 2014 2:08 PM >> To: Roni Even; 'Christian Groves'; avtext@ietf.org >> Subject: RE: [avtext] RTP stream pause and keepalives >> >> Agree, 6263 seems more applicable to this very RTP-specific scope, but > 6263 >> says it is specifically not applicable to ICE clients, so maybe there's no > harm in >> referencing both 6263 and 5245, since what keepalive method is used does > not >> matter as long as it is not impacted by pause? >> >>> -----Original Message----- >>> From: Roni Even [mailto:ron.even.tlv@gmail.com] >>> Sent: den 10 september 2014 11:03 >>> To: Bo Burman; 'Christian Groves'; avtext@ietf.org >>> Subject: RE: [avtext] RTP stream pause and keepalives >>> >>> Hi Bo, >>> I think the text you propose make sense. Wondering if we should >>> reference >>> RFC6263 and not RFC 5245 >>> >>> Roni >>> >>>> -----Original Message----- >>>> From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bo Burman >>>> Sent: 10 September, 2014 10:35 AM >>>> To: Christian Groves; avtext@ietf.org >>>> Subject: Re: [avtext] RTP stream pause and keepalives >>>> >>>> Hi Christian, >>>> >>>> You are entirely right, the intent is that RTP stream pause does not >>> affect >>>> keepalive. I have no problem with adding some clarifying statement. >>>> >>>> I also think sec 10 / RFC 5242 text is pretty clear on this: "These >>> keepalives >>>> MUST be sent regardless of whether the media stream is currently >>>> inactive, sendonly, recvonly, or sendrecv...", and even >>>> "...keepalives MUST be sent >>> even >>>> if ICE is not being utilized for the session at all". I see RTP >>>> stream >>> pause as >>>> being even more "temporary" than setting a stream inactive, so a >>>> paused >>> RTP >>>> stream should definitely be "live" enough to make the above RFC 5245 >>>> statements apply. >>>> >>>> Do you think that a reference to RFC 5245 from the pause draft is >>> appropriate >>>> and sufficient? >>>> >>>> Tentative text, possibly after second clause of sec 6.3 ("Paused > State"): >>>> "Pausing an RTP stream MUST NOT affect the sending of RTP keepalive >>>> [RFC5245] applicable to that RTP stream", as well as adding RFC 5245 >>>> as a normative reference. Is it correct to have it as a normative >>>> reference, >>> even if it >>>> is not mandated by this draft to actually implement RFC 5245, but >>>> just referencing it in a normative statement? >>>> >>>> I don't think that referencing RFC 5245 opens up to allowing RTP >>>> stream >>> pause >>>> affect "non-RFC 5245 keepalive", because the text in RFC 5245 seems >>> generic >>>> enough to cover any perceivable RTP keepalive procedure. Do you agree? >>>> >>>> I think including "applicable to that RTP stream" should also cover >>>> the >>> case >>>> when BUNDLE is used, because then a single keepalive can "apply" to >>> multiple >>>> RTP streams. OK? >>>> >>>> Comments to text formulation and placement are welcome. >>>> >>>> Cheers, >>>> /Bo >>>> >>>>> -----Original Message----- >>>>> From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of >>>>> Christian Groves >>>>> Sent: den 10 september 2014 02:20 >>>>> To: avtext@ietf.org >>>>> Subject: [avtext] RTP stream pause and keepalives >>>>> >>>>> Hello Bo, >>>>> >>>>> A colleague mentioned there might be an issue with regards to >>>>> heartbeats keeping NAT resources open, i.e. as per clause >>>>> 10/RFC5245 when an RTP stream is paused. We probably need to add >>>>> some text to the >>>> draft to indicate what happens when an RTP stream is paused. I take >>>> it >>> that >>>> normal media should be paused but that any RTP keepalive (e.g. >>>>> comfort noise, No-Op or incorrect version) should still be > transmitted. >>>>> Regards, Christian >>>>> >>>>> _______________________________________________ >>>>> avtext mailing list >>>>> avtext@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/avtext >>>> _______________________________________________ >>>> avtext mailing list >>>> avtext@ietf.org >>>> https://www.ietf.org/mailman/listinfo/avtext > From nobody Mon Sep 15 07:30:10 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 62F661A0369 for ; Mon, 15 Sep 2014 07:30:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 4.909 X-Spam-Level: **** X-Spam-Status: No, score=4.909 tagged_above=-999 required=5 tests=[BAYES_50=0.8, J_CHICKENPOX_12=0.6, J_CHICKENPOX_15=0.6, J_CHICKENPOX_17=0.6, J_CHICKENPOX_38=0.6, J_CHICKENPOX_45=0.6, J_CHICKENPOX_46=0.6, J_CHICKENPOX_51=0.6, J_CHICKENPOX_61=0.6, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_FILL_THIS_FORM_SHORT=0.01] autolearn=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UJLSsc-rGcqI for ; Mon, 15 Sep 2014 07:29:54 -0700 (PDT) Received: from sessmg22.ericsson.net (sessmg22.ericsson.net [193.180.251.58]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6FBD31A0339 for ; Mon, 15 Sep 2014 07:29:52 -0700 (PDT) X-AuditID: c1b4fb3a-f79da6d0000008c7-4b-5416f7de17b0 Received: from ESESSHC015.ericsson.se (Unknown_Domain [153.88.253.124]) by sessmg22.ericsson.net (Symantec Mail Security) with SMTP id 6A.F8.02247.ED7F6145; Mon, 15 Sep 2014 16:29:50 +0200 (CEST) Received: from ESESSMB105.ericsson.se ([169.254.5.215]) by ESESSHC015.ericsson.se ([153.88.183.63]) with mapi id 14.03.0174.001; Mon, 15 Sep 2014 16:29:49 +0200 From: Bo Burman To: Bo Burman , Christian Groves , "avtext@ietf.org" Thread-Topic: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 Thread-Index: Ac+oI8943NA5z66dRdGqdkJ2oCY7RQSn2IaAAC2sUTAALZTUgABGai2QARodEgABAng3IAAejgIAAIUmrNACKTUMMA== Date: Mon, 15 Sep 2014 14:29:49 +0000 Message-ID: References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com> <53F1DD5D.6030204@nteczone.com> <53F441C3.5050201@nteczone.com> <53FD7F8A.6060608@nteczone.com> <54051326.5090103@nteczone.com> In-Reply-To: Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.147] Content-Type: multipart/mixed; boundary="_002_BBE9739C2C302046BD34B42713A1E2A22E2CD82AESESSMB105erics_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprEIsWRmVeSWpSXmKPExsUyM+Jvje6972IhBvfXKFl8vHeD1eLL+0YW ByaPJUt+MnmsOD+TJYApissmJTUnsyy1SN8ugSvjzP1+xoLedq6Khv4n7A2MP69wdjFycEgI mEhsuOHUxcgJZIpJXLi3nq2LkYtDSOAoo8TCu7OZIZwljBLf97WxgFSxCWhIzN9xlxHEFhGo l/h+fA07iC0s4Cox9dE9Zoi4m8SvOzvZIOwsib7FrWD1LAKqEuf6F7KALOYV8JVYcagSYv4n ZomdDzeA9XIK+Enc2XkCbBejgKzE/e/3wGxmAXGJW0/mM0FcKiLx8OJpNghbVOLl43+sEM8o SUzbmgZRnimx6cM+sFZeAUGJkzOfsExgFJmFZNIsJGWzkJRBxHUkFuz+xAZha0ssW/iaGcIO ljjysoFxFtA2ZqCPV7e4zgL6gFngIqPEru6HUPWKElO6H7IvYORcxShanFpcnJtuZKSXWpSZ XFycn6eXl1qyiREYiQe3/LbawXjwueMhRgEORiUe3gU7xEKEWBPLiitzDzFKc7AoifMuPDcv WEggPbEkNTs1tSC1KL6oNCe1+BAjEwenVAOj5F7taKMLnj01rr2vz7r67nhy5tXU6tzLjcbJ 0/Z9S+nUZ3JZOylz7vo5syoFHv+9/eLBguJDF+NKD80OmHBt+t29Ry9rvHLSTu2f0GQr7T97 dW9E9392A53WSM6l+XNSeto7uj7oFX5eHnlt7tX82933am41/c5amsp3oluDO33qbdfvd0L/ K7EUZyQaajEXFScCAHR1dP+lAgAA Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/pmcTH4bE7mTTrrXYaLHkbz8RAv8 Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 15 Sep 2014 14:30:06 -0000 --_002_BBE9739C2C302046BD34B42713A1E2A22E2CD82AESESSMB105erics_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Christian, Roni, all, Please find enclosed a draft update implementing Christian's suggested chan= ges below. Affected sections are 9 and 10.1. Please have a look and let me know if the changes are acceptable and consis= tent with our discussions. Cheers, /Bo > -----Original Message----- > From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bo Burman > Sent: den 5 september 2014 11:44 > To: Christian Groves; avtext@ietf.org > Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 >=20 > Hi Christian, >=20 > More inline. >=20 > As a summary, I must conclude that Christian's proposal has consistency a= nd clarity benefits in SDP signaling compared to > what is currently in the text, and suggest that the text should be change= d accordingly: >=20 > * The "dir" parameter of "ccm pause" is replaced by "config" as suggested= below. > * The separate "ccm paused" parameter is removed, since support of PAUSED= will instead be indicated through "config" >=20 > BR > /Bo >=20 > > -----Original Message----- > > From: Christian Groves [mailto:Christian.Groves@nteczone.com] > > Sent: den 2 september 2014 02:45 > > To: Bo Burman; avtext@ietf.org > > Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 > > > > Hello Bo, > > > > Please see my replies below. > > > > Regards, Christian > > > > On 1/09/2014 9:51 PM, Bo Burman wrote: > > > ..snip.. > > > I think the following two main options are reasonable ways forward: > > > > > > 1) Remove the "paused" SDP parameter entirely, and with it the > > > possibility to implement support of only the local pause indication > > > > > > 2) Make the text consistently express that "paused" refers to > > > capability for that limited functionality. For SDP > > >> offer/answer, we then have a few more choices regarding the relation= between "pause" and "paused": > > >>> a) an offer expressing support for this specification MUST > > >>> contain only one of "pause" or "paused", and an offer > > >> with "pause" is possible to restrict by answering with "paused", > > >> but an offer with the limited "paused" cannot be upgraded to > > >> "pause" in the answer. May possibly cause problems with > > declarative use; guidance appreciated. > > >>> b) "pause" and "paused" are kept separate (what current text > > >>> mostly does, except for some confusion that must be corrected > > >>> throughout if this option is chosen); the offer MAY contain either > > >>> or both, while the answer MUST choose one and MUST NOT add > > >>> anything that was not in the offer > > >> [CNG] I wasn't following this closely when 'paused' was added so > > >> I'm not sure about removing it. It would simplify things if it was r= emoved. > > >> I think what would need to be added if local pause was supported > > >> without signalling is that a node supporting this draft must at > > >> minimum support the reception of a 'paused' indication and the > > >> sending of 'paused' if the node supports a paused state. There > > >> would probably need to be an extra value in direction > > indicating that PAUSE/RESUME is not sent or received. > > > [BoB] You mean using additional direction signaling for pause > > > instead of the tag "paused"? I don't see how that goes > > with your statement "supported without signaling" a few sentences back,= since that is then also explicit signaling? > > [CNG] Yes an additional direction. I was thinking about how to specify > > "local pause" where the endpoint didn't support sendonly,recvonly or > > sendrecv. It wouldn't be correct for the endpoint to send "a=3Drtcp-fb:= * ccm pause" because the default is "sendrecv". >=20 > [BoB] Thinking this through again. It is possible to make the currently p= roposed signaling in the draft consistent, but only > if capability and indication of pause and local pause are changed to be t= otally independent functions. The 8 configurations > you list are then possible to express, using direction parameter of both = pause and paused ([] indicates optional). >=20 > 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive (PAUSED,RESUMED,PAUSED,REFUS= ED) > a=3Drtcp-fb:* ccm pause [dir=3Dsendrecv] > a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] >=20 > 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) > a=3Drtcp-fb:* ccm pause dir=3Dsendonly > a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] >=20 > 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) > a=3Drtcp-fb:* ccm pause dir=3Drecvonly > a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] >=20 > 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) > a=3Drtcp-fb:* ccm pause dir=3Drecvonly > a=3Drtcp-fb:* ccm paused dir=3Dsendonly >=20 > 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) > a=3Drtcp-fb:* ccm pause dir=3Dsendonly > a=3Drtcp-fb:* ccm paused dir=3Drecvonly >=20 > 6) Send(PAUSED) Receive(PAUSED) > a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] >=20 > 7) Send() Receive(PAUSED) > a=3Drtcp-fb:* ccm paused dir=3Drecvonly >=20 > 8) Send(PAUSED) Receive() > a=3Drtcp-fb:* ccm paused dir=3Dsendonly >=20 > That split would however also mean there is a possibility to support PAUS= E but not PAUSED, which I believe is an > undesirable side-effect and definitely not in line with the current text. >=20 > As a summary, I must agree that your proposal to use a "config" parameter= with an explicit listing of supported messages > and directions is indeed much easier to describe and is beneficial for te= xt clarity. >=20 > > > > > >> Maybe an option 2c: If local pause is kept and it needs to be > > >> supported by signalling there actually appears to be 8 combinations > > >> of sent and received messages. I assume a node supporting the > > >> sending and/or reception of PAUSE must also support RESUME. A node > > >> supporting the reception of PAUSE/RESUME must also > > support sending PAUSED and REFUSED. > > > [BoB] An observation: I see you more or less consistently using > > > "REFUSED" instead of the currently defined tag > > "REFUSE". This is actually consistent with it being an > > indication/response rather than a command, and thus probably a better n= ame. Do you suggest that we change the > name to "REFUSED" in the draft? > > [CNG] I wasn't proposing the change, I guess I just aligned "paused" an= d "refused". I'd be OK with changing it. > [BoB] Unless someone else objects, I will change REFUSE to REFUSED throug= hout, to better reflect that it is an indication, > not a command. >=20 > > > > > >> The combinations a Node can support are: > > >> > > >> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive > > >> (PAUSED,RESUMED,PAUSED,REFUSED) > > >> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) > > >> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) > > >> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) > > >> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) > > >> 6) Send(PAUSED) Receive(PAUSED) > > >> 7) Send() Receive(PAUSED) > > >> 8) Send(PAUSED) Receive() > > >> > > >> Would it be easier to simply signal the messages that are supported > > >> rather than two parameters with a direction parameters? e.g. the > > >> draft could have the above list of values. If a node supported both > > >> the sending and reception of PAUSE/RESUME/PAUSED/REFUSED then it > > >> could signal e.g. a=3Drtcp-fb:98 ccm pause > > config=3D1 . Part of the confusion comes from the interaction between t= he parameters. This would remove the > interaction. > > >> > > >> It might make describing the SDP O/A procedures easier. > > >> e.g. > > >> On receiving an Offer with: > > >> config=3D1 the answerer may reply with config=3D1, 2, 3, 4, 5, 6, 7 = or 8. > > >> config=3D2 the answerer may reply with config=3D3, 4, 5, 6, 7 or 8. > > >> config=3D3 the answerer may reply with config=3D2, 4, 5, 6, 7 or 8. > > >> config=3D4 the answerer may reply with config=3D5, 6, 7 or 8. > > >> config=3D5 the answerer may reply with config=3D4, 6, 7 or 8. > > >> config=3D6 the answerer may reply with config=3D6, 7 or 8. > > >> config=3D7 the answerer may reply with config=3D8 > > >> config=3D8 the answerer may reply with config=3D7 In all cases the > > >> answerer may reply with a completely removed "pause" > > >> parameter. > > >> > > >> An answerer cannot add extra messages to what is provided in the Off= er. > > >> For example: If an Offer indicates config=3D6 an Answer cannot reply > > >> with > > >> config=3D3 indicating that it has the capability to receive PAUSE an= d > > >> RESUME. An answerer may remove messages that it does not support. > > >> For > > >> example: if an Offer indicates config=3D6 an Answer may reply with > > >> config=3D7 indicating that it can only receive PAUSED. > > > [BoB] I get your point. There is significant inherent complexity in > > > this that your proposal makes explicit and clarifies. I > > would like to simplify and clarify this further by reducing the allowed= configurations to be 1, 4, 5 and 6: > > > > > > 1) Full support of sending and receiving all messages ("ccm pause" wi= thout direction) > > > As you say above, acceptable Answers include 1, 4, 5 or 6, or (of > > > course) removing "ccm pause" entirely > > > 4) Pause command receiver, sending result indications ("ccm pause dir= =3Drecvonly") > > > Acceptable Answers include 5, 6, or removing ccm pause entirely > > > 5) Pause command sender, receiving result indications ("ccm pause dir= =3Dsendonly") > > > Acceptable Answers include 4, 6, or removing ccm pause entirely > > > 6) Local pause support only ("ccm paused", and I then suggest > > > removing direction from paused; either you support it or > > you don't) > > > Acceptable Answers include 6 or removing ccm paused entirely > > [CNG] So to remove 2 and 3 the assumption must be that local pause is > > not supported by a sendonly or receive only endpoint. Is that correct? > > It would seem that if local pause was to be supported then 2 and 3 shou= ld be selected rather than 4 and 5. > > To remove 7 and 8 the assumption must be that endpoints > > supporting this draft must support local pause? Otherwise there's no wa= y of saying "I won't send anything but if you do > a local pause let me know". >=20 > [BoB] I agree the 8 configurations you list makes sense to keep. They ref= lect the current text better than what I > suggested. >=20 > > > If those clarifications you list above on O/A and what messages are > > > sent and/or received are made in the document, do > > you still think we need to introduce the "config" concept, or will the > > direction parameter to "pause" (as indicated in my shortened list above= ) be clear enough? > > [CNG] I think having "paused" as a separate parameter as in your > > proposal 6 just complicates things. Once you have two parameters then w= e come back to specifying the interaction > between them. E.g. If A sends SDP "a=3Drtcp-fb:* ccm pause" > > if B only supports local pause does it reply back with a different > > parameter "a=3Drtcp-fb* ccm paused"? If so then it wouldn't make sense = for an endpoint to send both "pause" and > "paused". >=20 > [BoB] As said above, just signaling ccm pause would have to mean that pau= sed is not supported, so there would be no > way to fall back to local pause, which is undesirable. Your "config" is b= etter. >=20 > > > > > > I wonder, is it rather the notion of "direction" that becomes > > > confusing, since "recvonly" actually includes sending > > messages, only those messages are not "PAUSE" and "RESUME"? In that > > case, could we call it something else than "direction"; like "dir=3Dsen= donly" -> "command-only" and "dir=3Drecvonly" -> > "indication-only"? > > [CNG] Yes I think the direction is confusing considering that for > > pause it's opposite the RTP flow direction, for paused its the same. To= support pause an endpoint will send and receive > messages. I don't think "command-only"/"indication-only" > > help because they again relate to a direction. e.g. to support > > "sendonly" an endpoint sends commands PAUSE/RESUME and receives indicat= ions PAUSED/REFUSEd. I think being > explicit makes the description much easier. > [BoB] Agree >=20 > _______________________________________________ > avtext mailing list > avtext@ietf.org > https://www.ietf.org/mailman/listinfo/avtext --_002_BBE9739C2C302046BD34B42713A1E2A22E2CD82AESESSMB105erics_ Content-Type: text/plain; name="draft-ietf-avtext-rtp-stream-pause-03-DRAFT1.txt" Content-Description: draft-ietf-avtext-rtp-stream-pause-03-DRAFT1.txt Content-Disposition: attachment; filename="draft-ietf-avtext-rtp-stream-pause-03-DRAFT1.txt"; size=110762; creation-date="Mon, 15 Sep 2014 14:17:35 GMT"; modification-date="Mon, 15 Sep 2014 14:17:35 GMT" Content-Transfer-Encoding: base64 DQoNCg0KDQpOZXR3b3JrIFdvcmtpbmcgR3JvdXAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICBCLiBCdXJtYW4NCkludGVybmV0LURyYWZ0ICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICBBLiBBa3JhbQ0KVXBkYXRlczogNTEwNCAo aWYgYXBwcm92ZWQpICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIEVyaWNzc29u 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Cg0KDQoNCg0KDQoNCg0KDQoNCg0KDQoNCg0KDQoNCg0KDQoNCg0KDQoNCg0KDQoNCg0KQnVybWFu LCBldCBhbC4gICAgICAgICAgIEV4cGlyZXMgTWFyY2ggMTksIDIwMTUgICAgICAgICAgICAgICAg W1BhZ2UgNDZdDQo= --_002_BBE9739C2C302046BD34B42713A1E2A22E2CD82AESESSMB105erics_-- From nobody Mon Sep 15 20:14:23 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AFD041A020B for ; Mon, 15 Sep 2014 20:14:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.1 X-Spam-Level: X-Spam-Status: No, score=-0.1 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, J_CHICKENPOX_38=0.6, J_CHICKENPOX_45=0.6, J_CHICKENPOX_46=0.6] autolearn=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vO77tcxxAtvI for ; Mon, 15 Sep 2014 20:14:17 -0700 (PDT) Received: from cserver5.myshophosting.com (cserver5.myshophosting.com [175.107.161.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E44B71A0199 for ; Mon, 15 Sep 2014 20:14:16 -0700 (PDT) Received: from ppp118-209-111-109.lns20.mel4.internode.on.net ([118.209.111.109]:54449 helo=[127.0.0.1]) by cserver5.myshophosting.com with esmtpsa (TLSv1:DHE-RSA-AES128-SHA:128) (Exim 4.82) (envelope-from ) id 1XTjBx-0008Jw-TF; Tue, 16 Sep 2014 13:12:34 +1000 Message-ID: <5417AB01.2010801@nteczone.com> Date: Tue, 16 Sep 2014 13:14:09 +1000 From: Christian Groves User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Bo Burman , "avtext@ietf.org" References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com> <53F1DD5D.6030204@nteczone.com> <53F441C3.5050201@nteczone.com> <53FD7F8A.6060608@nteczone.com> <54051326.5090103@nteczone.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cserver5.myshophosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - nteczone.com X-Get-Message-Sender-Via: cserver5.myshophosting.com: authenticated_id: christian.groves@nteczone.com X-Source: X-Source-Args: X-Source-Dir: Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/CPYl9jo32eeoMqFSc79s3kdxdhk Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Sep 2014 03:14:21 -0000 Hello Bo, Thanks for the updates. A few comments: 1) Cl.6.3: Text was added to the Paused state regarding keepalives. Do we also need that text in clause 6.4 on local paused state? 2) Cl.2.2: The term "REFUSED notification" is used but elsewhere "REFUSED indication" is used. 3) Cl.9 Para.1: With respect to the use of the rtcp-fb attribute I think the text should say "/MUST only be used as an SDP media attribute and MUST NOT be provided at the session level/". The use of "Recommended" implies an option however there's a must against the use at session level, so really there is no option. 4) General Nit: Sometimes "hold off period" is used, sometimes "hold off time" is used. Could be consistent. 5) Cl.9 Config value 5: " /streams it sends. It will send PAUSED and REFUSED as needed. It does not support pausing received RTP streams, and thus does not send any PAUSE and RESUME requests/ ". Could we modify it to read "/It does not support sending PAUSE and RESUME requests to pause received RTP streams.../"? It makes it clearer that the draft is talking about a sending action rather than a local pause. 6) Cl.9 last para pg 28: "/All implementations of this specification MUST be able to receive all// // messages defined in Section 8/". Given that the config parameter allows partial implementation then this statement isn't true. 7) Cl.9 Fig.7: I'm not sure if "1"-"8" is valid range syntax for ABNF? Cl.3.4/RFC5234 seems to imply that: pause-config-value = %x31-38 would be equivalent to "1" / "2" / "3" / "4" / "5" / "6" / "7" / "8". Also rather than having to enforce a once only usage for nowait and config could the ABNF be updated to make sure, e.g. rtcp-fb-ccm-param =/ SP "pause" [SP pause-config] [SP "nowait"] With respect to the extension token, the current form wouldn't allow something like foo=bar in the future as "=" isn't a token character. Firstly is it needed? if so then would something like [SP byte-string] be more appropriate? 8) Cl.9.2: " /First, the "config" attribute and its message directions are// // interpreted based on the node receiving the SDP./" Should this be the node "providing" the SDP as per cl.9.1? 9) Cl.11: Does the config parameter need to be included here? Also perhaps 4) and 5) should say "pause feedback type" as per the description of the "type" element. Regards, Christian On 16/09/2014 12:29 AM, Bo Burman wrote: > Christian, Roni, all, > > Please find enclosed a draft update implementing Christian's suggested changes below. Affected sections are 9 and 10.1. > Please have a look and let me know if the changes are acceptable and consistent with our discussions. > > Cheers, > /Bo > >> -----Original Message----- >> From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bo Burman >> Sent: den 5 september 2014 11:44 >> To: Christian Groves; avtext@ietf.org >> Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 >> >> Hi Christian, >> >> More inline. >> >> As a summary, I must conclude that Christian's proposal has consistency and clarity benefits in SDP signaling compared to >> what is currently in the text, and suggest that the text should be changed accordingly: >> >> * The "dir" parameter of "ccm pause" is replaced by "config" as suggested below. >> * The separate "ccm paused" parameter is removed, since support of PAUSED will instead be indicated through "config" >> >> BR >> /Bo >> >>> -----Original Message----- >>> From: Christian Groves [mailto:Christian.Groves@nteczone.com] >>> Sent: den 2 september 2014 02:45 >>> To: Bo Burman; avtext@ietf.org >>> Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 >>> >>> Hello Bo, >>> >>> Please see my replies below. >>> >>> Regards, Christian >>> >>> On 1/09/2014 9:51 PM, Bo Burman wrote: >>>> ..snip.. >>>> I think the following two main options are reasonable ways forward: >>>> >>>> 1) Remove the "paused" SDP parameter entirely, and with it the >>>> possibility to implement support of only the local pause indication >>>> >>>> 2) Make the text consistently express that "paused" refers to >>>> capability for that limited functionality. For SDP >>>>> offer/answer, we then have a few more choices regarding the relation between "pause" and "paused": >>>>>> a) an offer expressing support for this specification MUST >>>>>> contain only one of "pause" or "paused", and an offer >>>>> with "pause" is possible to restrict by answering with "paused", >>>>> but an offer with the limited "paused" cannot be upgraded to >>>>> "pause" in the answer. May possibly cause problems with >>> declarative use; guidance appreciated. >>>>>> b) "pause" and "paused" are kept separate (what current text >>>>>> mostly does, except for some confusion that must be corrected >>>>>> throughout if this option is chosen); the offer MAY contain either >>>>>> or both, while the answer MUST choose one and MUST NOT add >>>>>> anything that was not in the offer >>>>> [CNG] I wasn't following this closely when 'paused' was added so >>>>> I'm not sure about removing it. It would simplify things if it was removed. >>>>> I think what would need to be added if local pause was supported >>>>> without signalling is that a node supporting this draft must at >>>>> minimum support the reception of a 'paused' indication and the >>>>> sending of 'paused' if the node supports a paused state. There >>>>> would probably need to be an extra value in direction >>> indicating that PAUSE/RESUME is not sent or received. >>>> [BoB] You mean using additional direction signaling for pause >>>> instead of the tag "paused"? I don't see how that goes >>> with your statement "supported without signaling" a few sentences back, since that is then also explicit signaling? >>> [CNG] Yes an additional direction. I was thinking about how to specify >>> "local pause" where the endpoint didn't support sendonly,recvonly or >>> sendrecv. It wouldn't be correct for the endpoint to send "a=rtcp-fb:* ccm pause" because the default is "sendrecv". >> [BoB] Thinking this through again. It is possible to make the currently proposed signaling in the draft consistent, but only >> if capability and indication of pause and local pause are changed to be totally independent functions. The 8 configurations >> you list are then possible to express, using direction parameter of both pause and paused ([] indicates optional). >> >> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive (PAUSED,RESUMED,PAUSED,REFUSED) >> a=rtcp-fb:* ccm pause [dir=sendrecv] >> a=rtcp-fb:* ccm paused [dir=sendrecv] >> >> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) >> a=rtcp-fb:* ccm pause dir=sendonly >> a=rtcp-fb:* ccm paused [dir=sendrecv] >> >> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) >> a=rtcp-fb:* ccm pause dir=recvonly >> a=rtcp-fb:* ccm paused [dir=sendrecv] >> >> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) >> a=rtcp-fb:* ccm pause dir=recvonly >> a=rtcp-fb:* ccm paused dir=sendonly >> >> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) >> a=rtcp-fb:* ccm pause dir=sendonly >> a=rtcp-fb:* ccm paused dir=recvonly >> >> 6) Send(PAUSED) Receive(PAUSED) >> a=rtcp-fb:* ccm paused [dir=sendrecv] >> >> 7) Send() Receive(PAUSED) >> a=rtcp-fb:* ccm paused dir=recvonly >> >> 8) Send(PAUSED) Receive() >> a=rtcp-fb:* ccm paused dir=sendonly >> >> That split would however also mean there is a possibility to support PAUSE but not PAUSED, which I believe is an >> undesirable side-effect and definitely not in line with the current text. >> >> As a summary, I must agree that your proposal to use a "config" parameter with an explicit listing of supported messages >> and directions is indeed much easier to describe and is beneficial for text clarity. >> >>>>> Maybe an option 2c: If local pause is kept and it needs to be >>>>> supported by signalling there actually appears to be 8 combinations >>>>> of sent and received messages. I assume a node supporting the >>>>> sending and/or reception of PAUSE must also support RESUME. A node >>>>> supporting the reception of PAUSE/RESUME must also >>> support sending PAUSED and REFUSED. >>>> [BoB] An observation: I see you more or less consistently using >>>> "REFUSED" instead of the currently defined tag >>> "REFUSE". This is actually consistent with it being an >>> indication/response rather than a command, and thus probably a better name. Do you suggest that we change the >> name to "REFUSED" in the draft? >>> [CNG] I wasn't proposing the change, I guess I just aligned "paused" and "refused". I'd be OK with changing it. >> [BoB] Unless someone else objects, I will change REFUSE to REFUSED throughout, to better reflect that it is an indication, >> not a command. >> >>>>> The combinations a Node can support are: >>>>> >>>>> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive >>>>> (PAUSED,RESUMED,PAUSED,REFUSED) >>>>> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) >>>>> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) >>>>> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) >>>>> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) >>>>> 6) Send(PAUSED) Receive(PAUSED) >>>>> 7) Send() Receive(PAUSED) >>>>> 8) Send(PAUSED) Receive() >>>>> >>>>> Would it be easier to simply signal the messages that are supported >>>>> rather than two parameters with a direction parameters? e.g. the >>>>> draft could have the above list of values. If a node supported both >>>>> the sending and reception of PAUSE/RESUME/PAUSED/REFUSED then it >>>>> could signal e.g. a=rtcp-fb:98 ccm pause >>> config=1 . Part of the confusion comes from the interaction between the parameters. This would remove the >> interaction. >>>>> It might make describing the SDP O/A procedures easier. >>>>> e.g. >>>>> On receiving an Offer with: >>>>> config=1 the answerer may reply with config=1, 2, 3, 4, 5, 6, 7 or 8. >>>>> config=2 the answerer may reply with config=3, 4, 5, 6, 7 or 8. >>>>> config=3 the answerer may reply with config=2, 4, 5, 6, 7 or 8. >>>>> config=4 the answerer may reply with config=5, 6, 7 or 8. >>>>> config=5 the answerer may reply with config=4, 6, 7 or 8. >>>>> config=6 the answerer may reply with config=6, 7 or 8. >>>>> config=7 the answerer may reply with config=8 >>>>> config=8 the answerer may reply with config=7 In all cases the >>>>> answerer may reply with a completely removed "pause" >>>>> parameter. >>>>> >>>>> An answerer cannot add extra messages to what is provided in the Offer. >>>>> For example: If an Offer indicates config=6 an Answer cannot reply >>>>> with >>>>> config=3 indicating that it has the capability to receive PAUSE and >>>>> RESUME. An answerer may remove messages that it does not support. >>>>> For >>>>> example: if an Offer indicates config=6 an Answer may reply with >>>>> config=7 indicating that it can only receive PAUSED. >>>> [BoB] I get your point. There is significant inherent complexity in >>>> this that your proposal makes explicit and clarifies. I >>> would like to simplify and clarify this further by reducing the allowed configurations to be 1, 4, 5 and 6: >>>> 1) Full support of sending and receiving all messages ("ccm pause" without direction) >>>> As you say above, acceptable Answers include 1, 4, 5 or 6, or (of >>>> course) removing "ccm pause" entirely >>>> 4) Pause command receiver, sending result indications ("ccm pause dir=recvonly") >>>> Acceptable Answers include 5, 6, or removing ccm pause entirely >>>> 5) Pause command sender, receiving result indications ("ccm pause dir=sendonly") >>>> Acceptable Answers include 4, 6, or removing ccm pause entirely >>>> 6) Local pause support only ("ccm paused", and I then suggest >>>> removing direction from paused; either you support it or >>> you don't) >>>> Acceptable Answers include 6 or removing ccm paused entirely >>> [CNG] So to remove 2 and 3 the assumption must be that local pause is >>> not supported by a sendonly or receive only endpoint. Is that correct? >>> It would seem that if local pause was to be supported then 2 and 3 should be selected rather than 4 and 5. >>> To remove 7 and 8 the assumption must be that endpoints >>> supporting this draft must support local pause? Otherwise there's no way of saying "I won't send anything but if you do >> a local pause let me know". >> >> [BoB] I agree the 8 configurations you list makes sense to keep. They reflect the current text better than what I >> suggested. >> >>>> If those clarifications you list above on O/A and what messages are >>>> sent and/or received are made in the document, do >>> you still think we need to introduce the "config" concept, or will the >>> direction parameter to "pause" (as indicated in my shortened list above) be clear enough? >>> [CNG] I think having "paused" as a separate parameter as in your >>> proposal 6 just complicates things. Once you have two parameters then we come back to specifying the interaction >> between them. E.g. If A sends SDP "a=rtcp-fb:* ccm pause" >>> if B only supports local pause does it reply back with a different >>> parameter "a=rtcp-fb* ccm paused"? If so then it wouldn't make sense for an endpoint to send both "pause" and >> "paused". >> >> [BoB] As said above, just signaling ccm pause would have to mean that paused is not supported, so there would be no >> way to fall back to local pause, which is undesirable. Your "config" is better. >> >>>> I wonder, is it rather the notion of "direction" that becomes >>>> confusing, since "recvonly" actually includes sending >>> messages, only those messages are not "PAUSE" and "RESUME"? In that >>> case, could we call it something else than "direction"; like "dir=sendonly" -> "command-only" and "dir=recvonly" -> >> "indication-only"? >>> [CNG] Yes I think the direction is confusing considering that for >>> pause it's opposite the RTP flow direction, for paused its the same. To support pause an endpoint will send and receive >> messages. I don't think "command-only"/"indication-only" >>> help because they again relate to a direction. e.g. to support >>> "sendonly" an endpoint sends commands PAUSE/RESUME and receives indications PAUSED/REFUSEd. I think being >> explicit makes the description much easier. >> [BoB] Agree >> >> _______________________________________________ >> avtext mailing list >> avtext@ietf.org >> https://www.ietf.org/mailman/listinfo/avtext From nobody Tue Sep 16 02:13:06 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 11BEC1A01FA for ; Tue, 16 Sep 2014 02:13:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.698 X-Spam-Level: * X-Spam-Status: No, score=1.698 tagged_above=-999 required=5 tests=[BAYES_20=-0.001, J_CHICKENPOX_18=0.6, J_CHICKENPOX_38=0.6, J_CHICKENPOX_45=0.6, J_CHICKENPOX_46=0.6, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 55N6Cxs8gr6q for ; Tue, 16 Sep 2014 02:13:01 -0700 (PDT) Received: from sessmg22.ericsson.net (sessmg22.ericsson.net [193.180.251.58]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E2CA31A0478 for ; Tue, 16 Sep 2014 02:12:36 -0700 (PDT) X-AuditID: c1b4fb3a-f79da6d0000008c7-8a-5417ff026e05 Received: from ESESSHC020.ericsson.se (Unknown_Domain [153.88.253.124]) by sessmg22.ericsson.net (Symantec Mail Security) with SMTP id 9A.47.02247.20FF7145; Tue, 16 Sep 2014 11:12:34 +0200 (CEST) Received: from ESESSMB105.ericsson.se ([169.254.5.215]) by ESESSHC020.ericsson.se ([153.88.183.78]) with mapi id 14.03.0174.001; Tue, 16 Sep 2014 11:12:33 +0200 From: Bo Burman To: Christian Groves , "avtext@ietf.org" Thread-Topic: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 Thread-Index: Ac+oI8943NA5z66dRdGqdkJ2oCY7RQSn2IaAAC2sUTAALZTUgABGai2QARodEgABAng3IAAejgIAAIUmrNACKTUMMAAW6lyAAAteQRA= Date: Tue, 16 Sep 2014 09:12:33 +0000 Message-ID: References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com> <53F1DD5D.6030204@nteczone.com> <53F441C3.5050201@nteczone.com> <53FD7F8A.6060608@nteczone.com> <54051326.5090103@nteczone.com> <5417AB01.2010801@nteczone.com> In-Reply-To: <5417AB01.2010801@nteczone.com> Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.147] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrILMWRmVeSWpSXmKPExsUyM+JvjS7Tf/EQg703jCw+3rvBavHlfSOL A5PHkiU/mTxWnJ/JEsAUxWWTkpqTWZZapG+XwJXReeEeU8GdiYwVDx++Y2pgnFXaxcjJISFg IrHz7i9WCFtM4sK99WxdjFwcQgJHGSW+Hp/MCuEsYZQ4dHc/WBWbgIbE/B13GUFsEYFoia09 n5lBbGEBV4mpj+4xQ8TdJH7d2Qk0iQPILpNY3mMMYrIIqErcvuwDUsEr4Csx+dtuqPE3WCS2 7HkBNp5TQEdi8cLjYDajgKzE/e/3WEBsZgFxiVtP5jNBHCogsWTPeWYIW1Ti5eN/rCDzJQSU JKZtTYMo15FYsPsTG4StLbFs4WtmiL2CEidnPmGZwCg6C8nUWUhaZiFpmYWkZQEjyypG0eLU 4uLcdCMjvdSizOTi4vw8vbzUkk2MwDg5uOW31Q7Gg88dDzEKcDAq8fAu2CEWIsSaWFZcmXuI UZqDRUmcd+G5ecFCAumJJanZqakFqUXxRaU5qcWHGJk4OKUaGLn6lu3Rmn3/rDTnnKORV+Sd mvKZ9Sd7MczIecF3juNxz+npGnKX6zZdPl+ouHrOkfYTsknMFVaxNzauLFsdFZAdmGAULVfP afXF8xHblW8H84v+SqvaRwpXPd38zFbL9tnDu7FflwV6rEt4/qw6OPnBI2EVl8rn+RMj3GTK I7U3PV25IdXjlxJLcUaioRZzUXEiAIV9phJ0AgAA Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/4qeAJbqSZt_U4WrxxtgwLpg4wsE Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Sep 2014 09:13:05 -0000 Hi Christian, Thank you for good and constructive comments! My responses inline. Note that I need guidance on whether or not defined 'config' attribute valu= es need to be somehow mentioned in IANA section, and in that case how to de= scribe it. A reference to the table in Figure 6? Examples from other RFCs a= re welcome! Also, while editing the first part of section 9, I started to wonder if thi= s specification can really promise that existing 'ccm tmmbr' signaling mean= s TMMBR and TMMBN with value 0 is supported and will be treated correctly i= n all existing implementations? Should we not at least say there is no guar= antee TMMBR and TMMBN implementations pre-dating this specification work ex= actly as described when used with a bitrate value of 0? Cheers, /Bo > -----Original Message----- > From: Christian Groves [mailto:Christian.Groves@nteczone.com] > Sent: den 16 september 2014 05:14 > To: Bo Burman; avtext@ietf.org > Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 >=20 > Hello Bo, >=20 > Thanks for the updates. A few comments: >=20 > 1) Cl.6.3: Text was added to the Paused state regarding keepalives. Do we= also need that text in clause 6.4 on local > paused state? [BoB] I guess that does not harm. I'll add it. >=20 > 2) Cl.2.2: The term "REFUSED notification" is used but elsewhere "REFUSED= indication" is used. [BoB] Good catch. I'll change to "indication". >=20 > 3) Cl.9 Para.1: With respect to the use of the rtcp-fb attribute I think = the text should say "/MUST only be used as an SDP > media attribute and MUST NOT be provided at the session level/". The use = of "Recommended" > implies an option however there's a must against the use at session level= , so really there is no option. [BoB] I agree that "recommend" and "must" do not match. The current text in= that sentence is a bit poorly written. I think it tries to both describe w= hat is said in RFC 4585 and 5104 about the rtcp-fb attribute in general, as= well as saying that it applies also for this specification. That statement= is redundant. RFC 4585 section 4.2 is totally clear: "The 'rtcp-fb' attrib= ute MUST only be used as an SDP media attribute and MUST NOT be provided at= the session level". I think the sentence can be removed. >=20 > 4) General Nit: Sometimes "hold off period" is used, sometimes "hold off = time" is used. Could be consistent. [BoB] There are also sometimes "wait period" or "wait time". I'll change to= "hold-off period" throughout. >=20 > 5) Cl.9 Config value 5: " /streams it sends. It will send PAUSED and REF= USED as needed. It does not support pausing > received RTP streams, and thus does not send any PAUSE and RESUME request= s/ ". Could we modify it to read "/It does > not support sending PAUSE and RESUME requests to pause received RTP strea= ms.../"? It makes it clearer that the draft is > talking about a sending action rather than a local pause. [BoB] OK >=20 > 6) Cl.9 last para pg 28: "/All implementations of this specification MUST= be able to receive all// > // messages defined in Section 8/". Given that the config parameter > allows partial implementation then this statement isn't true. [BoB] My intent was to require that all implementations are able to at leas= t receive _and ignore_ all messages from section 8, regardless of config. T= hat would be in line with section 4.2 of RFC 4585: "RTP senders MUST be pre= pared to receive any kind of RTCP FB messages and MUST silently discard al= l those RTCP FB messages that they do not understand", but is thus strictly= redundant. I suggest to simply remove the sentence since it does not add a= nything. >=20 > 7) Cl.9 Fig.7: I'm not sure if "1"-"8" is valid range syntax for ABNF? > Cl.3.4/RFC5234 seems to imply that: pause-config-value =3D %x31-38 would = be equivalent to "1" / "2" / "3" / "4" / "5" / "6" / > "7" / "8". [BoB] You are right. I'll change it. > Also rather than having to enforce a once only usage for nowait and confi= g could the ABNF be updated to make sure, e.g. > rtcp-fb-ccm-param =3D/ SP "pause" [SP pause-config] [SP "nowait"] [BoB] OK. The fact that you by that require a strict ordering of attributes= is probably not limiting. >=20 > With respect to the extension token, the current form wouldn't allow some= thing like foo=3Dbar in the future as "=3D" isn't a > token character. > Firstly is it needed? if so then would something like [SP byte-string] be= more appropriate? [BoB] I think extensibility to be a good thing in general. Agree that byte-= string is better. >=20 >=20 > 8) Cl.9.2: " /First, the "config" attribute and its message directions ar= e// > // interpreted based on the node receiving the SDP./" Should this be > the node "providing" the SDP as per cl.9.1? [BoB] No. Declarative use of SDP seems to have this difference in interpret= ation of the SDP. First, see section 3.4 of RFC 4566 on Multicast Session A= nnouncement that says "remote participants can use the session description = to start the tools required to participate in the session". Second, compare= with section 6 of RFC 4566 where a=3Drecvonly is described as "specifies t= hat the tools should be started in a receive-only mode". This indicates to = me that the text currently in 9.2 is correct. >=20 > 9) Cl.11: Does the config parameter need to be included here? Also perhap= s 4) and 5) should say "pause feedback type" > as per the description of the "type" element. [BoB] 'config' should be in 3, yes. Don't know about config values. Guidanc= e appreciated! >=20 >=20 > Regards, Christian >=20 >=20 > On 16/09/2014 12:29 AM, Bo Burman wrote: > > Christian, Roni, all, > > > > Please find enclosed a draft update implementing Christian's suggested = changes below. Affected sections are 9 and > 10.1. > > Please have a look and let me know if the changes are acceptable and co= nsistent with our discussions. > > > > Cheers, > > /Bo > > > >> -----Original Message----- > >> From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bo Burman > >> Sent: den 5 september 2014 11:44 > >> To: Christian Groves; avtext@ietf.org > >> Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 > >> > >> Hi Christian, > >> > >> More inline. > >> > >> As a summary, I must conclude that Christian's proposal has > >> consistency and clarity benefits in SDP signaling compared to what is = currently in the text, and suggest that the text > should be changed accordingly: > >> > >> * The "dir" parameter of "ccm pause" is replaced by "config" as sugges= ted below. > >> * The separate "ccm paused" parameter is removed, since support of PAU= SED will instead be indicated through > "config" > >> > >> BR > >> /Bo > >> > >>> -----Original Message----- > >>> From: Christian Groves [mailto:Christian.Groves@nteczone.com] > >>> Sent: den 2 september 2014 02:45 > >>> To: Bo Burman; avtext@ietf.org > >>> Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 > >>> > >>> Hello Bo, > >>> > >>> Please see my replies below. > >>> > >>> Regards, Christian > >>> > >>> On 1/09/2014 9:51 PM, Bo Burman wrote: > >>>> ..snip.. > >>>> I think the following two main options are reasonable ways forward: > >>>> > >>>> 1) Remove the "paused" SDP parameter entirely, and with it the > >>>> possibility to implement support of only the local pause indication > >>>> > >>>> 2) Make the text consistently express that "paused" refers to > >>>> capability for that limited functionality. For SDP > >>>>> offer/answer, we then have a few more choices regarding the relatio= n between "pause" and "paused": > >>>>>> a) an offer expressing support for this specification MUST > >>>>>> contain only one of "pause" or "paused", and an offer > >>>>> with "pause" is possible to restrict by answering with "paused", > >>>>> but an offer with the limited "paused" cannot be upgraded to > >>>>> "pause" in the answer. May possibly cause problems with > >>> declarative use; guidance appreciated. > >>>>>> b) "pause" and "paused" are kept separate (what current text > >>>>>> mostly does, except for some confusion that must be corrected > >>>>>> throughout if this option is chosen); the offer MAY contain > >>>>>> either or both, while the answer MUST choose one and MUST NOT add > >>>>>> anything that was not in the offer > >>>>> [CNG] I wasn't following this closely when 'paused' was added so > >>>>> I'm not sure about removing it. It would simplify things if it was = removed. > >>>>> I think what would need to be added if local pause was supported > >>>>> without signalling is that a node supporting this draft must at > >>>>> minimum support the reception of a 'paused' indication and the > >>>>> sending of 'paused' if the node supports a paused state. There > >>>>> would probably need to be an extra value in direction > >>> indicating that PAUSE/RESUME is not sent or received. > >>>> [BoB] You mean using additional direction signaling for pause > >>>> instead of the tag "paused"? I don't see how that goes > >>> with your statement "supported without signaling" a few sentences bac= k, since that is then also explicit signaling? > >>> [CNG] Yes an additional direction. I was thinking about how to > >>> specify "local pause" where the endpoint didn't support > >>> sendonly,recvonly or sendrecv. It wouldn't be correct for the endpoin= t to send "a=3Drtcp-fb:* ccm pause" because the > default is "sendrecv". > >> [BoB] Thinking this through again. It is possible to make the > >> currently proposed signaling in the draft consistent, but only if > >> capability and indication of pause and local pause are changed to be t= otally independent functions. The 8 > configurations you list are then possible to express, using direction par= ameter of both pause and paused ([] indicates > optional). > >> > >> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive > >> (PAUSED,RESUMED,PAUSED,REFUSED) > >> a=3Drtcp-fb:* ccm pause [dir=3Dsendrecv] > >> a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] > >> > >> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) > >> a=3Drtcp-fb:* ccm pause dir=3Dsendonly > >> a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] > >> > >> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) > >> a=3Drtcp-fb:* ccm pause dir=3Drecvonly > >> a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] > >> > >> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) > >> a=3Drtcp-fb:* ccm pause dir=3Drecvonly > >> a=3Drtcp-fb:* ccm paused dir=3Dsendonly > >> > >> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) > >> a=3Drtcp-fb:* ccm pause dir=3Dsendonly > >> a=3Drtcp-fb:* ccm paused dir=3Drecvonly > >> > >> 6) Send(PAUSED) Receive(PAUSED) > >> a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] > >> > >> 7) Send() Receive(PAUSED) > >> a=3Drtcp-fb:* ccm paused dir=3Drecvonly > >> > >> 8) Send(PAUSED) Receive() > >> a=3Drtcp-fb:* ccm paused dir=3Dsendonly > >> > >> That split would however also mean there is a possibility to support > >> PAUSE but not PAUSED, which I believe is an undesirable side-effect an= d definitely not in line with the current text. > >> > >> As a summary, I must agree that your proposal to use a "config" > >> parameter with an explicit listing of supported messages and direction= s is indeed much easier to describe and is > beneficial for text clarity. > >> > >>>>> Maybe an option 2c: If local pause is kept and it needs to be > >>>>> supported by signalling there actually appears to be 8 > >>>>> combinations of sent and received messages. I assume a node > >>>>> supporting the sending and/or reception of PAUSE must also support > >>>>> RESUME. A node supporting the reception of PAUSE/RESUME must also > >>> support sending PAUSED and REFUSED. > >>>> [BoB] An observation: I see you more or less consistently using > >>>> "REFUSED" instead of the currently defined tag > >>> "REFUSE". This is actually consistent with it being an > >>> indication/response rather than a command, and thus probably a > >>> better name. Do you suggest that we change the > >> name to "REFUSED" in the draft? > >>> [CNG] I wasn't proposing the change, I guess I just aligned "paused" = and "refused". I'd be OK with changing it. > >> [BoB] Unless someone else objects, I will change REFUSE to REFUSED > >> throughout, to better reflect that it is an indication, not a command. > >> > >>>>> The combinations a Node can support are: > >>>>> > >>>>> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive > >>>>> (PAUSED,RESUMED,PAUSED,REFUSED) > >>>>> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) > >>>>> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) > >>>>> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) > >>>>> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) > >>>>> 6) Send(PAUSED) Receive(PAUSED) > >>>>> 7) Send() Receive(PAUSED) > >>>>> 8) Send(PAUSED) Receive() > >>>>> > >>>>> Would it be easier to simply signal the messages that are > >>>>> supported rather than two parameters with a direction parameters? > >>>>> e.g. the draft could have the above list of values. If a node > >>>>> supported both the sending and reception of > >>>>> PAUSE/RESUME/PAUSED/REFUSED then it could signal e.g. a=3Drtcp-fb:9= 8 > >>>>> ccm pause > >>> config=3D1 . Part of the confusion comes from the interaction between > >>> the parameters. This would remove the > >> interaction. > >>>>> It might make describing the SDP O/A procedures easier. > >>>>> e.g. > >>>>> On receiving an Offer with: > >>>>> config=3D1 the answerer may reply with config=3D1, 2, 3, 4, 5, 6, 7= or 8. > >>>>> config=3D2 the answerer may reply with config=3D3, 4, 5, 6, 7 or 8. > >>>>> config=3D3 the answerer may reply with config=3D2, 4, 5, 6, 7 or 8. > >>>>> config=3D4 the answerer may reply with config=3D5, 6, 7 or 8. > >>>>> config=3D5 the answerer may reply with config=3D4, 6, 7 or 8. > >>>>> config=3D6 the answerer may reply with config=3D6, 7 or 8. > >>>>> config=3D7 the answerer may reply with config=3D8 > >>>>> config=3D8 the answerer may reply with config=3D7 In all cases the > >>>>> answerer may reply with a completely removed "pause" > >>>>> parameter. > >>>>> > >>>>> An answerer cannot add extra messages to what is provided in the Of= fer. > >>>>> For example: If an Offer indicates config=3D6 an Answer cannot repl= y > >>>>> with > >>>>> config=3D3 indicating that it has the capability to receive PAUSE > >>>>> and RESUME. An answerer may remove messages that it does not suppor= t. > >>>>> For > >>>>> example: if an Offer indicates config=3D6 an Answer may reply with > >>>>> config=3D7 indicating that it can only receive PAUSED. > >>>> [BoB] I get your point. There is significant inherent complexity in > >>>> this that your proposal makes explicit and clarifies. I > >>> would like to simplify and clarify this further by reducing the allow= ed configurations to be 1, 4, 5 and 6: > >>>> 1) Full support of sending and receiving all messages ("ccm pause" w= ithout direction) > >>>> As you say above, acceptable Answers include 1, 4, 5 or 6, or (of > >>>> course) removing "ccm pause" entirely > >>>> 4) Pause command receiver, sending result indications ("ccm pause di= r=3Drecvonly") > >>>> Acceptable Answers include 5, 6, or removing ccm pause entirely > >>>> 5) Pause command sender, receiving result indications ("ccm pause di= r=3Dsendonly") > >>>> Acceptable Answers include 4, 6, or removing ccm pause entirely > >>>> 6) Local pause support only ("ccm paused", and I then suggest > >>>> removing direction from paused; either you support it or > >>> you don't) > >>>> Acceptable Answers include 6 or removing ccm paused entirely > >>> [CNG] So to remove 2 and 3 the assumption must be that local pause > >>> is not supported by a sendonly or receive only endpoint. Is that corr= ect? > >>> It would seem that if local pause was to be supported then 2 and 3 sh= ould be selected rather than 4 and 5. > >>> To remove 7 and 8 the assumption must be that endpoints > >>> supporting this draft must support local pause? Otherwise there's no > >>> way of saying "I won't send anything but if you do > >> a local pause let me know". > >> > >> [BoB] I agree the 8 configurations you list makes sense to keep. They > >> reflect the current text better than what I suggested. > >> > >>>> If those clarifications you list above on O/A and what messages are > >>>> sent and/or received are made in the document, do > >>> you still think we need to introduce the "config" concept, or will > >>> the direction parameter to "pause" (as indicated in my shortened list= above) be clear enough? > >>> [CNG] I think having "paused" as a separate parameter as in your > >>> proposal 6 just complicates things. Once you have two parameters > >>> then we come back to specifying the interaction > >> between them. E.g. If A sends SDP "a=3Drtcp-fb:* ccm pause" > >>> if B only supports local pause does it reply back with a different > >>> parameter "a=3Drtcp-fb* ccm paused"? If so then it wouldn't make sens= e > >>> for an endpoint to send both "pause" and > >> "paused". > >> > >> [BoB] As said above, just signaling ccm pause would have to mean that > >> paused is not supported, so there would be no way to fall back to loca= l pause, which is undesirable. Your "config" is > better. > >> > >>>> I wonder, is it rather the notion of "direction" that becomes > >>>> confusing, since "recvonly" actually includes sending > >>> messages, only those messages are not "PAUSE" and "RESUME"? In that > >>> case, could we call it something else than "direction"; like > >>> "dir=3Dsendonly" -> "command-only" and "dir=3Drecvonly" -> > >> "indication-only"? > >>> [CNG] Yes I think the direction is confusing considering that for > >>> pause it's opposite the RTP flow direction, for paused its the same. > >>> To support pause an endpoint will send and receive > >> messages. I don't think "command-only"/"indication-only" > >>> help because they again relate to a direction. e.g. to support > >>> "sendonly" an endpoint sends commands PAUSE/RESUME and receives > >>> indications PAUSED/REFUSEd. I think being > >> explicit makes the description much easier. > >> [BoB] Agree > >> > >> _______________________________________________ > >> avtext mailing list > >> avtext@ietf.org > >> https://www.ietf.org/mailman/listinfo/avtext From nobody Tue Sep 16 21:54:23 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6329D1A212A for ; Tue, 16 Sep 2014 21:53:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.851 X-Spam-Level: X-Spam-Status: No, score=-0.851 tagged_above=-999 required=5 tests=[BAYES_50=0.8, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-1.652, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BYRPewBBoumF for ; Tue, 16 Sep 2014 21:53:10 -0700 (PDT) Received: from BLU004-OMC2S31.hotmail.com (blu004-omc2s31.hotmail.com [65.55.111.106]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A9AD61A068D for ; Tue, 16 Sep 2014 21:53:09 -0700 (PDT) Received: from BLU181-W11 ([65.55.111.73]) by BLU004-OMC2S31.hotmail.com with Microsoft SMTPSVC(7.5.7601.22724); Tue, 16 Sep 2014 21:53:08 -0700 X-TMN: [MpiCZnzgxTBPEj+GyFmsLlpCv0prYrCN] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_bf526327-a7b4-4be8-aa35-1be95638f390_" From: Bernard Aboba To: "avtext@ietf.org" Date: Tue, 16 Sep 2014 21:53:08 -0700 Importance: Normal In-Reply-To: References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com>, <53F1DD5D.6030204@nteczone.com>, , <53F441C3.5050201@nteczone.com>, , <53FD7F8A.6060608@nteczone.com>, , <54051326.5090103@nteczone.com>, , , <5417AB01.2010801@nteczone.com>, MIME-Version: 1.0 X-OriginalArrivalTime: 17 Sep 2014 04:53:08.0771 (UTC) FILETIME=[46A97730:01CFD233] Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/OJQpRRTW5DkxEnggFOWxmc-Rmtg Subject: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Sep 2014 04:53:12 -0000 --_bf526327-a7b4-4be8-aa35-1be95638f390_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Section 1 =20 This document describes several scenarios in multimedia communication where a conferencing node or participant chooses to temporarily pause an incoming RTP [RFC3550] stream and later resume it when needed. The receiver does not need to terminate or inactivate the RTP session and start all over again by negotiating the session parameters=2C for example using SIP [RFC3261] with SDP Offer/Answer [RFC3264]. =20 Centralized nodes=2C like RTP Mixers or MCUs=2C which either uses logic based on voice activity=2C other measurements=2C or user input could reduce the resources consumed in both the sender and the network by temporarily pausing the RTP streams that aren't required by the RTP Mixer. =20 [BA] There is another potential use case for a centralized node. Could str= eam pause/resume also be used to enable a centralized node to notify a rece= iver that it has chosen to pause a stream on its own (without being asked)?= For example=2C there are situations where an multi-stream SFU may wish to= drop a layer (RTCP RRs or PLI indicates congestion). Today this is handle= d via codec-specific messages (e.g. SEI layer drop). However=2C if it was= desired to handle this in a codec-independent way=2C could a centralized n= ode send an unsolicited PAUSED (e.g. TMMBN =3D 0) message? =20 Section 4.2 =20 =0A= =0A= It is the responsibility of an RTP stream receiver=2C who wants to=0A= pause or resume a stream from the sender(s)=2C to transmit PAUSE and=0A= RESUME messages. An RTP stream sender who likes to pause itself=2C can= =0A= simply do it. Any indication that an RTP stream is paused is the=0A= responsibility of the RTP stream sender and may in some cases not=0A= even be needed by the stream receiver. =20 [BA] Not sure I agree with this for the multi-stream transmission case. If= a sender stops sending a layer with no notification=2C then the receiver c= ould be adversely affected. For example=2C it could be waiting for a spati= al enhancement layer that never shows up. That is why we have SEI layer d= rop messages=2C right?=20 =20 Section 4.4 =20 An RTP stream sender should not pause an SSRC that some receiver still wi= shes to receive. The reason is that in RTP topologies where the stream i= s shared between multiple receivers=2C a single receiver on that shared n= etwork=2C independent of it being multicast=2C a mesh with joint RTP sess= ion or a transport Translator based=2C must not single- handedly cause th= e stream to be paused without letting all other receivers to voice their = opinions on whether or not the stream should be paused. A consequence of= this is that a newly joining receiver=2C for example indicated by an RTC= P Receiver Report containing both a new SSRC and a CNAME that does not al= ready occur in the session=2C firstly needs to learn the existence of pau= sed streams=2C and secondly should be able to resume any paused stream. = Any single receiver wanting to resume a stream should also cause it to be= resumed.=20 =20 [BA] In many simulcast and MST implementations=2C the centralized unit util= izes sender-based congestion control=2C which means that it decides which s= treams to send based on indications from the receiver such as packet loss= =2C etc. If there is substantial loss=2C the sender will adjust the strea= ms it is sending. In implementations where the SFU uses a distinct SSRC fo= r each simulcast stream (as opposed to using the same SSRC but adjusting th= e resolution/framerate)=2C it may pause sending one SSRC and resume sending= another (lower bandwidth one). Where MST is in use=2C the sender may paus= e an enhancement layer and subsequently resume sending it when it has reaso= n to believe that there is sufficient bandwidth to handle it. Whether rece= iver "wishes to receive" a stream doesn't really enter into the sender's de= cision if it determines that there isn't sufficient bandwidth available to = send it successfully.=20 =20 =20 =20 =20 = --_bf526327-a7b4-4be8-aa35-1be95638f390_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Section 1
 =3B
 = =3B =3B This document describes several
 =3B =3B scenarios i= n multimedia communication where a conferencing node or
 =3B =3B= participant chooses to temporarily pause an incoming RTP [RFC3550]
 =3B =3B stream and later res= ume it when needed. =3B The receiver does not need
 =3B =3B = to terminate or inactivate the RTP session and start all over again
&nbs= p=3B =3B by negotiating the session parameters=2C for example using SIP=
 =3B =3B [RFC3261] with SDP Offer/Answer= [RFC3264].
 =3B<= BR> =3B Centralized nodes=2C like RTP Mixers or MCUs=2C which either us= es logic
 =3B =3B based on voice activity=2C other measurements= =2C or user input could
 =3B =3B reduce the resources consumed i= n both the sender and the network by
 =3B =3B temporarily pausin= g the RTP streams that aren't required by the RTP
 =3B =3B Mixer= .
 =3B
[BA] There is another potential use case for a centralized= node. =3B Could stream pause/resume also be used to enable a centraliz= ed node to notify a receiver that it has chosen to pause a stream on its ow= n (without being asked)? =3B For example=2C there are situations where = an multi-stream SFU may wish to drop a layer (RTCP RRs or PLI indicates con= gestion). =3B Today this is handled via codec-specific messages (e.g. S= EI layer drop). =3B =3B =3BHowever=2C if it was desired to hand= le this in a codec-independent way=2C could a centralized node send an unso= licited =3BPAUSED (e.g. TMMBN =3D 0) message?
 =3B
Section 4.= 2
 =3B
=0A= =0A= It is the responsibility of an RTP stream receiver=2C who wants to=0A= pause or resume a stream from the sender(s)=2C to transmit PAUSE and=0A= RESUME messages. An RTP stream sender who likes to pause itself=2C can= =0A= simply do it. Any indication that an RTP stream is paused is the=0A= responsibility of the RTP stream sender and may in some cases not=0A= even be needed by the stream receiver.
 =3B
[BA] Not sure I ag= ree with this for the multi-stream transmission case. =3B If =3Ba s= ender stops sending a layer with no notification=2C then the receiver could= be adversely affected. =3B For example=2C it could be waiting for a sp= atial enhancement layer that never shows up. =3B =3B That is why we= have SEI layer drop messages=2C right?
 =3B
Section 4.4
&nbs= p=3B
An RTP stream sender should not pause an SSRC that some receiver = still wishes to receive. The reason is that in RTP topologies where the = stream is shared between multiple receivers=2C a single receiver on that = shared network=2C independent of it being multicast=2C a mesh with joint = RTP session or a transport Translator based=2C must not single- handedly = cause the stream to be paused without letting all other receivers to voic= e their opinions on whether or not the stream should be paused. A conseq= uence of this is that a newly joining receiver=2C for example indicated b= y an RTCP Receiver Report containing both a new SSRC and a CNAME that doe= s not already occur in the session=2C firstly needs to learn the existenc= e of paused streams=2C and secondly should be able to resume any paused s= tream. Any single receiver wanting to resume a stream should also cause = it to be resumed.
 =3B
[BA] In many simulcast and MST implementa= tions=2C the centralized unit utilizes sender-based congestion control=2C w= hich means that it decides which streams to send based on indications from = the receiver such as packet loss=2C etc. =3B =3B If there is substa= ntial loss=2C the sender will adjust the streams it is sending. =3B In = implementations where the SFU uses a distinct SSRC for each simulcast strea= m (as opposed to using the same SSRC but adjusting the resolution/framerate= )=2C it may =3Bpause sending one SSRC and =3Bresume sending another= (lower bandwidth one). =3B Where MST is in use=2C the sender may pause= an enhancement layer and subsequently resume sending it when it has reason= to believe that there is sufficient bandwidth to handle it. =3B Whethe= r receiver "wishes to receive" a stream doesn't really enter into the sende= r's decision if it determines that there isn't sufficient bandwidth availab= le to send it successfully.
 =3B
 =3B
=

 =3B

 =3B

 =3B
= --_bf526327-a7b4-4be8-aa35-1be95638f390_-- From nobody Tue Sep 16 23:21:13 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D98F01A6F9F for ; Tue, 16 Sep 2014 23:21:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.5 X-Spam-Level: X-Spam-Status: No, score=0.5 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, J_CHICKENPOX_18=0.6, J_CHICKENPOX_38=0.6, J_CHICKENPOX_45=0.6, J_CHICKENPOX_46=0.6] autolearn=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Cje-4CkSMELR for ; Tue, 16 Sep 2014 23:21:09 -0700 (PDT) Received: from cserver5.myshophosting.com (cserver5.myshophosting.com [175.107.161.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 123BE1A6F9E for ; Tue, 16 Sep 2014 23:21:09 -0700 (PDT) Received: from ppp118-209-111-109.lns20.mel4.internode.on.net ([118.209.111.109]:55555 helo=[127.0.0.1]) by cserver5.myshophosting.com with esmtpsa (TLSv1:DHE-RSA-AES128-SHA:128) (Exim 4.82) (envelope-from ) id 1XU8a7-0006ma-4i; Wed, 17 Sep 2014 16:19:11 +1000 Message-ID: <5419284D.70804@nteczone.com> Date: Wed, 17 Sep 2014 16:21:01 +1000 From: Christian Groves User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Bo Burman , "avtext@ietf.org" References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com> <53F1DD5D.6030204@nteczone.com> <53F441C3.5050201@nteczone.com> <53FD7F8A.6060608@nteczone.com> <54051326.5090103@nteczone.com> <5417AB01.2010801@nteczone.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cserver5.myshophosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - nteczone.com X-Get-Message-Sender-Via: cserver5.myshophosting.com: authenticated_id: christian.groves@nteczone.com X-Source: X-Source-Args: X-Source-Dir: Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/YNvpWYYcuggMvIbzHtB4NnGAr4c Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Sep 2014 06:21:13 -0000 Hello Bo, Please see my replies below. Regards, Christian On 16/09/2014 7:12 PM, Bo Burman wrote: > Hi Christian, > > Thank you for good and constructive comments! My responses inline. > > Note that I need guidance on whether or not defined 'config' attribute values need to be somehow mentioned in IANA section, and in that case how to describe it. A reference to the table in Figure 6? Examples from other RFCs are welcome! > > Also, while editing the first part of section 9, I started to wonder if this specification can really promise that existing 'ccm tmmbr' signaling means TMMBR and TMMBN with value 0 is supported and will be treated correctly in all existing implementations? Should we not at least say there is no guarantee TMMBR and TMMBN implementations pre-dating this specification work exactly as described when used with a bitrate value of 0? [CNG] The later seems a safer assumption. > > Cheers, > /Bo > > ..snip >> 3) Cl.9 Para.1: With respect to the use of the rtcp-fb attribute I think the text should say "/MUST only be used as an SDP >> media attribute and MUST NOT be provided at the session level/". The use of "Recommended" >> implies an option however there's a must against the use at session level, so really there is no option. > [BoB] I agree that "recommend" and "must" do not match. The current text in that sentence is a bit poorly written. I think it tries to both describe what is said in RFC 4585 and 5104 about the rtcp-fb attribute in general, as well as saying that it applies also for this specification. That statement is redundant. RFC 4585 section 4.2 is totally clear: "The 'rtcp-fb' attribute MUST only be used as an SDP media attribute and MUST NOT be provided at the session level". I think the sentence can be removed. [CNG] OK > >> 4) General Nit: Sometimes "hold off period" is used, sometimes "hold off time" is used. Could be consistent. > [BoB] There are also sometimes "wait period" or "wait time". I'll change to "hold-off period" throughout. [CNG] OK > > ..snip.. >> 6) Cl.9 last para pg 28: "/All implementations of this specification MUST be able to receive all// >> // messages defined in Section 8/". Given that the config parameter >> allows partial implementation then this statement isn't true. > [BoB] My intent was to require that all implementations are able to at least receive _and ignore_ all messages from section 8, regardless of config. That would be in line with section 4.2 of RFC 4585: "RTP senders MUST be prepared to receive any kind of RTCP FB messages and MUST silently discard all those RTCP FB messages that they do not understand", but is thus strictly redundant. I suggest to simply remove the sentence since it does not add anything. [CNG] OK > ..snip.. > >> >> 8) Cl.9.2: " /First, the "config" attribute and its message directions are// >> // interpreted based on the node receiving the SDP./" Should this be >> the node "providing" the SDP as per cl.9.1? > [BoB] No. Declarative use of SDP seems to have this difference in interpretation of the SDP. First, see section 3.4 of RFC 4566 on Multicast Session Announcement that says "remote participants can use the session description to start the tools required to participate in the session". Second, compare with section 6 of RFC 4566 where a=recvonly is described as "specifies that the tools should be started in a receive-only mode". This indicates to me that the text currently in 9.2 is correct. [CNG] Yes, seems you're right. > >> 9) Cl.11: Does the config parameter need to be included here? Also perhaps 4) and 5) should say "pause feedback type" >> as per the description of the "type" element. > [BoB] 'config' should be in 3, yes. Don't know about config values. Guidance appreciated! [CNG] You may want to be more formal in the way the updates are specified to make it clear to IANA what exactly they have to do, e.g. similar to RFC5104. 11. IANA Considerations This specification requests the following registrations from IANA 1) A new value for media stream pause / resume to be registered with IANA in the "FMT Values for RTPFB Payload Types" registry located at the time of publication at: http://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml Value: 9 Name: PAUSE RESUME Long Name: Media Pause Resume Reference: This RFC. 2) A new value "pause" to be registered with IANA in the "Codec Control Messages" registry located at the time of publication at: http://www.iana.org/assignments/sdp-parameters/sdp-parameters.xhtml#sdp-parameters-19 Name Long Name Value Reference -------------- --------------------------------- ----- --------- PAUSERES Pause / Resume Media Sending 9 This RFC With regards to the "no wait" and "config" parameters I don't think you need a registry for these are they don't need to be extensible. RFCs 4585 and 5104 don't register these types of sub-parameters. For 4 & 5 'pause' Types, I'm not sure a registry is needed for these. I would assume that any new value would be as a result of a revision to the pause/resume RFC. If you set up a registry for these 'pause' types then you have to specify the process used in order to update it. > >> >> Regards, Christian >> >> >> On 16/09/2014 12:29 AM, Bo Burman wrote: >>> Christian, Roni, all, >>> >>> Please find enclosed a draft update implementing Christian's suggested changes below. Affected sections are 9 and >> 10.1. >>> Please have a look and let me know if the changes are acceptable and consistent with our discussions. >>> >>> Cheers, >>> /Bo >>> >>>> -----Original Message----- >>>> From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bo Burman >>>> Sent: den 5 september 2014 11:44 >>>> To: Christian Groves; avtext@ietf.org >>>> Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 >>>> >>>> Hi Christian, >>>> >>>> More inline. >>>> >>>> As a summary, I must conclude that Christian's proposal has >>>> consistency and clarity benefits in SDP signaling compared to what is currently in the text, and suggest that the text >> should be changed accordingly: >>>> * The "dir" parameter of "ccm pause" is replaced by "config" as suggested below. >>>> * The separate "ccm paused" parameter is removed, since support of PAUSED will instead be indicated through >> "config" >>>> BR >>>> /Bo >>>> >>>>> -----Original Message----- >>>>> From: Christian Groves [mailto:Christian.Groves@nteczone.com] >>>>> Sent: den 2 september 2014 02:45 >>>>> To: Bo Burman; avtext@ietf.org >>>>> Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 >>>>> >>>>> Hello Bo, >>>>> >>>>> Please see my replies below. >>>>> >>>>> Regards, Christian >>>>> >>>>> On 1/09/2014 9:51 PM, Bo Burman wrote: >>>>>> ..snip.. >>>>>> I think the following two main options are reasonable ways forward: >>>>>> >>>>>> 1) Remove the "paused" SDP parameter entirely, and with it the >>>>>> possibility to implement support of only the local pause indication >>>>>> >>>>>> 2) Make the text consistently express that "paused" refers to >>>>>> capability for that limited functionality. For SDP >>>>>>> offer/answer, we then have a few more choices regarding the relation between "pause" and "paused": >>>>>>>> a) an offer expressing support for this specification MUST >>>>>>>> contain only one of "pause" or "paused", and an offer >>>>>>> with "pause" is possible to restrict by answering with "paused", >>>>>>> but an offer with the limited "paused" cannot be upgraded to >>>>>>> "pause" in the answer. May possibly cause problems with >>>>> declarative use; guidance appreciated. >>>>>>>> b) "pause" and "paused" are kept separate (what current text >>>>>>>> mostly does, except for some confusion that must be corrected >>>>>>>> throughout if this option is chosen); the offer MAY contain >>>>>>>> either or both, while the answer MUST choose one and MUST NOT add >>>>>>>> anything that was not in the offer >>>>>>> [CNG] I wasn't following this closely when 'paused' was added so >>>>>>> I'm not sure about removing it. It would simplify things if it was removed. >>>>>>> I think what would need to be added if local pause was supported >>>>>>> without signalling is that a node supporting this draft must at >>>>>>> minimum support the reception of a 'paused' indication and the >>>>>>> sending of 'paused' if the node supports a paused state. There >>>>>>> would probably need to be an extra value in direction >>>>> indicating that PAUSE/RESUME is not sent or received. >>>>>> [BoB] You mean using additional direction signaling for pause >>>>>> instead of the tag "paused"? I don't see how that goes >>>>> with your statement "supported without signaling" a few sentences back, since that is then also explicit signaling? >>>>> [CNG] Yes an additional direction. I was thinking about how to >>>>> specify "local pause" where the endpoint didn't support >>>>> sendonly,recvonly or sendrecv. It wouldn't be correct for the endpoint to send "a=rtcp-fb:* ccm pause" because the >> default is "sendrecv". >>>> [BoB] Thinking this through again. It is possible to make the >>>> currently proposed signaling in the draft consistent, but only if >>>> capability and indication of pause and local pause are changed to be totally independent functions. The 8 >> configurations you list are then possible to express, using direction parameter of both pause and paused ([] indicates >> optional). >>>> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive >>>> (PAUSED,RESUMED,PAUSED,REFUSED) >>>> a=rtcp-fb:* ccm pause [dir=sendrecv] >>>> a=rtcp-fb:* ccm paused [dir=sendrecv] >>>> >>>> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) >>>> a=rtcp-fb:* ccm pause dir=sendonly >>>> a=rtcp-fb:* ccm paused [dir=sendrecv] >>>> >>>> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) >>>> a=rtcp-fb:* ccm pause dir=recvonly >>>> a=rtcp-fb:* ccm paused [dir=sendrecv] >>>> >>>> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) >>>> a=rtcp-fb:* ccm pause dir=recvonly >>>> a=rtcp-fb:* ccm paused dir=sendonly >>>> >>>> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) >>>> a=rtcp-fb:* ccm pause dir=sendonly >>>> a=rtcp-fb:* ccm paused dir=recvonly >>>> >>>> 6) Send(PAUSED) Receive(PAUSED) >>>> a=rtcp-fb:* ccm paused [dir=sendrecv] >>>> >>>> 7) Send() Receive(PAUSED) >>>> a=rtcp-fb:* ccm paused dir=recvonly >>>> >>>> 8) Send(PAUSED) Receive() >>>> a=rtcp-fb:* ccm paused dir=sendonly >>>> >>>> That split would however also mean there is a possibility to support >>>> PAUSE but not PAUSED, which I believe is an undesirable side-effect and definitely not in line with the current text. >>>> >>>> As a summary, I must agree that your proposal to use a "config" >>>> parameter with an explicit listing of supported messages and directions is indeed much easier to describe and is >> beneficial for text clarity. >>>>>>> Maybe an option 2c: If local pause is kept and it needs to be >>>>>>> supported by signalling there actually appears to be 8 >>>>>>> combinations of sent and received messages. I assume a node >>>>>>> supporting the sending and/or reception of PAUSE must also support >>>>>>> RESUME. A node supporting the reception of PAUSE/RESUME must also >>>>> support sending PAUSED and REFUSED. >>>>>> [BoB] An observation: I see you more or less consistently using >>>>>> "REFUSED" instead of the currently defined tag >>>>> "REFUSE". This is actually consistent with it being an >>>>> indication/response rather than a command, and thus probably a >>>>> better name. Do you suggest that we change the >>>> name to "REFUSED" in the draft? >>>>> [CNG] I wasn't proposing the change, I guess I just aligned "paused" and "refused". I'd be OK with changing it. >>>> [BoB] Unless someone else objects, I will change REFUSE to REFUSED >>>> throughout, to better reflect that it is an indication, not a command. >>>> >>>>>>> The combinations a Node can support are: >>>>>>> >>>>>>> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive >>>>>>> (PAUSED,RESUMED,PAUSED,REFUSED) >>>>>>> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) >>>>>>> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) >>>>>>> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) >>>>>>> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) >>>>>>> 6) Send(PAUSED) Receive(PAUSED) >>>>>>> 7) Send() Receive(PAUSED) >>>>>>> 8) Send(PAUSED) Receive() >>>>>>> >>>>>>> Would it be easier to simply signal the messages that are >>>>>>> supported rather than two parameters with a direction parameters? >>>>>>> e.g. the draft could have the above list of values. If a node >>>>>>> supported both the sending and reception of >>>>>>> PAUSE/RESUME/PAUSED/REFUSED then it could signal e.g. a=rtcp-fb:98 >>>>>>> ccm pause >>>>> config=1 . Part of the confusion comes from the interaction between >>>>> the parameters. This would remove the >>>> interaction. >>>>>>> It might make describing the SDP O/A procedures easier. >>>>>>> e.g. >>>>>>> On receiving an Offer with: >>>>>>> config=1 the answerer may reply with config=1, 2, 3, 4, 5, 6, 7 or 8. >>>>>>> config=2 the answerer may reply with config=3, 4, 5, 6, 7 or 8. >>>>>>> config=3 the answerer may reply with config=2, 4, 5, 6, 7 or 8. >>>>>>> config=4 the answerer may reply with config=5, 6, 7 or 8. >>>>>>> config=5 the answerer may reply with config=4, 6, 7 or 8. >>>>>>> config=6 the answerer may reply with config=6, 7 or 8. >>>>>>> config=7 the answerer may reply with config=8 >>>>>>> config=8 the answerer may reply with config=7 In all cases the >>>>>>> answerer may reply with a completely removed "pause" >>>>>>> parameter. >>>>>>> >>>>>>> An answerer cannot add extra messages to what is provided in the Offer. >>>>>>> For example: If an Offer indicates config=6 an Answer cannot reply >>>>>>> with >>>>>>> config=3 indicating that it has the capability to receive PAUSE >>>>>>> and RESUME. An answerer may remove messages that it does not support. >>>>>>> For >>>>>>> example: if an Offer indicates config=6 an Answer may reply with >>>>>>> config=7 indicating that it can only receive PAUSED. >>>>>> [BoB] I get your point. There is significant inherent complexity in >>>>>> this that your proposal makes explicit and clarifies. I >>>>> would like to simplify and clarify this further by reducing the allowed configurations to be 1, 4, 5 and 6: >>>>>> 1) Full support of sending and receiving all messages ("ccm pause" without direction) >>>>>> As you say above, acceptable Answers include 1, 4, 5 or 6, or (of >>>>>> course) removing "ccm pause" entirely >>>>>> 4) Pause command receiver, sending result indications ("ccm pause dir=recvonly") >>>>>> Acceptable Answers include 5, 6, or removing ccm pause entirely >>>>>> 5) Pause command sender, receiving result indications ("ccm pause dir=sendonly") >>>>>> Acceptable Answers include 4, 6, or removing ccm pause entirely >>>>>> 6) Local pause support only ("ccm paused", and I then suggest >>>>>> removing direction from paused; either you support it or >>>>> you don't) >>>>>> Acceptable Answers include 6 or removing ccm paused entirely >>>>> [CNG] So to remove 2 and 3 the assumption must be that local pause >>>>> is not supported by a sendonly or receive only endpoint. Is that correct? >>>>> It would seem that if local pause was to be supported then 2 and 3 should be selected rather than 4 and 5. >>>>> To remove 7 and 8 the assumption must be that endpoints >>>>> supporting this draft must support local pause? Otherwise there's no >>>>> way of saying "I won't send anything but if you do >>>> a local pause let me know". >>>> >>>> [BoB] I agree the 8 configurations you list makes sense to keep. They >>>> reflect the current text better than what I suggested. >>>> >>>>>> If those clarifications you list above on O/A and what messages are >>>>>> sent and/or received are made in the document, do >>>>> you still think we need to introduce the "config" concept, or will >>>>> the direction parameter to "pause" (as indicated in my shortened list above) be clear enough? >>>>> [CNG] I think having "paused" as a separate parameter as in your >>>>> proposal 6 just complicates things. Once you have two parameters >>>>> then we come back to specifying the interaction >>>> between them. E.g. If A sends SDP "a=rtcp-fb:* ccm pause" >>>>> if B only supports local pause does it reply back with a different >>>>> parameter "a=rtcp-fb* ccm paused"? If so then it wouldn't make sense >>>>> for an endpoint to send both "pause" and >>>> "paused". >>>> >>>> [BoB] As said above, just signaling ccm pause would have to mean that >>>> paused is not supported, so there would be no way to fall back to local pause, which is undesirable. Your "config" is >> better. >>>>>> I wonder, is it rather the notion of "direction" that becomes >>>>>> confusing, since "recvonly" actually includes sending >>>>> messages, only those messages are not "PAUSE" and "RESUME"? In that >>>>> case, could we call it something else than "direction"; like >>>>> "dir=sendonly" -> "command-only" and "dir=recvonly" -> >>>> "indication-only"? >>>>> [CNG] Yes I think the direction is confusing considering that for >>>>> pause it's opposite the RTP flow direction, for paused its the same. >>>>> To support pause an endpoint will send and receive >>>> messages. I don't think "command-only"/"indication-only" >>>>> help because they again relate to a direction. e.g. to support >>>>> "sendonly" an endpoint sends commands PAUSE/RESUME and receives >>>>> indications PAUSED/REFUSEd. I think being >>>> explicit makes the description much easier. >>>> [BoB] Agree >>>> >>>> _______________________________________________ >>>> avtext mailing list >>>> avtext@ietf.org >>>> https://www.ietf.org/mailman/listinfo/avtext > From nobody Wed Sep 17 00:15:53 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3129A1A0336 for ; Wed, 17 Sep 2014 00:15:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w0MBJFCd7VtF for ; Wed, 17 Sep 2014 00:15:48 -0700 (PDT) Received: from sesbmg23.ericsson.net (sesbmg23.ericsson.net [193.180.251.37]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F338B1A0310 for ; Wed, 17 Sep 2014 00:15:47 -0700 (PDT) X-AuditID: c1b4fb25-f791c6d00000617b-0e-54193522d606 Received: from ESESSHC024.ericsson.se (Unknown_Domain [153.88.253.124]) by sesbmg23.ericsson.net (Symantec Mail Security) with SMTP id CB.C0.24955.22539145; Wed, 17 Sep 2014 09:15:46 +0200 (CEST) Received: from ESESSMB105.ericsson.se ([169.254.5.215]) by ESESSHC024.ericsson.se ([153.88.183.90]) with mapi id 14.03.0174.001; Wed, 17 Sep 2014 09:15:45 +0200 From: Bo Burman To: Bernard Aboba , "avtext@ietf.org" Thread-Topic: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 Thread-Index: AQHP0jN1uJj+/jLIEEmtXmUHB8gdz5wE3dZg Date: Wed, 17 Sep 2014 07:15:44 +0000 Message-ID: References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com>, <53F1DD5D.6030204@nteczone.com>, , <53F441C3.5050201@nteczone.com>, , <53FD7F8A.6060608@nteczone.com>, , <54051326.5090103@nteczone.com>, , , <5417AB01.2010801@nteczone.com>, In-Reply-To: Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.19] Content-Type: multipart/alternative; boundary="_000_BBE9739C2C302046BD34B42713A1E2A22E2CF922ESESSMB105erics_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrLLMWRmVeSWpSXmKPExsUyM+Jvja6SqWSIwdY3IhYf791gtdi/5DKz A5PH454zbB5LlvxkCmCK4rJJSc3JLEst0rdL4MqYcuwNe8HseYwVxyd3sjQw7m5j7GLk5JAQ MJF4+XkTO4QtJnHh3nq2LkYuDiGBo4wSu1f9hHKWMEo8+LufCaSKTUBDYv6Ou2DdIgIhEiva lrKC2MICbhLv3p+DirtL3Du2ig3CNpJY2/UMbAOLgKrEnNmrwep5BXwlFp6/A7XgOqvEqR+v WEASnAJWEtM+XgWzGQVkJe5/vwdmMwuIS9x6Mp8J4lQBiSV7zjND2KISLx//Y4WwFSXanzYw QtTnS3QfO88CsUxQ4uTMJywTGEVmIRk1C0nZLCRlEHEdiQW7P7FB2NoSyxa+Zoaxzxx4zIQs voCRfRWjaHFqcVJuupGxXmpRZnJxcX6eXl5qySZGYHwd3PJbdQfj5TeOhxgFOBiVeHgVXkuE CLEmlhVX5h5ilOZgURLnXXhuXrCQQHpiSWp2ampBalF8UWlOavEhRiYOTqkGRt0tjQ637e3d df5Wu+TGWf4rOBwafYjpjvzDR0+zYm22Pf4lu60/pzijhiHTv2/Zkx5NE5bbc4qVpL8GHDPn WhBdmfPh17ZFSX/Z3U+4GngntLtkL+GJmHrxxtR5B896xN9e982lp3LfDI29ySrBs32dNW7f UNvYOjHN/9SkVfqvO938NFwPKrEUZyQaajEXFScCAFgm8d+QAgAA Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/pfcfRsmVfzQ8yBkyb5NsyOQKjGo Subject: Re: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Sep 2014 07:15:52 -0000 --_000_BBE9739C2C302046BD34B42713A1E2A22E2CF922ESESSMB105erics_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Responses inline /Bo From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bernard Aboba Sent: den 17 september 2014 06:53 To: avtext@ietf.org Subject: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 Section 1 This document describes several scenarios in multimedia communication where a conferencing node or participant chooses to temporarily pause an incoming RTP [RFC3550] stream and later resume it when needed. The receiver does not need to terminate or inactivate the RTP session and start all over again by negotiating the session parameters, for example using SIP [RFC3261] with SDP Offer/Answer [RF= C3264]. Centralized nodes, like RTP Mixers or MCUs, which either uses logic based on voice activity, other measurements, or user input could reduce the resources consumed in both the sender and the network by temporarily pausing the RTP streams that aren't required by the RTP Mixer. [BA] There is another potential use case for a centralized node. Could str= eam pause/resume also be used to enable a centralized node to notify a rece= iver that it has chosen to pause a stream on its own (without being asked)?= For example, there are situations where an multi-stream SFU may wish to d= rop a layer (RTCP RRs or PLI indicates congestion). Today this is handled = via codec-specific messages (e.g. SEI layer drop). However, if it was des= ired to handle this in a codec-independent way, could a centralized node se= nd an unsolicited PAUSED (e.g. TMMBN =3D 0) message? [BoB] Yes, that is the intention. I could add some text in the introduction= about that. This is fully in line with the rest of the document. See for e= xample first part of section 5.3 "Media Sender Pausing"; An RTP stream sender can choose to pause the stream at any time. This can either be as a result of receiving a PAUSE, or be based on some local sender consideration. When it does, it sends a PAUSED indication, containing the available PauseID. If the stream was paused by a TMMBR 0, TMMBN 0 is used as PAUSED indication. What is said on PAUSED in the rest of this paragraph apply also to the use of TMMBN 0, except for PAUSED message parameters. Do you think that the text need further clarification? I see no problem add= ing explicit text regarding unsolicited sending of TMMBN 0. Section 4.2 It is the responsibility of an RTP stream receiver, who wants to pause or r= esume a stream from the sender(s), to transmit PAUSE and RESUME messages. A= n RTP stream sender who likes to pause itself, can simply do it. Any indica= tion that an RTP stream is paused is the responsibility of the RTP stream s= ender and may in some cases not even be needed by the stream receiver. [BA] Not sure I agree with this for the multi-stream transmission case. If= a sender stops sending a layer with no notification, then the receiver cou= ld be adversely affected. For example, it could be waiting for a spatial e= nhancement layer that never shows up. That is why we have SEI layer drop = messages, right? [BoB] If you refer to the sentence marked in red above, it was intended to = highlight a fact that was there already before this draft, not to specifica= lly allow something that was previously disallowed. Maybe that sentence cou= ld be changed into something like "An RTP stream sender who likes to pause = itself can often simply do it, but sometimes this will adversely affect the= receiver and an explicit indication that the RTP stream is paused may then= help"? Section 4.4 An RTP stream sender should not pause an SSRC that some receiver still wish= es to receive. The reason is that in RTP topologies where the stream is sha= red between multiple receivers, a single receiver on that shared network, i= ndependent of it being multicast, a mesh with joint RTP session or a transp= ort Translator based, must not single- handedly cause the stream to be paus= ed without letting all other receivers to voice their opinions on whether o= r not the stream should be paused. A consequence of this is that a newly jo= ining receiver, for example indicated by an RTCP Receiver Report containing= both a new SSRC and a CNAME that does not already occur in the session, fi= rstly needs to learn the existence of paused streams, and secondly should b= e able to resume any paused stream. Any single receiver wanting to resume a= stream should also cause it to be resumed. [BA] In many simulcast and MST implementations, the centralized unit utiliz= es sender-based congestion control, which means that it decides which strea= ms to send based on indications from the receiver such as packet loss, etc.= If there is substantial loss, the sender will adjust the streams it is s= ending. In implementations where the SFU uses a distinct SSRC for each sim= ulcast stream (as opposed to using the same SSRC but adjusting the resoluti= on/framerate), it may pause sending one SSRC and resume sending another (lo= wer bandwidth one). Where MST is in use, the sender may pause an enhanceme= nt layer and subsequently resume sending it when it has reason to believe t= hat there is sufficient bandwidth to handle it. Whether receiver "wishes t= o receive" a stream doesn't really enter into the sender's decision if it d= etermines that there isn't sufficient bandwidth available to send it succes= sfully. [BoB] Fully agree that bandwidth availability has higher precedence than an= y receiver's wishes. This is a typical case where "local considerations" ov= erride RTP stream receivers, as described in section 5.4. That is also one = of the very reasons to include the REFUSED indication in the draft. This sc= enario is also viable when using TMMBR/TMMBN; a RESUME signaled through TMM= BR>0 can be REFUSED using TMMBN 0 (likely indicating the RTP stream sender = itself owning the bitrate restriction), as described in section 5.5. I real= ize that the text is not clear on using the RTP stream sender's own SSRC as= the one owning the restriction in TMMBR/TMMBN signaling whenever "local co= nsiderations" apply, which I believe is useful here. I should probably add = text about that in a few places. Agree? --_000_BBE9739C2C302046BD34B42713A1E2A22E2CF922ESESSMB105erics_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Responses inline

/Bo

 <= /p>

From: avtext [= mailto:avtext-bounces@ietf.org] On Behalf Of Bernard Aboba
Sent: den 17 september 2014 06:53
To: avtext@ietf.org
Subject: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02

 

Section 1
 
   This document describes several
   scenarios in multimedia communication where a conferencing nod= e or
   participant chooses to temporarily pause an incoming RTP [RFC3550]
   stream and later resume it when needed.  The receiver doe= s not need
   to terminate or inactivate the RTP session and start all over = again
   by negotiating the session parameters, for example using SIP    [RFC3261] with SDP Offer/Answe= r [RFC3264].  
  Centralized nodes, like RTP Mixers or MCUs, which either uses logic<= br>    based on voice activity, other measurements, or user input cou= ld
   reduce the resources consumed in both the sender and the netwo= rk by
   temporarily pausing the RTP streams that aren't required by th= e RTP
   Mixer.
 
[BA] There is another potential use case for a centralized node.  Coul= d stream pause/resume also be used to enable a centralized node to notify a= receiver that it has chosen to pause a stream on its own (without being as= ked)?  For example, there are situations where an multi-stream SFU may wish to drop a layer (RTCP RRs or PLI indica= tes congestion).  Today this is handled via codec-specific messages (e= .g. SEI layer drop).   However, if it was desired to handle = this in a codec-independent way, could a centralized node send an unsolicited PAUSED (e.g. TMMBN =3D 0) message?

[BoB] Yes, that is = the intention. I could add some text in the introduction about that. This i= s fully in line with the rest of the document. See for example first part of section 5.3 “Media Sender Pausing”;

   An= RTP stream sender can choose to pause the stream at any time.

   Th= is can either be as a result of receiving a PAUSE, or be based on

   so= me local sender consideration.  When it does, it sends a PAUSED

   in= dication, containing the available PauseID.  If the stream was

   pa= used by a TMMBR 0, TMMBN 0 is used as PAUSED indication.  What is=

   sa= id on PAUSED in the rest of this paragraph apply also to the use of

    TMMBN 0, except for PAUSE= D message parameters.

Do you think that t= he text need further clarification? I see no problem adding explicit text r= egarding unsolicited sending of TMMBN 0.

 
Section 4.2
 
It is the responsibility of an RTP stream receiver, who wants to pause or r= esume a stream from the sender(s), to transmit PAUSE and RESUME messages. An RTP stream sender who likes to pause itself, c= an simply do it. Any indication that an RTP stream is paused is the = responsibility of the RTP stream sender and may in some cases not even be n= eeded by the stream receiver.
 
[BA] Not sure I agree with this for the multi-stream transmission case.&nbs= p; If a sender stops sending a layer with no notification, then the re= ceiver could be adversely affected.  For example, it could be waiting = for a spatial enhancement layer that never shows up.   That is why we have SEI layer drop messages, right?

[BoB] If you refer = to the sentence marked in red above, it was intended to highlight a fact th= at was there already before this draft, not to specifically allow something that was previously disallowed. Maybe that sentence could = be changed into something like “An RTP stream sender who likes to pau= se itself can often simply do it, but sometimes this will adversely affect = the receiver and an explicit indication that the RTP stream is paused may then help”?<= /b>


 
Section 4.4
 
An RTP stream sender should not pause an SSRC that some receiver still wish= es to receive. The reason is that in RTP topologies where the stream is sha= red between multiple receivers, a single receiver on that shared network, i= ndependent of it being multicast, a mesh with joint RTP session or a transport Translator based, must not si= ngle- handedly cause the stream to be paused without letting all other rece= ivers to voice their opinions on whether or not the stream should be paused= . A consequence of this is that a newly joining receiver, for example indicated by an RTCP Receiver Report= containing both a new SSRC and a CNAME that does not already occur in the = session, firstly needs to learn the existence of paused streams, and second= ly should be able to resume any paused stream. Any single receiver wanting to resume a stream should also = cause it to be resumed.
 
[BA] In many simulcast and MST implementations, the centralized unit utiliz= es sender-based congestion control, which means that it decides which strea= ms to send based on indications from the receiver such as packet loss, etc.=    If there is substantial loss, the sender will adjust the streams it is sending.  In implementations= where the SFU uses a distinct SSRC for each simulcast stream (as opposed t= o using the same SSRC but adjusting the resolution/framerate), it may = pause sending one SSRC and resume sending another (lower bandwidth one).  Where MST is in use, the sender may p= ause an enhancement layer and subsequently resume sending it when it has re= ason to believe that there is sufficient bandwidth to handle it.  Whet= her receiver "wishes to receive" a stream doesn't really enter into the sender's decision if it determines that ther= e isn't sufficient bandwidth available to send it successfully.

[BoB] Fully agree t= hat bandwidth availability has higher precedence than any receiver’s = wishes. This is a typical case where “local considerations” ove= rride RTP stream receivers, as described in section 5.4. That is also one of the= very reasons to include the REFUSED indication in the draft. This scenario= is also viable when using TMMBR/TMMBN; a RESUME signaled through TMMBR>= 0 can be REFUSED using TMMBN 0 (likely indicating the RTP stream sender itself owning the bitrate restriction), a= s described in section 5.5. I realize that the text is not clear on using t= he RTP stream sender’s own SSRC as the one owning the restriction in = TMMBR/TMMBN signaling whenever “local considerations” apply, which I believe is useful here. I should prob= ably add text about that in a few places. Agree?<= /p>


 
 

=  

 

 

--_000_BBE9739C2C302046BD34B42713A1E2A22E2CF922ESESSMB105erics_-- From nobody Wed Sep 17 07:13:48 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 982351A0460 for ; Wed, 17 Sep 2014 07:13:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.801 X-Spam-Level: X-Spam-Status: No, score=-1.801 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, J_CHICKENPOX_18=0.6, J_CHICKENPOX_38=0.6, J_CHICKENPOX_45=0.6, J_CHICKENPOX_46=0.6, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mXmDV2X7bLkY for ; Wed, 17 Sep 2014 07:13:40 -0700 (PDT) Received: from sessmg23.ericsson.net (sessmg23.ericsson.net [193.180.251.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AC1EC1A045F for ; Wed, 17 Sep 2014 07:13:39 -0700 (PDT) X-AuditID: c1b4fb2d-f793d6d000005356-f6-54199711f89b Received: from ESESSHC011.ericsson.se (Unknown_Domain [153.88.253.124]) by sessmg23.ericsson.net (Symantec Mail Security) with SMTP id 0A.87.21334.11799145; Wed, 17 Sep 2014 16:13:38 +0200 (CEST) Received: from ESESSMB105.ericsson.se ([169.254.5.215]) by ESESSHC011.ericsson.se ([153.88.183.51]) with mapi id 14.03.0174.001; Wed, 17 Sep 2014 16:13:37 +0200 From: Bo Burman To: Christian Groves , "avtext@ietf.org" Thread-Topic: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 Thread-Index: Ac+oI8943NA5z66dRdGqdkJ2oCY7RQSn2IaAAC2sUTAALZTUgABGai2QARodEgABAng3IAAejgIAAIUmrNACKTUMMAAW6lyAAAteQRAALXMRgAAUneaA Date: Wed, 17 Sep 2014 14:13:36 +0000 Message-ID: References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com> <53F1DD5D.6030204@nteczone.com> <53F441C3.5050201@nteczone.com> <53FD7F8A.6060608@nteczone.com> <54051326.5090103@nteczone.com> <5417AB01.2010801@nteczone.com> <5419284D.70804@nteczone.com> In-Reply-To: <5419284D.70804@nteczone.com> Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.146] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrMLMWRmVeSWpSXmKPExsUyM+Jvja7QdMkQg7ZzTBYf791gtfjyvpHF gcljyZKfTB4rzs9kCWCK4rJJSc3JLEst0rdL4MrYtvQvU8GqmYwVHUsXMTUw/q/qYuTkkBAw kXi3eCM7hC0mceHeerYuRi4OIYGjjBKzvlxigXCWMErs7F3KAlLFJqAhMX/HXUYQW0QgWmJr z2dmEFtYwFVi6qN7zBBxN4lfd3ayQdhNjBI/d/mA2CwCqhIrPr9n7WLk4OAV8JU4v08aYv4e VomvD+YygdRwCmhJfJ22EsxmFJCVuP/9HtheZgFxiVtP5jNBXCogsWTPeWYIW1Ti5eN/rBC2 ksSPDZeg6nUkFuz+xAZha0ssW/garJ5XQFDi5MwnLBMYRWchGTsLScssJC2zkLQsYGRZxSha nFpcnJtuZKyXWpSZXFycn6eXl1qyiREYKwe3/Nbdwbj6teMhRgEORiUeXoXXEiFCrIllxZW5 hxilOViUxHkXnZsXLCSQnliSmp2aWpBaFF9UmpNafIiRiYNTqoFRmG3fRfFlTl8eJ8jEGpSI R5221Dreb3bFRahJRn7By/QluWyMX/Iece2OyP4iVPOK56dMddCllfEW3Xt+rLnwhmf+vYXd 7/xUUgsXlD4M+T3ff+n7XUq3NSU33TN2SV54eNsJpySr43rv90nI85X06WpmrYn9zTPpf7en ddCvpRbFL+RnyrUpsRRnJBpqMRcVJwIAcqpAk3YCAAA= Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/O4hJoWW4msWLUwBpphAYf9qeBIY Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Sep 2014 14:13:43 -0000 Thank you! I'll amend the text accordingly, including the additional text i= n the note on TMMBR/TMMBN in section 9 and the IANA section. > -----Original Message----- > From: Christian Groves [mailto:Christian.Groves@nteczone.com] > Sent: den 17 september 2014 08:21 > To: Bo Burman; avtext@ietf.org > Subject: Re: [avtext] WGLC for draft-ietf-avtext-rtp-stream-pause-02 >=20 > Hello Bo, >=20 > Please see my replies below. >=20 > Regards, Christian >=20 > On 16/09/2014 7:12 PM, Bo Burman wrote: > > Hi Christian, > > > > Thank you for good and constructive comments! My responses inline. > > > > Note that I need guidance on whether or not defined 'config' attribute = values need to be somehow mentioned in IANA > section, and in that case how to describe it. A reference to the table in= Figure 6? Examples from other RFCs are welcome! > > > > Also, while editing the first part of section 9, I started to wonder if= this specification can really promise that existing 'ccm > tmmbr' signaling means TMMBR and TMMBN with value 0 is supported and will= be treated correctly in all existing > implementations? Should we not at least say there is no guarantee TMMBR a= nd TMMBN implementations pre-dating this > specification work exactly as described when used with a bitrate value of= 0? > [CNG] The later seems a safer assumption. > > > > Cheers, > > /Bo > > > > ..snip > >> 3) Cl.9 Para.1: With respect to the use of the rtcp-fb attribute I > >> think the text should say "/MUST only be used as an SDP media attribut= e and MUST NOT be provided at the session > level/". The use of "Recommended" > >> implies an option however there's a must against the use at session le= vel, so really there is no option. > > [BoB] I agree that "recommend" and "must" do not match. The current tex= t in that sentence is a bit poorly written. I > think it tries to both describe what is said in RFC 4585 and 5104 about t= he rtcp-fb attribute in general, as well as saying that > it applies also for this specification. That statement is redundant. RFC = 4585 section 4.2 is totally clear: "The 'rtcp-fb' > attribute MUST only be used as an SDP media attribute and MUST NOT be pro= vided at the session level". I think the > sentence can be removed. > [CNG] OK > > > >> 4) General Nit: Sometimes "hold off period" is used, sometimes "hold o= ff time" is used. Could be consistent. > > [BoB] There are also sometimes "wait period" or "wait time". I'll chang= e to "hold-off period" throughout. > [CNG] OK > > > > ..snip.. > >> 6) Cl.9 last para pg 28: "/All implementations of this specification M= UST be able to receive all// > >> // messages defined in Section 8/". Given that the config parameter > >> allows partial implementation then this statement isn't true. > > [BoB] My intent was to require that all implementations are able to at = least receive _and ignore_ all messages from > section 8, regardless of config. That would be in line with section 4.2 o= f RFC 4585: "RTP senders MUST be prepared to > receive any kind of RTCP FB messages and MUST silently discard all those= RTCP FB messages that they do not > understand", but is thus strictly redundant. I suggest to simply remove t= he sentence since it does not add anything. > [CNG] OK > > ..snip.. > > > >> > >> 8) Cl.9.2: " /First, the "config" attribute and its message directions= are// > >> // interpreted based on the node receiving the SDP./" Should this be > >> the node "providing" the SDP as per cl.9.1? > > [BoB] No. Declarative use of SDP seems to have this difference in inter= pretation of the SDP. First, see section 3.4 of RFC > 4566 on Multicast Session Announcement that says "remote participants can= use the session description to start the tools > required to participate in the session". Second, compare with section 6 o= f RFC 4566 where a=3Drecvonly is described as > "specifies that the tools should be started in a receive-only mode". This= indicates to me that the text currently in 9.2 is > correct. > [CNG] Yes, seems you're right. > > > >> 9) Cl.11: Does the config parameter need to be included here? Also per= haps 4) and 5) should say "pause feedback > type" > >> as per the description of the "type" element. > > [BoB] 'config' should be in 3, yes. Don't know about config values. Gui= dance appreciated! > [CNG] You may want to be more formal in the way the updates are specified= to make it clear to IANA what exactly they > have to do, e.g. > similar to RFC5104. >=20 > 11. IANA Considerations > This specification requests the following registrations from IANA >=20 > 1) A new value for media stream pause / resume to be registered with IANA= in the "FMT Values for RTPFB Payload > Types" registry located at the time of publication at: > http://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml >=20 > Value: 9 > Name: PAUSE RESUME > Long Name: Media Pause Resume > Reference: This RFC. >=20 > 2) A new value "pause" to be registered with IANA in the "Codec Control M= essages" registry located at the time of > publication at: > http://www.iana.org/assignments/sdp-parameters/sdp-parameters.xhtml#sdp-p= arameters-19 >=20 > Name Long Name Value Reference > -------------- --------------------------------- ----- --------- > PAUSERES Pause / Resume Media Sending 9 This RFC >=20 > With regards to the "no wait" and "config" parameters I don't think you n= eed a registry for these are they don't need to > be extensible. RFCs > 4585 and 5104 don't register these types of sub-parameters. >=20 > For 4 & 5 'pause' Types, I'm not sure a registry is needed for these. I w= ould assume that any new value would be as a > result of a revision to the pause/resume RFC. If you set up a registry fo= r these 'pause' types then you have to specify the > process used in order to update it. >=20 >=20 > > > >> > >> Regards, Christian > >> > >> > >> On 16/09/2014 12:29 AM, Bo Burman wrote: > >>> Christian, Roni, all, > >>> > >>> Please find enclosed a draft update implementing Christian's > >>> suggested changes below. Affected sections are 9 and > >> 10.1. > >>> Please have a look and let me know if the changes are acceptable and = consistent with our discussions. > >>> > >>> Cheers, > >>> /Bo > >>> > >>>> -----Original Message----- > >>>> From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bo > >>>> Burman > >>>> Sent: den 5 september 2014 11:44 > >>>> To: Christian Groves; avtext@ietf.org > >>>> Subject: Re: [avtext] WGLC for > >>>> draft-ietf-avtext-rtp-stream-pause-02 > >>>> > >>>> Hi Christian, > >>>> > >>>> More inline. > >>>> > >>>> As a summary, I must conclude that Christian's proposal has > >>>> consistency and clarity benefits in SDP signaling compared to what > >>>> is currently in the text, and suggest that the text > >> should be changed accordingly: > >>>> * The "dir" parameter of "ccm pause" is replaced by "config" as sugg= ested below. > >>>> * The separate "ccm paused" parameter is removed, since support of > >>>> PAUSED will instead be indicated through > >> "config" > >>>> BR > >>>> /Bo > >>>> > >>>>> -----Original Message----- > >>>>> From: Christian Groves [mailto:Christian.Groves@nteczone.com] > >>>>> Sent: den 2 september 2014 02:45 > >>>>> To: Bo Burman; avtext@ietf.org > >>>>> Subject: Re: [avtext] WGLC for > >>>>> draft-ietf-avtext-rtp-stream-pause-02 > >>>>> > >>>>> Hello Bo, > >>>>> > >>>>> Please see my replies below. > >>>>> > >>>>> Regards, Christian > >>>>> > >>>>> On 1/09/2014 9:51 PM, Bo Burman wrote: > >>>>>> ..snip.. > >>>>>> I think the following two main options are reasonable ways forward= : > >>>>>> > >>>>>> 1) Remove the "paused" SDP parameter entirely, and with it the > >>>>>> possibility to implement support of only the local pause > >>>>>> indication > >>>>>> > >>>>>> 2) Make the text consistently express that "paused" refers to > >>>>>> capability for that limited functionality. For SDP > >>>>>>> offer/answer, we then have a few more choices regarding the relat= ion between "pause" and "paused": > >>>>>>>> a) an offer expressing support for this specification MUST > >>>>>>>> contain only one of "pause" or "paused", and an offer > >>>>>>> with "pause" is possible to restrict by answering with "paused", > >>>>>>> but an offer with the limited "paused" cannot be upgraded to > >>>>>>> "pause" in the answer. May possibly cause problems with > >>>>> declarative use; guidance appreciated. > >>>>>>>> b) "pause" and "paused" are kept separate (what current text > >>>>>>>> mostly does, except for some confusion that must be corrected > >>>>>>>> throughout if this option is chosen); the offer MAY contain > >>>>>>>> either or both, while the answer MUST choose one and MUST NOT > >>>>>>>> add anything that was not in the offer > >>>>>>> [CNG] I wasn't following this closely when 'paused' was added so > >>>>>>> I'm not sure about removing it. It would simplify things if it wa= s removed. > >>>>>>> I think what would need to be added if local pause was supported > >>>>>>> without signalling is that a node supporting this draft must at > >>>>>>> minimum support the reception of a 'paused' indication and the > >>>>>>> sending of 'paused' if the node supports a paused state. There > >>>>>>> would probably need to be an extra value in direction > >>>>> indicating that PAUSE/RESUME is not sent or received. > >>>>>> [BoB] You mean using additional direction signaling for pause > >>>>>> instead of the tag "paused"? I don't see how that goes > >>>>> with your statement "supported without signaling" a few sentences b= ack, since that is then also explicit signaling? > >>>>> [CNG] Yes an additional direction. I was thinking about how to > >>>>> specify "local pause" where the endpoint didn't support > >>>>> sendonly,recvonly or sendrecv. It wouldn't be correct for the > >>>>> endpoint to send "a=3Drtcp-fb:* ccm pause" because the > >> default is "sendrecv". > >>>> [BoB] Thinking this through again. It is possible to make the > >>>> currently proposed signaling in the draft consistent, but only if > >>>> capability and indication of pause and local pause are changed to > >>>> be totally independent functions. The 8 > >> configurations you list are then possible to express, using direction > >> parameter of both pause and paused ([] indicates optional). > >>>> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive > >>>> (PAUSED,RESUMED,PAUSED,REFUSED) > >>>> a=3Drtcp-fb:* ccm pause [dir=3Dsendrecv] > >>>> a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] > >>>> > >>>> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) > >>>> a=3Drtcp-fb:* ccm pause dir=3Dsendonly > >>>> a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] > >>>> > >>>> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) > >>>> a=3Drtcp-fb:* ccm pause dir=3Drecvonly > >>>> a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] > >>>> > >>>> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) > >>>> a=3Drtcp-fb:* ccm pause dir=3Drecvonly > >>>> a=3Drtcp-fb:* ccm paused dir=3Dsendonly > >>>> > >>>> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) > >>>> a=3Drtcp-fb:* ccm pause dir=3Dsendonly > >>>> a=3Drtcp-fb:* ccm paused dir=3Drecvonly > >>>> > >>>> 6) Send(PAUSED) Receive(PAUSED) > >>>> a=3Drtcp-fb:* ccm paused [dir=3Dsendrecv] > >>>> > >>>> 7) Send() Receive(PAUSED) > >>>> a=3Drtcp-fb:* ccm paused dir=3Drecvonly > >>>> > >>>> 8) Send(PAUSED) Receive() > >>>> a=3Drtcp-fb:* ccm paused dir=3Dsendonly > >>>> > >>>> That split would however also mean there is a possibility to > >>>> support PAUSE but not PAUSED, which I believe is an undesirable side= -effect and definitely not in line with the > current text. > >>>> > >>>> As a summary, I must agree that your proposal to use a "config" > >>>> parameter with an explicit listing of supported messages and > >>>> directions is indeed much easier to describe and is > >> beneficial for text clarity. > >>>>>>> Maybe an option 2c: If local pause is kept and it needs to be > >>>>>>> supported by signalling there actually appears to be 8 > >>>>>>> combinations of sent and received messages. I assume a node > >>>>>>> supporting the sending and/or reception of PAUSE must also > >>>>>>> support RESUME. A node supporting the reception of PAUSE/RESUME > >>>>>>> must also > >>>>> support sending PAUSED and REFUSED. > >>>>>> [BoB] An observation: I see you more or less consistently using > >>>>>> "REFUSED" instead of the currently defined tag > >>>>> "REFUSE". This is actually consistent with it being an > >>>>> indication/response rather than a command, and thus probably a > >>>>> better name. Do you suggest that we change the > >>>> name to "REFUSED" in the draft? > >>>>> [CNG] I wasn't proposing the change, I guess I just aligned "paused= " and "refused". I'd be OK with changing it. > >>>> [BoB] Unless someone else objects, I will change REFUSE to REFUSED > >>>> throughout, to better reflect that it is an indication, not a comman= d. > >>>> > >>>>>>> The combinations a Node can support are: > >>>>>>> > >>>>>>> 1) Send(PAUSE,RESUMED,PAUSED,REFUSE) Receive > >>>>>>> (PAUSED,RESUMED,PAUSED,REFUSED) > >>>>>>> 2) Send(PAUSE, RESUME, PAUSED) Receive (PAUSED, REFUSED) > >>>>>>> 3) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME, PAUSED) > >>>>>>> 4) Send(PAUSED,REFUSED) Receive (PAUSE, RESUME) > >>>>>>> 5) Send(PAUSE, RESUME) Receive (PAUSED, REFUSED) > >>>>>>> 6) Send(PAUSED) Receive(PAUSED) > >>>>>>> 7) Send() Receive(PAUSED) > >>>>>>> 8) Send(PAUSED) Receive() > >>>>>>> > >>>>>>> Would it be easier to simply signal the messages that are > >>>>>>> supported rather than two parameters with a direction parameters? > >>>>>>> e.g. the draft could have the above list of values. If a node > >>>>>>> supported both the sending and reception of > >>>>>>> PAUSE/RESUME/PAUSED/REFUSED then it could signal e.g. > >>>>>>> a=3Drtcp-fb:98 ccm pause > >>>>> config=3D1 . Part of the confusion comes from the interaction > >>>>> between the parameters. This would remove the > >>>> interaction. > >>>>>>> It might make describing the SDP O/A procedures easier. > >>>>>>> e.g. > >>>>>>> On receiving an Offer with: > >>>>>>> config=3D1 the answerer may reply with config=3D1, 2, 3, 4, 5, 6,= 7 or 8. > >>>>>>> config=3D2 the answerer may reply with config=3D3, 4, 5, 6, 7 or = 8. > >>>>>>> config=3D3 the answerer may reply with config=3D2, 4, 5, 6, 7 or = 8. > >>>>>>> config=3D4 the answerer may reply with config=3D5, 6, 7 or 8. > >>>>>>> config=3D5 the answerer may reply with config=3D4, 6, 7 or 8. > >>>>>>> config=3D6 the answerer may reply with config=3D6, 7 or 8. > >>>>>>> config=3D7 the answerer may reply with config=3D8 > >>>>>>> config=3D8 the answerer may reply with config=3D7 In all cases th= e > >>>>>>> answerer may reply with a completely removed "pause" > >>>>>>> parameter. > >>>>>>> > >>>>>>> An answerer cannot add extra messages to what is provided in the = Offer. > >>>>>>> For example: If an Offer indicates config=3D6 an Answer cannot > >>>>>>> reply with > >>>>>>> config=3D3 indicating that it has the capability to receive PAUSE > >>>>>>> and RESUME. An answerer may remove messages that it does not supp= ort. > >>>>>>> For > >>>>>>> example: if an Offer indicates config=3D6 an Answer may reply wit= h > >>>>>>> config=3D7 indicating that it can only receive PAUSED. > >>>>>> [BoB] I get your point. There is significant inherent complexity > >>>>>> in this that your proposal makes explicit and clarifies. I > >>>>> would like to simplify and clarify this further by reducing the all= owed configurations to be 1, 4, 5 and 6: > >>>>>> 1) Full support of sending and receiving all messages ("ccm pause"= without direction) > >>>>>> As you say above, acceptable Answers include 1, 4, 5 or 6, or > >>>>>> (of > >>>>>> course) removing "ccm pause" entirely > >>>>>> 4) Pause command receiver, sending result indications ("ccm pause = dir=3Drecvonly") > >>>>>> Acceptable Answers include 5, 6, or removing ccm pause entirely > >>>>>> 5) Pause command sender, receiving result indications ("ccm pause = dir=3Dsendonly") > >>>>>> Acceptable Answers include 4, 6, or removing ccm pause entirely > >>>>>> 6) Local pause support only ("ccm paused", and I then suggest > >>>>>> removing direction from paused; either you support it or > >>>>> you don't) > >>>>>> Acceptable Answers include 6 or removing ccm paused entirely > >>>>> [CNG] So to remove 2 and 3 the assumption must be that local pause > >>>>> is not supported by a sendonly or receive only endpoint. Is that co= rrect? > >>>>> It would seem that if local pause was to be supported then 2 and 3 = should be selected rather than 4 and 5. > >>>>> To remove 7 and 8 the assumption must be that endpoints > >>>>> supporting this draft must support local pause? Otherwise there's > >>>>> no way of saying "I won't send anything but if you do > >>>> a local pause let me know". > >>>> > >>>> [BoB] I agree the 8 configurations you list makes sense to keep. > >>>> They reflect the current text better than what I suggested. > >>>> > >>>>>> If those clarifications you list above on O/A and what messages > >>>>>> are sent and/or received are made in the document, do > >>>>> you still think we need to introduce the "config" concept, or will > >>>>> the direction parameter to "pause" (as indicated in my shortened li= st above) be clear enough? > >>>>> [CNG] I think having "paused" as a separate parameter as in your > >>>>> proposal 6 just complicates things. Once you have two parameters > >>>>> then we come back to specifying the interaction > >>>> between them. E.g. If A sends SDP "a=3Drtcp-fb:* ccm pause" > >>>>> if B only supports local pause does it reply back with a different > >>>>> parameter "a=3Drtcp-fb* ccm paused"? If so then it wouldn't make > >>>>> sense for an endpoint to send both "pause" and > >>>> "paused". > >>>> > >>>> [BoB] As said above, just signaling ccm pause would have to mean > >>>> that paused is not supported, so there would be no way to fall back > >>>> to local pause, which is undesirable. Your "config" is > >> better. > >>>>>> I wonder, is it rather the notion of "direction" that becomes > >>>>>> confusing, since "recvonly" actually includes sending > >>>>> messages, only those messages are not "PAUSE" and "RESUME"? In > >>>>> that case, could we call it something else than "direction"; like > >>>>> "dir=3Dsendonly" -> "command-only" and "dir=3Drecvonly" -> > >>>> "indication-only"? > >>>>> [CNG] Yes I think the direction is confusing considering that for > >>>>> pause it's opposite the RTP flow direction, for paused its the same= . > >>>>> To support pause an endpoint will send and receive > >>>> messages. I don't think "command-only"/"indication-only" > >>>>> help because they again relate to a direction. e.g. to support > >>>>> "sendonly" an endpoint sends commands PAUSE/RESUME and receives > >>>>> indications PAUSED/REFUSEd. I think being > >>>> explicit makes the description much easier. > >>>> [BoB] Agree > >>>> > >>>> _______________________________________________ > >>>> avtext mailing list > >>>> avtext@ietf.org > >>>> https://www.ietf.org/mailman/listinfo/avtext > > From nobody Wed Sep 17 08:15:51 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AE1191A045D for ; Wed, 17 Sep 2014 08:15:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.551 X-Spam-Level: X-Spam-Status: No, score=-3.551 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-1.652, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id t4PzINBnhquU for ; Wed, 17 Sep 2014 08:15:44 -0700 (PDT) Received: from BLU004-OMC1S38.hotmail.com (blu004-omc1s38.hotmail.com [65.55.116.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0731F1A030C for ; Wed, 17 Sep 2014 08:15:40 -0700 (PDT) Received: from BLU181-W71 ([65.55.116.8]) by BLU004-OMC1S38.hotmail.com with Microsoft SMTPSVC(7.5.7601.22724); Wed, 17 Sep 2014 08:15:39 -0700 X-TMN: [jNGrgXE2kSZNRZB1hmuwBwTOlthx7x91] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_849b8d1c-c0e6-4fae-958b-c9debbb9eadb_" From: Bernard Aboba To: Bo Burman , "avtext@ietf.org" Date: Wed, 17 Sep 2014 08:15:39 -0700 Importance: Normal In-Reply-To: References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com>, , <53F1DD5D.6030204@nteczone.com>, , , , <53F441C3.5050201@nteczone.com>, , , , <53FD7F8A.6060608@nteczone.com>, , , , <54051326.5090103@nteczone.com>, , , , , , <5417AB01.2010801@nteczone.com>, , , , MIME-Version: 1.0 X-OriginalArrivalTime: 17 Sep 2014 15:15:39.0782 (UTC) FILETIME=[3D997260:01CFD28A] Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/D6l2rQ5ICPM14NJcH__PxvoMWDk Subject: Re: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Sep 2014 15:15:50 -0000 --_849b8d1c-c0e6-4fae-958b-c9debbb9eadb_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Comments below.=20 From: bo.burman@ericsson.com To: bernard_aboba@hotmail.com=3B avtext@ietf.org Subject: RE: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 Date: Wed=2C 17 Sep 2014 07:15:44 +0000 =0A= =0A= =0A= =0A= =0A= =0A= =0A= =0A= Responses inline=0A= /Bo=0A= =0A= =0A= =0A= =0A= From: avtext [mailto:avtext-bounces@ietf.org]=0A= On Behalf Of Bernard Aboba =0A= Sent: den 17 september 2014 06:53 =0A= To: avtext@ietf.org =0A= Subject: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02=0A= =0A= =0A= =0A= =0A= Section 1 =0A= =20 =0A= This document describes several =0A= scenarios in multimedia communication where a conferencing node or =0A= participant chooses to temporarily pause an incoming RTP [RFC3550] =0A= stream and later resume it when needed. The receiver does not need =0A= to terminate or inactivate the RTP session and start all over again =0A= by negotiating the session parameters=2C for example using SIP =0A= [RFC3261] with SDP Offer/Answer [RFC3264]. =0A= =20 =0A= Centralized nodes=2C like RTP Mixers or MCUs=2C which either uses logic =0A= based on voice activity=2C other measurements=2C or user input could =0A= reduce the resources consumed in both the sender and the network by =0A= temporarily pausing the RTP streams that aren't required by the RTP =0A= Mixer. =0A= =20 =0A= [BA] There is another potential use case for a centralized node. Could str= eam pause/resume also be used to enable a centralized node to notify a rece= iver that it has chosen to pause a stream on its own (without being asked)?= For example=2C there are situations=0A= where an multi-stream SFU may wish to drop a layer (RTCP RRs or PLI indica= tes congestion). Today this is handled via codec-specific messages (e.g. S= EI layer drop). However=2C if it was desired to handle this in a codec-in= dependent way=2C could a centralized=0A= node send an unsolicited PAUSED (e.g. TMMBN =3D 0) message?=0A= [BoB] Yes=2C that is the intention. I could add some text in the introducti= on about that. This is fully in line with the rest of the document. See for= example=0A= first part of section 5.3 =93Media Sender Pausing=94=3B=0A= An RTP stream sender can choose to pause the stream at any time.=0A= This can either be as a result of receiving a PAUSE=2C or be based on=0A= some local sender consideration. When it does=2C it sends a PAUSED=0A= indication=2C containing the available PauseID. If the stream was=0A= paused by a TMMBR 0=2C TMMBN 0 is used as PAUSED indication. What is=0A= said on PAUSED in the rest of this paragraph apply also to the use of=0A= TMMBN 0=2C except for PAUSED message parameters.=0A= Do you think that the text need further clarification? I see no problem add= ing explicit text regarding unsolicited sending of TMMBN 0. [BA] Yes=2C some clarification might be helpful in the case where the PAUSE= D is unsolicited. For example=2C is there any reply to an unsolicited TMMB= N 0?=0A= =20 =0A= Section 4.2 =0A= =20 =0A= It is the responsibility of an RTP stream receiver=2C who wants to pause or= resume a stream from the sender(s)=2C to transmit PAUSE and RESUME message= s.=0A= An RTP stream sender who likes to pause itself=2C can simply do it. Any ind= ication that an RTP stream is paused is the responsibility of the RTP strea= m sender and may in some cases not even be needed by the stream receiver. =0A= =20 =0A= [BA] Not sure I agree with this for the multi-stream transmission case. If= a sender stops sending a layer with no notification=2C then the receiver c= ould be adversely affected. For example=2C it could be waiting for a spati= al enhancement layer that never shows=0A= up. That is why we have SEI layer drop messages=2C right? =0A= =0A= [BoB] If you refer to the sentence marked in red above=2C it was intended t= o highlight a fact that was there already before this draft=2C not to speci= fically=0A= allow something that was previously disallowed. Maybe that sentence could = be changed into something like =93An RTP stream sender who likes to pause i= tself can often simply do it=2C but sometimes this will adversely affect th= e receiver and an explicit indication=0A= that the RTP stream is paused may then help=94? [BA] That would be helpful=2C yes. =0A= =0A= =20 =0A= Section 4.4 =0A= =20 =0A= An RTP stream sender should not pause an SSRC that some receiver still wish= es to receive. The reason is that in RTP topologies where the stream is sha= red between multiple receivers=2C a single receiver on that shared network= =2C independent of it being multicast=2C=0A= a mesh with joint RTP session or a transport Translator based=2C must not = single- handedly cause the stream to be paused without letting all other re= ceivers to voice their opinions on whether or not the stream should be paus= ed. A consequence of this is that=0A= a newly joining receiver=2C for example indicated by an RTCP Receiver Repo= rt containing both a new SSRC and a CNAME that does not already occur in th= e session=2C firstly needs to learn the existence of paused streams=2C and = secondly should be able to resume any=0A= paused stream. Any single receiver wanting to resume a stream should also = cause it to be resumed.=0A= =0A= =20 =0A= [BA] In many simulcast and MST implementations=2C the centralized unit util= izes sender-based congestion control=2C which means that it decides which s= treams to send based on indications from the receiver such as packet loss= =2C etc. If there is substantial loss=2C=0A= the sender will adjust the streams it is sending. In implementations wher= e the SFU uses a distinct SSRC for each simulcast stream (as opposed to usi= ng the same SSRC but adjusting the resolution/framerate)=2C it may pause se= nding one SSRC and resume sending=0A= another (lower bandwidth one). Where MST is in use=2C the sender may paus= e an enhancement layer and subsequently resume sending it when it has reaso= n to believe that there is sufficient bandwidth to handle it. Whether rece= iver "wishes to receive" a stream=0A= doesn't really enter into the sender's decision if it determines that ther= e isn't sufficient bandwidth available to send it successfully.=0A= =0A= [BoB] Fully agree that bandwidth availability has higher precedence than an= y receiver=92s wishes. This is a typical case where =93local considerations= =94 override=0A= RTP stream receivers=2C as described in section 5.4. That is also one of t= he very reasons to include the REFUSED indication in the draft. This scenar= io is also viable when using TMMBR/TMMBN=3B a RESUME signaled through TMMBR= >0 can be REFUSED using TMMBN 0 (likely=0A= indicating the RTP stream sender itself owning the bitrate restriction)=2C= as described in section 5.5. I realize that the text is not clear on using= the RTP stream sender=92s own SSRC as the one owning the restriction in TM= MBR/TMMBN signaling whenever =93local=0A= considerations=94 apply=2C which I believe is useful here. I should probab= ly add text about that in a few places. Agree? [BA] Yes=2C I agree. =0A= =0A= =20 =0A= =0A= =0A= =20 =0A= =0A= =0A= =0A= =0A= = --_849b8d1c-c0e6-4fae-958b-c9debbb9eadb_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Comments below. =3B

<= div>
From: bo.burman@ericsson.com
To: bernard_abo= ba@hotmail.com=3B avtext@ietf.org
Subject: RE: [avtext] Review of draft= -ietf-avtext-rtp-stream-pause-02
Date: Wed=2C 17 Sep 2014 07:15:44 +0000=

=0A= =0A= =0A= =0A= =0A= =0A= =0A=
=0A=

Respo= nses inline

=0A=

/Bo

=0A=

 = =3B

=0A=
=0A=
=0A=
=0A=

From: avtext [mailto:avtext-bounces@ietf.org]=0A= On Behalf Of Bernard Aboba
=0A= Sent: den 17 september 2014 06:53
=0A= To: avtext@ietf.org
=0A= Subject: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02

=0A=
=0A=
=0A=

 =3B

=0A=
=0A=

Section 1
=0A=  =3B
=0A=  =3B =3B This document describes several
=0A=  =3B =3B scenarios in multimedia communication where a conferencing= node or
=0A=  =3B =3B participant chooses to temporarily pause an incoming RTP [= RFC35= 50]
=0A=  =3B =3B stream and later resume it when needed. =3B The receiv= er does not need
=0A=  =3B =3B to terminate or inactivate the RTP session and start all o= ver again
=0A=  =3B =3B by negotiating the session parameters=2C for example using= SIP
=0A=  =3B =3B [RFC3261= ] with SDP Offer/Answer [RFC3264].
=0A=  =3B
=0A=  =3B Centralized nodes=2C like RTP Mixers or MCUs=2C which either uses = logic
=0A=  =3B =3B based on voice activity=2C other measurements=2C or user i= nput could
=0A=  =3B =3B reduce the resources consumed in both the sender and the n= etwork by
=0A=  =3B =3B temporarily pausing the RTP streams that aren't required b= y the RTP
=0A=  =3B =3B Mixer.
=0A=  =3B
=0A= [BA] There is another potential use case for a centralized node. =3B Co= uld stream pause/resume also be used to enable a centralized node to notify= a receiver that it has chosen to pause a stream on its own (without being = asked)? =3B For example=2C there are situations=0A= where an multi-stream SFU may wish to drop a layer (RTCP RRs or PLI indica= tes congestion). =3B Today this is handled via codec-specific messages = (e.g. SEI layer drop). =3B =3B =3BHowever=2C if it was desired = to handle this in a codec-independent way=2C could a centralized=0A= node send an unsolicited =3BPAUSED (e.g. TMMBN =3D 0) message?

=0A=

[BoB] Yes=2C that is the intention. I could add some text in the introduct= ion about that. This is fully in line with the rest of the document. See fo= r example=0A= first part of section 5.3 =93Media Sender Pausing=94=3B

= =0A=

 =3B =3B An= RTP stream sender can choose to pause the stream at any time.

= =0A=

 =3B =3B Th= is can either be as a result of receiving a PAUSE=2C or be based on<= /p>=0A=

 =3B =3B so= me local sender consideration. =3B When it does=2C it sends a PAUSED

=0A=

 =3B =3B in= dication=2C containing the available PauseID. =3B If the stream was

=0A=

 =3B =3B pa= used by a TMMBR 0=2C TMMBN 0 is used as PAUSED indication. =3B What is<= /span>

=0A=

 =3B =3B sa= id on PAUSED in the rest of this paragraph apply also to the use of<= /p>=0A=

 =3B =3B  =3BTMMBN= 0=2C except for PAUSED message parameters.

=0A=

Do you think that the text need further clarification? I see no problem ad= ding explicit text regarding unsolicited sending of TMMBN 0.=


[BA] Yes=2C some =3B= clarification=  =3Bmight be helpful in the case whe= re the PAUSED is unsolicited.  =3BFor example=2C is there any reply to = an unsolicited TMMBN 0?

=0A=

 =3B
=0A= Section 4.2
=0A=  =3B
=0A= It is the responsibility of an RTP stream receiver=2C who wants to pause or= resume a stream from the sender(s)=2C to transmit PAUSE and RESUME message= s.=0A= An RTP stream sender who likes to pause itself= =2C can simply do it. Any indication that an RTP stream is paused is= the responsibility of the RTP stream sender and may in some cases not even= be needed by the stream receiver.
=0A=  =3B
=0A= [BA] Not sure I agree with this for the multi-stream transmission case.&nbs= p=3B If =3Ba sender stops sending a layer with no notification=2C then = the receiver could be adversely affected. =3B For example=2C it could b= e waiting for a spatial enhancement layer that never shows=0A= up. =3B =3B That is why we have SEI layer drop messages=2C right? = =0A=

=0A=

[BoB] If you refer to the sentence marked in red above=2C it was intended = to highlight a fact that was there already before this draft=2C not to spec= ifically=0A= allow something that was previously disallowed. Maybe that sentence could = be changed into something like =93An RTP stream sender who likes to pause i= tself can often simply do it=2C but sometimes this will adversely affect th= e receiver and an explicit indication=0A= that the RTP stream is paused may then help=94?


[BA] That would be helpful=2C yes. =3B<= /p>=0A=


=0A=  =3B
=0A= Section 4.4
=0A=  =3B
=0A= An RTP stream sender should not pause an SSRC that some receiver still wish= es to receive. The reason is that in RTP topologies where the stream is sha= red between multiple receivers=2C a single receiver on that shared network= =2C independent of it being multicast=2C=0A= a mesh with joint RTP session or a transport Translator based=2C must not = single- handedly cause the stream to be paused without letting all other re= ceivers to voice their opinions on whether or not the stream should be paus= ed. A consequence of this is that=0A= a newly joining receiver=2C for example indicated by an RTCP Receiver Repo= rt containing both a new SSRC and a CNAME that does not already occur in th= e session=2C firstly needs to learn the existence of paused streams=2C and = secondly should be able to resume any=0A= paused stream. Any single receiver wanting to resume a stream should also = cause it to be resumed.=0A=
=0A=  =3B
=0A= [BA] In many simulcast and MST implementations=2C the centralized unit util= izes sender-based congestion control=2C which means that it decides which s= treams to send based on indications from the receiver such as packet loss= =2C etc. =3B =3B If there is substantial loss=2C=0A= the sender will adjust the streams it is sending. =3B In implementatio= ns where the SFU uses a distinct SSRC for each simulcast stream (as opposed= to using the same SSRC but adjusting the resolution/framerate)=2C it may&n= bsp=3Bpause sending one SSRC and =3Bresume sending=0A= another (lower bandwidth one). =3B Where MST is in use=2C the sender m= ay pause an enhancement layer and subsequently resume sending it when it ha= s reason to believe that there is sufficient bandwidth to handle it. = =3B Whether receiver "wishes to receive" a stream=0A= doesn't really enter into the sender's decision if it determines that ther= e isn't sufficient bandwidth available to send it successfully.=0A=

=0A=

[BoB] Fully agree that bandwidth availability has higher precedence than a= ny receiver=92s wishes. This is a typical case where =93local consideration= s=94 override=0A= RTP stream receivers=2C as described in section 5.4. That is also one of t= he very reasons to include the REFUSED indication in the draft. This scenar= io is also viable when using TMMBR/TMMBN=3B a RESUME signaled through TMMBR= >=3B0 can be REFUSED using TMMBN 0 (likely=0A= indicating the RTP stream sender itself owning the bitrate restriction)=2C= as described in section 5.5. I realize that the text is not clear on using= the RTP stream sender=92s own SSRC as the one owning the restriction in TM= MBR/TMMBN signaling whenever =93local=0A= considerations=94 apply=2C which I believe is useful here. I should probab= ly add text about that in a few places. Agree?


[BA] Yes=2C I agree. =3B

=0A=


=0A=  =3B
=0A=  =3B

=0A=

 =3B

=0A=

 =3B
=0A=
=0A=  =3B

=0A=
=0A=
=0A=
= --_849b8d1c-c0e6-4fae-958b-c9debbb9eadb_-- From nobody Thu Sep 18 00:46:49 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 61A8B1A797C for ; Thu, 18 Sep 2014 00:46:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -16.153 X-Spam-Level: X-Spam-Status: No, score=-16.153 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RP_MATCHES_RCVD=-1.652, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sjUpAG8fau2O for ; Thu, 18 Sep 2014 00:46:46 -0700 (PDT) Received: from rcdn-iport-5.cisco.com (rcdn-iport-5.cisco.com [173.37.86.76]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CF9CE1A7113 for ; Thu, 18 Sep 2014 00:46:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3231; q=dns/txt; s=iport; t=1411026406; x=1412236006; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-transfer-encoding:mime-version; bh=Z0/d6HPPtJolEPfDJL8qolw7h716oTkgBpwVgqcsqdo=; b=MsMOa3sUTRd/ujIfw/U3CbaXvhGJGAKv3f1MFq6VTofBoEz8wbMJZUf0 w2oGqLHmu5F/gAcDhtd6dp5fGEVlpV1Eu2krFg8PnZWKftC6Duuzrr+DX MmF2O6BNlHHMrvjhnPjsLFiW7vt/fr38OEqGi8c+KNdU7jdSIzLa1rGmE k=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ag0FAMGMGlStJA2B/2dsb2JhbABhgmojU1cEyRsKhnlUAYEKFgF5hAMBAQEEAQEBNy4GCwwEAgEIEQQBAQsUCQcnCxQJCAIEAQ0FCIg2AQzADwETBI9GMQcGgyiBHQWRToQ3nE+DXmyBSIECAQEB X-IronPort-AV: E=Sophos;i="5.04,545,1406592000"; d="scan'208";a="356182115" Received: from alln-core-9.cisco.com ([173.36.13.129]) by rcdn-iport-5.cisco.com with ESMTP; 18 Sep 2014 07:46:45 +0000 Received: from xhc-rcd-x07.cisco.com (xhc-rcd-x07.cisco.com [173.37.183.81]) by alln-core-9.cisco.com (8.14.5/8.14.5) with ESMTP id s8I7kiHc028560 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 18 Sep 2014 07:46:44 GMT Received: from xmb-aln-x01.cisco.com ([fe80::747b:83e1:9755:d453]) by xhc-rcd-x07.cisco.com ([173.37.183.81]) with mapi id 14.03.0195.001; Thu, 18 Sep 2014 02:46:44 -0500 From: "Ali C. Begen (abegen)" To: "DRAGE, Keith (Keith)" , "avtext@ietf.org" Thread-Topic: Alignment of 4566bis with RTP taxonomy draft Thread-Index: AQHPnKb6HjdKqcd0IkG2qQJyg+i3uZuaG2IggGzUEf4= Date: Thu, 18 Sep 2014 07:46:44 +0000 Message-ID: References: <06F60AED-D155-4030-A603-68F16E013E61@cisco.com>, <949EF20990823C4C85C18D59AA11AD8B2035DB@FR712WXCHMBA11.zeu.alcatel-lucent.com> In-Reply-To: <949EF20990823C4C85C18D59AA11AD8B2035DB@FR712WXCHMBA11.zeu.alcatel-lucent.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.19.222.166] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/9XUSyMNZsFb4QfJSUFwCCm7oXBQ Cc: "draft-ietf-mmusic-rfc4566bis@tools.ietf.org" Subject: Re: [avtext] Alignment of 4566bis with RTP taxonomy draft X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Sep 2014 07:46:47 -0000 OK, time to make 4566bis refer to the taxonomy draft. My proposal is to int= roduce the following text (a bit more tailored) to the taxonomy draft. As i= t is a WG document, please comment. Ow, Bo (the editor) should get it into = the draft in the next revision so 4566bis can refer to it.=0A= =0A= 4.12. Multimedia Conference=0A= =0A= A Multimedia Conference is a Communication Session (Section 2.2.5)=0A= between two or more Participants (Section 2.2.3), along with the=0A= software they are using to communicate.=0A= =0A= -acbegen=0A= =0A= ________________________________________=0A= From: DRAGE, Keith (Keith) [keith.drage@alcatel-lucent.com]=0A= Sent: Friday, July 11, 2014 1:20 PM=0A= To: Ali C. Begen (abegen); avtext@ietf.org=0A= Cc: draft-ietf-mmusic-rfc4566bis@tools.ietf.org=0A= Subject: RE: Alignment of 4566bis with RTP taxonomy draft=0A= =0A= I'd note that the conference definition does not appear to be particularly = distinct from what I remember as the ITU-T definition for call, which was a= n association of two or more users.=0A= =0A= To be distinct, I suspect we need to be more specific on what the software = is - maybe we need to say something about needing mixing support.=0A= =0A= Keith=0A= =0A= > -----Original Message-----=0A= > From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of=0A= > Ali C. Begen (abegen)=0A= > Sent: 11 July 2014 02:25=0A= > To: avtext@ietf.org=0A= > Cc: draft-ietf-mmusic-rfc4566bis@tools.ietf.org=0A= > Subject: [avtext] Alignment of 4566bis with RTP taxonomy draft=0A= >=0A= > Bo asked me to check the 4566bis (mmusic) draft to make sure=0A= > it was aligned with=0A= > https://datatracker.ietf.org/doc/draft-ietf-avtext-rtp-groupin=0A= > g-taxonomy/=0A= >=0A= > Here is the summary. 4566bis is making the following=0A= > definitions (remaining from 4566):=0A= >=0A= > Conference: A multimedia conference is a set of two or more=0A= > communicating users along with the software they are using to=0A= > communicate.=0A= >=0A= > Session: A multimedia session is a set of multimedia senders and=0A= > receivers and the data streams flowing from senders to receivers.=0A= > A multimedia conference is an example of a multimedia session.=0A= >=0A= > Session Description: A well-defined format for conveying sufficient=0A= > information to discover and participate in a multimedia session.=0A= >=0A= > My recommendations:=0A= > 1) "Conference" should be defined in the taxonomy draft and=0A= > 4566bis just refers to it.=0A= >=0A= > 2) "Session" is not defined in the taxonomy draft but we will=0A= > adopt/use "multimedia session" defined in the taxonomy draft.=0A= >=0A= > 3) "Session Description" should stay in 4566bis.=0A= >=0A= > Now, Bo asked me to provide a definition for "conference" and=0A= > the definition above is one proposal. I will leave it to=0A= > AVTEXT to agree on its definition. 4566bis will just refer to=0A= > the avtext document.=0A= >=0A= > Thanks.=0A= > -acbegen=0A= > _______________________________________________=0A= > avtext mailing list=0A= > avtext@ietf.org=0A= > https://www.ietf.org/mailman/listinfo/avtext=0A= >=0A= From nobody Fri Sep 19 08:01:07 2014 Return-Path: X-Original-To: avtext@ietfa.amsl.com Delivered-To: avtext@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 85DE51A0009 for ; Fri, 19 Sep 2014 08:01:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.51 X-Spam-Level: * X-Spam-Status: No, score=1.51 tagged_above=-999 required=5 tests=[BAYES_50=0.8, HTML_MESSAGE=0.001, J_CHICKENPOX_12=0.6, J_CHICKENPOX_15=0.6, J_CHICKENPOX_17=0.6, J_CHICKENPOX_51=0.6, J_CHICKENPOX_61=0.6, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_FILL_THIS_FORM_SHORT=0.01] autolearn=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0wvSS6j-TURV for ; Fri, 19 Sep 2014 08:00:37 -0700 (PDT) Received: from sesbmg23.ericsson.net (sesbmg23.ericsson.net [193.180.251.37]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A0C591A016B for ; Fri, 19 Sep 2014 08:00:34 -0700 (PDT) X-AuditID: c1b4fb25-f791c6d00000617b-97-541c450f3af5 Received: from ESESSHC017.ericsson.se (Unknown_Domain [153.88.253.124]) by sesbmg23.ericsson.net (Symantec Mail Security) with SMTP id AD.B1.24955.F054C145; Fri, 19 Sep 2014 17:00:31 +0200 (CEST) Received: from ESESSMB105.ericsson.se ([169.254.5.215]) by ESESSHC017.ericsson.se ([153.88.183.69]) with mapi id 14.03.0174.001; Fri, 19 Sep 2014 17:00:29 +0200 From: Bo Burman To: Bernard Aboba , "avtext@ietf.org" Thread-Topic: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 Thread-Index: AQHP0jN1uJj+/jLIEEmtXmUHB8gdz5wE3dZggABwtoCAAz9oEA== Date: Fri, 19 Sep 2014 15:00:28 +0000 Message-ID: References: <949EF20990823C4C85C18D59AA11AD8B212C0B@FR712WXCHMBA11.zeu.alcatel-lucent.com>, , <53F1DD5D.6030204@nteczone.com>, , , , <53F441C3.5050201@nteczone.com>, , , , <53FD7F8A.6060608@nteczone.com>, , , , <54051326.5090103@nteczone.com>, , , , , , <5417AB01.2010801@nteczone.com>, , , , In-Reply-To: Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.18] Content-Type: multipart/mixed; boundary="_004_BBE9739C2C302046BD34B42713A1E2A22E2D1751ESESSMB105erics_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrKIsWRmVeSWpSXmKPExsUyM+JvjS6/q0yIwZEZJhYf791gtdi/5DKz A5PH454zbB5LlvxkCmCK4rJJSc3JLEst0rdL4MqY/mc1U8HkbdwV7y6UNjBu+s7VxcjJISFg InHk1mYWCFtM4sK99WxdjFwcQgJHGSWurJgJ5SxhlLi2dyIbSBWbgIbE/B13GUFsEYEQiRVt S1lBbGEBN4l3789Bxd0l7h1bxQZhO0msXH8QLM4ioCqxad9xsDivgK/Eyt4+FogFG9kklky8 B5bgFLCSmHPyH1gDo4CsxP3v98DOYxYQl7j1ZD4TxKkiEg8vnmaDsEUlXj7+xwphK0p8fLUP qJcDqD5T4tvDFIhdghInZz5hmcAoMgvJpFkIVbOQVEGU5Eu8eHKSEcLWkViw+xMbhK0tsWzh a2YY+8yBx0yY4sESV5t+s0OMd5VYfjcEInyRUWL5sSIIW1FiSvdD9gWMPKsYRYtTi5Ny042M 9VKLMpOLi/Pz9PJSSzYxAuP54JbfqjsYL79xPMQowMGoxMOr0CcdIsSaWFZcmXuIUZqDRUmc d+G5ecFCAumJJanZqakFqUXxRaU5qcWHGJk4OKUaGJPUN1R3R3mXSqmzXujKyanpmcCX21AY 9vWj8fEjJtKWqzZNtZcNlmrdMy3EU7V5jbp70pQegQbBvDnW8jx1k7ts8uYXHmef8CdW0SpP +cg/xYlLPc59TTT9bi5d7vL8GNf/SZEX8uOss81jnY/Yn0+5ucxdQ77kft3958Ghjx9FG+uv Ya9RYinOSDTUYi4qTgQARPRdXcgCAAA= Archived-At: http://mailarchive.ietf.org/arch/msg/avtext/5P6yRyJ1yRkFtPZA3LkRPMxprQY Subject: Re: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 X-BeenThere: avtext@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Audio/Video Transport Extensions working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Sep 2014 15:01:05 -0000 --_004_BBE9739C2C302046BD34B42713A1E2A22E2D1751ESESSMB105erics_ Content-Type: multipart/alternative; boundary="_000_BBE9739C2C302046BD34B42713A1E2A22E2D1751ESESSMB105erics_" --_000_BBE9739C2C302046BD34B42713A1E2A22E2D1751ESESSMB105erics_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Bernard, Please find attached a draft -03 version that tries to address your concern= s, describing local pause a bit better and trying to clean up the text on u= se of TMMBR/TMMBN. There are multiple edits, which is why I choose to attac= h the entire text. It should be possible to use the diff tool on the IETF t= ools page to better see what I've done compared to -02. Note that there are= also edits based on comments other than yours in the text, compared to -02= version. Do you think that your concerns are sufficiently covered? Further comments = are of course welcome! Cheers, /Bo From: Bernard Aboba [mailto:bernard_aboba@hotmail.com] Sent: den 17 september 2014 17:16 To: Bo Burman; avtext@ietf.org Subject: RE: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 Comments below. ________________________________ From: bo.burman@ericsson.com To: bernard_aboba@hotmail.com; avtext@iet= f.org Subject: RE: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 Date: Wed, 17 Sep 2014 07:15:44 +0000 Responses inline /Bo From: avtext [mailto:avtext-bounces@ietf.org] On Behalf Of Bernard Aboba Sent: den 17 september 2014 06:53 To: avtext@ietf.org Subject: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02 Section 1 This document describes several scenarios in multimedia communication where a conferencing node or participant chooses to temporarily pause an incoming RTP [RFC3550] stream and later resume it when needed. The receiver does not need to terminate or inactivate the RTP session and start all over again by negotiating the session parameters, for example using SIP [RFC3261] with SDP Offer/Answer [RF= C3264]. Centralized nodes, like RTP Mixers or MCUs, which either uses logic based on voice activity, other measurements, or user input could reduce the resources consumed in both the sender and the network by temporarily pausing the RTP streams that aren't required by the RTP Mixer. [BA] There is another potential use case for a centralized node. Could str= eam pause/resume also be used to enable a centralized node to notify a rece= iver that it has chosen to pause a stream on its own (without being asked)?= For example, there are situations where an multi-stream SFU may wish to d= rop a layer (RTCP RRs or PLI indicates congestion). Today this is handled = via codec-specific messages (e.g. SEI layer drop). However, if it was des= ired to handle this in a codec-independent way, could a centralized node se= nd an unsolicited PAUSED (e.g. TMMBN =3D 0) message? [BoB] Yes, that is the intention. I could add some text in the introduction= about that. This is fully in line with the rest of the document. See for e= xample first part of section 5.3 "Media Sender Pausing"; An RTP stream sender can choose to pause the stream at any time. This can either be as a result of receiving a PAUSE, or be based on some local sender consideration. When it does, it sends a PAUSED indication, containing the available PauseID. If the stream was paused by a TMMBR 0, TMMBN 0 is used as PAUSED indication. What is said on PAUSED in the rest of this paragraph apply also to the use of TMMBN 0, except for PAUSED message parameters. Do you think that the text need further clarification? I see no problem add= ing explicit text regarding unsolicited sending of TMMBN 0. [BA] Yes, some clarification might be helpful in the case where the PAUSED = is unsolicited. For example, is there any reply to an unsolicited TMMBN 0? Section 4.2 It is the responsibility of an RTP stream receiver, who wants to pause or r= esume a stream from the sender(s), to transmit PAUSE and RESUME messages. A= n RTP stream sender who likes to pause itself, can simply do it. Any indica= tion that an RTP stream is paused is the responsibility of the RTP stream s= ender and may in some cases not even be needed by the stream receiver. [BA] Not sure I agree with this for the multi-stream transmission case. If= a sender stops sending a layer with no notification, then the receiver cou= ld be adversely affected. For example, it could be waiting for a spatial e= nhancement layer that never shows up. That is why we have SEI layer drop = messages, right? [BoB] If you refer to the sentence marked in red above, it was intended to = highlight a fact that was there already before this draft, not to specifica= lly allow something that was previously disallowed. Maybe that sentence cou= ld be changed into something like "An RTP stream sender who likes to pause = itself can often simply do it, but sometimes this will adversely affect the= receiver and an explicit indication that the RTP stream is paused may then= help"? [BA] That would be helpful, yes. Section 4.4 An RTP stream sender should not pause an SSRC that some receiver still wish= es to receive. The reason is that in RTP topologies where the stream is sha= red between multiple receivers, a single receiver on that shared network, i= ndependent of it being multicast, a mesh with joint RTP session or a transp= ort Translator based, must not single- handedly cause the stream to be paus= ed without letting all other receivers to voice their opinions on whether o= r not the stream should be paused. A consequence of this is that a newly jo= ining receiver, for example indicated by an RTCP Receiver Report containing= both a new SSRC and a CNAME that does not already occur in the session, fi= rstly needs to learn the existence of paused streams, and secondly should b= e able to resume any paused stream. Any single receiver wanting to resume a= stream should also cause it to be resumed. [BA] In many simulcast and MST implementations, the centralized unit utiliz= es sender-based congestion control, which means that it decides which strea= ms to send based on indications from the receiver such as packet loss, etc.= If there is substantial loss, the sender will adjust the streams it is s= ending. In implementations where the SFU uses a distinct SSRC for each sim= ulcast stream (as opposed to using the same SSRC but adjusting the resoluti= on/framerate), it may pause sending one SSRC and resume sending another (lo= wer bandwidth one). Where MST is in use, the sender may pause an enhanceme= nt layer and subsequently resume sending it when it has reason to believe t= hat there is sufficient bandwidth to handle it. Whether receiver "wishes t= o receive" a stream doesn't really enter into the sender's decision if it d= etermines that there isn't sufficient bandwidth available to send it succes= sfully. [BoB] Fully agree that bandwidth availability has higher precedence than an= y receiver's wishes. This is a typical case where "local considerations" ov= erride RTP stream receivers, as described in section 5.4. That is also one = of the very reasons to include the REFUSED indication in the draft. This sc= enario is also viable when using TMMBR/TMMBN; a RESUME signaled through TMM= BR>0 can be REFUSED using TMMBN 0 (likely indicating the RTP stream sender = itself owning the bitrate restriction), as described in section 5.5. I real= ize that the text is not clear on using the RTP stream sender's own SSRC as= the one owning the restriction in TMMBR/TMMBN signaling whenever "local co= nsiderations" apply, which I believe is useful here. I should probably add = text about that in a few places. Agree? [BA] Yes, I agree. --_000_BBE9739C2C302046BD34B42713A1E2A22E2D1751ESESSMB105erics_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bernard,

 <= /p>

Please find attached a dr= aft -03 version that tries to address your concerns, describing local pause= a bit better and trying to clean up the text on use of TMMBR/TMMBN. There are multiple edits, which is why I choose to attach the= entire text. It should be possible to use the diff tool on the IETF tools = page to better see what I’ve done compared to -02. Note that there ar= e also edits based on comments other than yours in the text, compared to -02 version.

 <= /p>

Do you think that your co= ncerns are sufficiently covered? Further comments are of course welcome!

 <= /p>

Cheers,=

/Bo

 <= /p>

From: Bernard = Aboba [mailto:bernard_aboba@hotmail.com]
Sent: den 17 september 2014 17:16
To: Bo Burman; avtext@ietf.org
Subject: RE: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-0= 2

 

Comments below. 

From: bo.burman@ericsson.com
To: bernard_aboba@hotmail.com<= /a>; avtext@ietf.org
Subject: RE: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02
Date: Wed, 17 Sep 2014 07:15:44 +0000

Responses inline<= /o:p>

/Bo<= /p>

 

From: avtext [= mailto:avtext-bounces@ietf.org] On Behalf Of Bernard Aboba
Sent: den 17 september 2014 06:53
To: avtext@ietf.org
Subject: [avtext] Review of draft-ietf-avtext-rtp-stream-pause-02=

 

Section 1
 
   This document describes several
   scenarios in multimedia communication where a conferencing nod= e or
   participant chooses to temporarily pause an incoming RTP [RFC3550]<= br>    stream and later resume it when needed.  The receiver doe= s not need
   to terminate or inactivate the RTP session and start all over = again
   by negotiating the session parameters, for example using SIP    [RFC3261] wi= th SDP Offer/Answer [RFC3264].
 
  Centralized nodes, like RTP Mixers or MCUs, which either uses logic<= br>    based on voice activity, other measurements, or user input cou= ld
   reduce the resources consumed in both the sender and the netwo= rk by
   temporarily pausing the RTP streams that aren't required by th= e RTP
   Mixer.
 
[BA] There is another potential use case for a centralized node.  Coul= d stream pause/resume also be used to enable a centralized node to notify a= receiver that it has chosen to pause a stream on its own (without being as= ked)?  For example, there are situations where an multi-stream SFU may wish to drop a layer (RTCP RRs or PLI indica= tes congestion).  Today this is handled via codec-specific messages (e= .g. SEI layer drop).   However, if it was desired to handle = this in a codec-independent way, could a centralized node send an unsolicited PAUSED (e.g. TMMBN =3D 0) message?

[BoB] Yes, that is = the intention. I could add some text in the introduction about that. This i= s fully in line with the rest of the document. See for example first part of section 5.3 “Media Sender Pausing”;

   An RTP stream sender can choose= to pause the stream at any time.

   This can either be as a result = of receiving a PAUSE, or be based on

   some local sender consideration= .  When it does, it sends a PAUSED

   indication, containing the avai= lable PauseID.  If the stream was

   paused by a TMMBR 0, TMMBN 0 is= used as PAUSED indication.  What is

   said on PAUSED in the rest of t= his paragraph apply also to the use of

    TMMBN 0, except for PAUSE= D message parameters.

Do you think that t= he text need further clarification? I see no problem adding explicit text r= egarding unsolicited sending of TMMBN 0.

 

[BA] Yes, some = ;clarification might be helpful in the case where the PAUSED is unsolicited.  For example,= is there any reply to an unsolicited TMMBN 0?=

 
Section 4.2
 
It is the responsibility of an RTP stream receiver, who wants to pause or r= esume a stream from the sender(s), to transmit PAUSE and RESUME messages. An RTP stream sender who likes to pause itself, c= an simply do it. Any indication that an RTP stream is paused is the = responsibility of the RTP stream sender and may in some cases not even be n= eeded by the stream receiver.
 
[BA] Not sure I agree with this for the multi-stream transmission case.&nbs= p; If a sender stops sending a layer with no notification, then the re= ceiver could be adversely affected.  For example, it could be waiting = for a spatial enhancement layer that never shows up.   That is why we have SEI layer drop messages, right? <= /o:p>

[BoB] If you refer = to the sentence marked in red above, it was intended to highlight a fact th= at was there already before this draft, not to specifically allow something that was previously disallowed. Maybe that sentence could = be changed into something like “An RTP stream sender who likes to pau= se itself can often simply do it, but sometimes this will adversely affect = the receiver and an explicit indication that the RTP stream is paused may then help”?<= /span>

 

[BA] That would be = helpful, yes. 


 
Section 4.4
 
An RTP stream sender should not pause an SSRC that some receiver still wish= es to receive. The reason is that in RTP topologies where the stream is sha= red between multiple receivers, a single receiver on that shared network, i= ndependent of it being multicast, a mesh with joint RTP session or a transport Translator based, must not si= ngle- handedly cause the stream to be paused without letting all other rece= ivers to voice their opinions on whether or not the stream should be paused= . A consequence of this is that a newly joining receiver, for example indicated by an RTCP Receiver Report= containing both a new SSRC and a CNAME that does not already occur in the = session, firstly needs to learn the existence of paused streams, and second= ly should be able to resume any paused stream. Any single receiver wanting to resume a stream should also = cause it to be resumed.
 
[BA] In many simulcast and MST implementations, the centralized unit utiliz= es sender-based congestion control, which means that it decides which strea= ms to send based on indications from the receiver such as packet loss, etc.=    If there is substantial loss, the sender will adjust the streams it is sending.  In implementations= where the SFU uses a distinct SSRC for each simulcast stream (as opposed t= o using the same SSRC but adjusting the resolution/framerate), it may = pause sending one SSRC and resume sending another (lower bandwidth one).  Where MST is in use, the sender may p= ause an enhancement layer and subsequently resume sending it when it has re= ason to believe that there is sufficient bandwidth to handle it.  Whet= her receiver "wishes to receive" a stream doesn't really enter into the sender's decision if it determines that ther= e isn't sufficient bandwidth available to send it successfully.

[BoB] Fully agree t= hat bandwidth availability has higher precedence than any receiver’s = wishes. This is a typical case where “local considerations” ove= rride RTP stream receivers, as described in section 5.4. That is also one of the= very reasons to include the REFUSED indication in the draft. This scenario= is also viable when using TMMBR/TMMBN; a RESUME signaled through TMMBR>= 0 can be REFUSED using TMMBN 0 (likely indicating the RTP stream sender itself owning the bitrate restriction), a= s described in section 5.5. I realize that the text is not clear on using t= he RTP stream sender’s own SSRC as the one owning the restriction in = TMMBR/TMMBN signaling whenever “local considerations” apply, which I believe is useful here. I should prob= ably add text about that in a few places. Agree?

 

[BA] Yes, I agree.&= nbsp;


 
 

=  

 

 

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