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Cc: sipcore mailing list <sipcore@ietf.org>, sipcore chair <sipcore-chairs@tools.ietf.org>, RFC Editor <rfc-editor@rfc-editor.org>
Subject: [sipcore] Protocol Action: 'An Extension to the Session Initiation Protocol	(SIP) for Request History Information' to Proposed Standard	(draft-ietf-sipcore-rfc4244bis-12.txt)
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The IESG has approved the following document:
- 'An Extension to the Session Initiation Protocol (SIP) for Request
   History Information'
  (draft-ietf-sipcore-rfc4244bis-12.txt) as Proposed Standard

This document is the product of the Session Initiation Protocol Core
Working Group.

The IESG contact persons are Richard Barnes and Gonzalo Camarillo.

A URL of this Internet Draft is:
http://datatracker.ietf.org/doc/draft-ietf-sipcore-rfc4244bis/




Technical Summary

  Like its predecessor, RFC 4244, this document defines a
  standard mechanism for capturing the history
  information associated with a Session Initiation Protocol (SIP)
  request.  This capability enables many enhanced services by providing
  the information as to how and why a call arrives at a specific
  application or user.  This document defines a new optional SIP
  header, History-Info, for capturing the history information in
  requests.

  This revision was made following substantial deployment experience.
  It clarifies many things that have been found confusing, and adds
  additional information that assists interpretation of the captured
  information. That added information helped this draft to satisfy a
  need to deliver the request URI and parameters to a UAS.

Working Group Summary

  The main thing to note about the process for this document is
  that it was very long. It has been in progress for over three years,
  with three WGLCs. The first two WGLCs each identified issues that
  required further discussion and rework of the document. This is
  a reflection of a gradual realization that 4244 had glossed over
  many points. It also indicates that much of the significant
  review of the document was driven by WGLC.

Document Quality

  There is at least one implementation.
   3GPP IMS has a dependency on this document. It will be
   incorporated by reference in an upcoming version of IMS,
   and will thus eventually be implemented widely. There have 
   been a number of significant reviews. The reviewers are
   called out in the Acknowledgements section of the document.
   There is nothing in this document that calls for an
    expert review.

Personnel

  Paul Kyzivat is the document shepherd. Richard Barnes is the responsible area director.

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Subject: [sipcore] Multiple P-Access-Network-Info header in the same SIP request
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Hi,

=20

According to RFC specification this header(PANI) should be a single valued =
header, while in 3GPP specification, this header is defined as multiple val=
ued header.=20

=20

Normally we build our software following SIP RFC specification. Actually ev=
en inside the 3GPP specification the same RFC specification also has been r=
eferenced.
But there are differences between 3GPP spec and the RFC even though the 3GP=
P spec references the same RFC.  So clearly there is an ambiguity here.

=20

Could you bring some clarity on the SIP RFC spec and  3GPP spec?

=20

Thanks and Regards,

Surya Yarramilli | Principal Software Engineer
ORACLE=20

=20

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nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>Hi,<o:p></o:p></=
p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>According =
to RFC specification this header(PANI) should be a single valued header, wh=
ile in 3GPP specification, this header is defined as multiple valued header=
. <o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNo=
rmal>Normally we build our software following SIP RFC specification. Actual=
ly even inside the 3GPP specification the same RFC specification also has b=
een referenced.<br>But there are differences between 3GPP spec and the RFC =
even though the 3GPP spec references the same RFC.&nbsp; So clearly there i=
s an ambiguity here.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></=
p><p class=3DMsoNormal>Could you bring some clarity on the SIP RFC spec and=
 &nbsp;3GPP spec?<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><=
p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Verdana","=
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0pt;font-family:"Verdana","sans-serif"'>Surya Yarramilli | Principal Softwa=
re Engineer<br>ORACLE </span><o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp=
;</o:p></p></div></body></html>
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From keith.drage@alcatel-lucent.com  Mon Nov  4 10:09:02 2013
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From: "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>
To: Surya Yarramilli <surya.yarramilli@oracle.com>, "sipcore@ietf.org" <sipcore@ietf.org>
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Subject: Re: [sipcore] Multiple P-Access-Network-Info header in the same SIP	request
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Are you referring to RFC3455 or to https://datatracker.ietf.org/doc/draft-d=
rage-sipping-rfc3455bis/

Release 12 of 3GPP is referencing the latter document.

regards

Keith

________________________________
From: sipcore-bounces@ietf.org [mailto:sipcore-bounces@ietf.org] On Behalf =
Of Surya Yarramilli
Sent: 04 November 2013 16:48
To: sipcore@ietf.org
Subject: [sipcore] Multiple P-Access-Network-Info header in the same SIP re=
quest

Hi,

According to RFC specification this header(PANI) should be a single valued =
header, while in 3GPP specification, this header is defined as multiple val=
ued header.

Normally we build our software following SIP RFC specification. Actually ev=
en inside the 3GPP specification the same RFC specification also has been r=
eferenced.
But there are differences between 3GPP spec and the RFC even though the 3GP=
P spec references the same RFC.  So clearly there is an ambiguity here.

Could you bring some clarity on the SIP RFC spec and  3GPP spec?

Thanks and Regards,

Surya Yarramilli | Principal Software Engineer
ORACLE


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<div dir=3D"ltr" align=3D"left"><span class=3D"907360518-04112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2">Are you referring to RFC3455 or t=
o
<a href=3D"https://datatracker.ietf.org/doc/draft-drage-sipping-rfc3455bis/=
">https://datatracker.ietf.org/doc/draft-drage-sipping-rfc3455bis/</a></fon=
t></span></div>
<div dir=3D"ltr" align=3D"left"><span class=3D"907360518-04112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2"></font></span>&nbsp;</div>
<div dir=3D"ltr" align=3D"left"><span class=3D"907360518-04112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2">Release 12 of 3GPP is referencing=
 the latter document.</font></span></div>
<div dir=3D"ltr" align=3D"left"><span class=3D"907360518-04112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2"></font></span>&nbsp;</div>
<div dir=3D"ltr" align=3D"left"><span class=3D"907360518-04112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2">regards</font></span></div>
<div dir=3D"ltr" align=3D"left"><span class=3D"907360518-04112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2"></font></span>&nbsp;</div>
<div dir=3D"ltr" align=3D"left"><span class=3D"907360518-04112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2">Keith</font></span></div>
<br>
<blockquote dir=3D"ltr" style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDE=
R-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<div class=3D"OutlookMessageHeader" lang=3D"en-us" dir=3D"ltr" align=3D"lef=
t">
<hr tabindex=3D"-1">
<font face=3D"Tahoma" size=3D"2"><b>From:</b> sipcore-bounces@ietf.org [mai=
lto:sipcore-bounces@ietf.org]
<b>On Behalf Of </b>Surya Yarramilli<br>
<b>Sent:</b> 04 November 2013 16:48<br>
<b>To:</b> sipcore@ietf.org<br>
<b>Subject:</b> [sipcore] Multiple P-Access-Network-Info header in the same=
 SIP request<br>
</font><br>
</div>
<div></div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">According to RFC specification this header(PANI) sho=
uld be a single valued header, while in 3GPP specification, this header is =
defined as multiple valued header.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Normally we build our software following SIP RFC spe=
cification. Actually even inside the 3GPP specification the same RFC specif=
ication also has been referenced.<br>
But there are differences between 3GPP spec and the RFC even though the 3GP=
P spec references the same RFC.&nbsp; So clearly there is an ambiguity here=
.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Could you bring some clarity on the SIP RFC spec and=
 &nbsp;3GPP spec?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Verdan=
a','sans-serif'">Thanks and Regards,</span><br>
<br>
<span style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">Surya =
Yarramilli | Principal Software Engineer<br>
ORACLE </span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</blockquote>
</body>
</html>

--_000_949EF20990823C4C85C18D59AA11AD8B0C7D22FR712WXCHMBA11zeu_--

From brett@broadsoft.com  Mon Nov  4 10:40:56 2013
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From: Brett Tate <brett@broadsoft.com>
To: "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>, Surya Yarramilli <surya.yarramilli@oracle.com>, "sipcore@ietf.org" <sipcore@ietf.org>
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Subject: Re: [sipcore] Multiple P-Access-Network-Info header in the same SIP request
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Hi,

The P-Access-Network-Info ABNF within rfc3455bis is not backwards compatibl=
e to RFC 3455 concerning allowing multiple P-Access-Network-Info headers an=
d/or COMMA separated entries.  Does 3GPP provide a mechanism to avoid poten=
tial interoperability issues?

Thanks,
Brett

----

draft-drage-sipping-rfc3455bis-09:

    P-Access-Network-Info  =3D "P-Access-Network-Info" HCOLON
                                  access-net-spec *(COMMA access-net-spec)
         access-net-spec        =3D (access-type / access-class)
                                  *(SEMI access-info)

RFC 3455:

      P-Access-Network-Info  =3D "P-Access-Network-Info" HCOLON
                               access-net-spec
      access-net-spec        =3D access-type *(SEMI access-info)


From keith.drage@alcatel-lucent.com  Mon Nov  4 10:52:13 2013
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From: "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>
To: Brett Tate <brett@broadsoft.com>, Surya Yarramilli <surya.yarramilli@oracle.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Multiple P-Access-Network-Info header in the same SIP request
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No because 3GPP has always specified that that is allowed, thus overriding =
RFC 3455.

Keith=20

> -----Original Message-----
> From: Brett Tate [mailto:brett@broadsoft.com]=20
> Sent: 04 November 2013 18:42
> To: DRAGE, Keith (Keith); Surya Yarramilli; sipcore@ietf.org
> Subject: RE: [sipcore] Multiple P-Access-Network-Info header=20
> in the same SIP request
>=20
> Hi,
>=20
> The P-Access-Network-Info ABNF within rfc3455bis is not=20
> backwards compatible to RFC 3455 concerning allowing multiple=20
> P-Access-Network-Info headers and/or COMMA separated entries.=20
>  Does 3GPP provide a mechanism to avoid potential=20
> interoperability issues?
>=20
> Thanks,
> Brett
>=20
> ----
>=20
> draft-drage-sipping-rfc3455bis-09:
>=20
>     P-Access-Network-Info  =3D "P-Access-Network-Info" HCOLON
>                                   access-net-spec *(COMMA=20
> access-net-spec)
>          access-net-spec        =3D (access-type / access-class)
>                                   *(SEMI access-info)
>=20
> RFC 3455:
>=20
>       P-Access-Network-Info  =3D "P-Access-Network-Info" HCOLON
>                                access-net-spec
>       access-net-spec        =3D access-type *(SEMI access-info)
>=20
> =

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Subject: Re: [sipcore] Multiple P-Access-Network-Info header in the same SIP request
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--f46d0435c00810535c04ea5f90fe
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That's fine if it works for you all, but that doesn't mean you don't need
to at least document this change in the section that summarizes the changes
made in 3455bis.  You should actually address the backwards compatibility
issue in a sentence highlighting that this is okay because that's what 3GPP
has been doing (which I think implies that there was an error in RFC 3455).


Mary.
As document shepherd


On Mon, Nov 4, 2013 at 12:51 PM, DRAGE, Keith (Keith) <
keith.drage@alcatel-lucent.com> wrote:

> No because 3GPP has always specified that that is allowed, thus overriding
> RFC 3455.
>
> Keith
>
> > -----Original Message-----
> > From: Brett Tate [mailto:brett@broadsoft.com]
> > Sent: 04 November 2013 18:42
> > To: DRAGE, Keith (Keith); Surya Yarramilli; sipcore@ietf.org
> > Subject: RE: [sipcore] Multiple P-Access-Network-Info header
> > in the same SIP request
> >
> > Hi,
> >
> > The P-Access-Network-Info ABNF within rfc3455bis is not
> > backwards compatible to RFC 3455 concerning allowing multiple
> > P-Access-Network-Info headers and/or COMMA separated entries.
> >  Does 3GPP provide a mechanism to avoid potential
> > interoperability issues?
> >
> > Thanks,
> > Brett
> >
> > ----
> >
> > draft-drage-sipping-rfc3455bis-09:
> >
> >     P-Access-Network-Info  = "P-Access-Network-Info" HCOLON
> >                                   access-net-spec *(COMMA
> > access-net-spec)
> >          access-net-spec        = (access-type / access-class)
> >                                   *(SEMI access-info)
> >
> > RFC 3455:
> >
> >       P-Access-Network-Info  = "P-Access-Network-Info" HCOLON
> >                                access-net-spec
> >       access-net-spec        = access-type *(SEMI access-info)
> >
> >
> _______________________________________________
> sipcore mailing list
> sipcore@ietf.org
> https://www.ietf.org/mailman/listinfo/sipcore
>

--f46d0435c00810535c04ea5f90fe
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<div dir=3D"ltr">That&#39;s fine if it works for you all, but that doesn&#3=
9;t mean you don&#39;t need to at least document this change in the section=
 that summarizes the changes made in 3455bis. =A0You should actually addres=
s the backwards compatibility issue in a sentence highlighting that this is=
 okay because that&#39;s what 3GPP has been doing (which I think implies th=
at there was an error in RFC 3455). =A0 =A0<div>
<br></div><div style>Mary.</div><div style>As document shepherd</div></div>=
<div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Mon, Nov 4=
, 2013 at 12:51 PM, DRAGE, Keith (Keith) <span dir=3D"ltr">&lt;<a href=3D"m=
ailto:keith.drage@alcatel-lucent.com" target=3D"_blank">keith.drage@alcatel=
-lucent.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">No because 3GPP has always specified that th=
at is allowed, thus overriding RFC 3455.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
Keith<br>
</font></span><div class=3D"im HOEnZb"><br>
&gt; -----Original Message-----<br>
&gt; From: Brett Tate [mailto:<a href=3D"mailto:brett@broadsoft.com">brett@=
broadsoft.com</a>]<br>
&gt; Sent: 04 November 2013 18:42<br>
&gt; To: DRAGE, Keith (Keith); Surya Yarramilli; <a href=3D"mailto:sipcore@=
ietf.org">sipcore@ietf.org</a><br>
&gt; Subject: RE: [sipcore] Multiple P-Access-Network-Info header<br>
&gt; in the same SIP request<br>
&gt;<br>
</div><div class=3D"HOEnZb"><div class=3D"h5">&gt; Hi,<br>
&gt;<br>
&gt; The P-Access-Network-Info ABNF within rfc3455bis is not<br>
&gt; backwards compatible to RFC 3455 concerning allowing multiple<br>
&gt; P-Access-Network-Info headers and/or COMMA separated entries.<br>
&gt; =A0Does 3GPP provide a mechanism to avoid potential<br>
&gt; interoperability issues?<br>
&gt;<br>
&gt; Thanks,<br>
&gt; Brett<br>
&gt;<br>
&gt; ----<br>
&gt;<br>
&gt; draft-drage-sipping-rfc3455bis-09:<br>
&gt;<br>
&gt; =A0 =A0 P-Access-Network-Info =A0=3D &quot;P-Access-Network-Info&quot;=
 HCOLON<br>
&gt; =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ac=
cess-net-spec *(COMMA<br>
&gt; access-net-spec)<br>
&gt; =A0 =A0 =A0 =A0 =A0access-net-spec =A0 =A0 =A0 =A0=3D (access-type / a=
ccess-class)<br>
&gt; =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 *(=
SEMI access-info)<br>
&gt;<br>
&gt; RFC 3455:<br>
&gt;<br>
&gt; =A0 =A0 =A0 P-Access-Network-Info =A0=3D &quot;P-Access-Network-Info&q=
uot; HCOLON<br>
&gt; =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0access-=
net-spec<br>
&gt; =A0 =A0 =A0 access-net-spec =A0 =A0 =A0 =A0=3D access-type *(SEMI acce=
ss-info)<br>
&gt;<br>
&gt;<br>
_______________________________________________<br>
sipcore mailing list<br>
<a href=3D"mailto:sipcore@ietf.org">sipcore@ietf.org</a><br>
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From: Brett Tate <brett@broadsoft.com>
To: Mary Barnes <mary.ietf.barnes@gmail.com>, "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Multiple P-Access-Network-Info header in the same SIP request
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Hi,

The P-Charging-Function-Addresses header has a similar ABNF backward compat=
ibility issue between the RFC 3455 and rfc3455bis.

Thanks,
Brett

From: Mary Barnes [mailto:mary.ietf.barnes@gmail.com]
Sent: Monday, November 04, 2013 3:14 PM
To: DRAGE, Keith (Keith)
Cc: Brett Tate; Surya Yarramilli; sipcore@ietf.org
Subject: Re: [sipcore] Multiple P-Access-Network-Info header in the same SI=
P request

That's fine if it works for you all, but that doesn't mean you don't need t=
o at least document this change in the section that summarizes the changes =
made in 3455bis.  You should actually address the backwards compatibility i=
ssue in a sentence highlighting that this is okay because that's what 3GPP =
has been doing (which I think implies that there was an error in RFC 3455).

Mary.
As document shepherd

On Mon, Nov 4, 2013 at 12:51 PM, DRAGE, Keith (Keith) <keith.drage@alcatel-=
lucent.com<mailto:keith.drage@alcatel-lucent.com>> wrote:
No because 3GPP has always specified that that is allowed, thus overriding =
RFC 3455.

Keith

> -----Original Message-----
> From: Brett Tate [mailto:brett@broadsoft.com<mailto:brett@broadsoft.com>]
> Sent: 04 November 2013 18:42
> To: DRAGE, Keith (Keith); Surya Yarramilli; sipcore@ietf.org<mailto:sipco=
re@ietf.org>
> Subject: RE: [sipcore] Multiple P-Access-Network-Info header
> in the same SIP request
>
> Hi,
>
> The P-Access-Network-Info ABNF within rfc3455bis is not
> backwards compatible to RFC 3455 concerning allowing multiple
> P-Access-Network-Info headers and/or COMMA separated entries.
>  Does 3GPP provide a mechanism to avoid potential
> interoperability issues?
>
> Thanks,
> Brett
>
> ----
>
> draft-drage-sipping-rfc3455bis-09:
>
>     P-Access-Network-Info  =3D "P-Access-Network-Info" HCOLON
>                                   access-net-spec *(COMMA
> access-net-spec)
>          access-net-spec        =3D (access-type / access-class)
>                                   *(SEMI access-info)
>
> RFC 3455:
>
>       P-Access-Network-Info  =3D "P-Access-Network-Info" HCOLON
>                                access-net-spec
>       access-net-spec        =3D access-type *(SEMI access-info)
>
>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">The P-Charging-Function-A=
ddresses header has a similar ABNF backward compatibility issue between the=
 RFC 3455 and rfc3455bis.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Thanks,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Brett<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Mary Bar=
nes [mailto:mary.ietf.barnes@gmail.com]
<br>
<b>Sent:</b> Monday, November 04, 2013 3:14 PM<br>
<b>To:</b> DRAGE, Keith (Keith)<br>
<b>Cc:</b> Brett Tate; Surya Yarramilli; sipcore@ietf.org<br>
<b>Subject:</b> Re: [sipcore] Multiple P-Access-Network-Info header in the =
same SIP request<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">That's fine if it works for you all, but that doesn'=
t mean you don't need to at least document this change in the section that =
summarizes the changes made in 3455bis. &nbsp;You should actually address t=
he backwards compatibility issue in a sentence
 highlighting that this is okay because that's what 3GPP has been doing (wh=
ich I think implies that there was an error in RFC 3455). &nbsp; &nbsp;<o:p=
></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Mary.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">As document shepherd<o:p></o:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">On Mon, Nov 4, 2013 at 12:51 PM, DRAGE, Keith (Keith=
) &lt;<a href=3D"mailto:keith.drage@alcatel-lucent.com" target=3D"_blank">k=
eith.drage@alcatel-lucent.com</a>&gt; wrote:<o:p></o:p></p>
<p class=3D"MsoNormal">No because 3GPP has always specified that that is al=
lowed, thus overriding RFC 3455.<br>
<span style=3D"color:#888888"><br>
<span class=3D"hoenzb">Keith</span></span><o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><br>
&gt; -----Original Message-----<br>
&gt; From: Brett Tate [mailto:<a href=3D"mailto:brett@broadsoft.com">brett@=
broadsoft.com</a>]<br>
&gt; Sent: 04 November 2013 18:42<br>
&gt; To: DRAGE, Keith (Keith); Surya Yarramilli; <a href=3D"mailto:sipcore@=
ietf.org">sipcore@ietf.org</a><br>
&gt; Subject: RE: [sipcore] Multiple P-Access-Network-Info header<br>
&gt; in the same SIP request<br>
&gt;<o:p></o:p></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">&gt; Hi,<br>
&gt;<br>
&gt; The P-Access-Network-Info ABNF within rfc3455bis is not<br>
&gt; backwards compatible to RFC 3455 concerning allowing multiple<br>
&gt; P-Access-Network-Info headers and/or COMMA separated entries.<br>
&gt; &nbsp;Does 3GPP provide a mechanism to avoid potential<br>
&gt; interoperability issues?<br>
&gt;<br>
&gt; Thanks,<br>
&gt; Brett<br>
&gt;<br>
&gt; ----<br>
&gt;<br>
&gt; draft-drage-sipping-rfc3455bis-09:<br>
&gt;<br>
&gt; &nbsp; &nbsp; P-Access-Network-Info &nbsp;=3D &quot;P-Access-Network-I=
nfo&quot; HCOLON<br>
&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; access-net-spec *(COMMA<br=
>
&gt; access-net-spec)<br>
&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;access-net-spec &nbsp; &nbsp; &nbsp;=
 &nbsp;=3D (access-type / access-class)<br>
&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; *(SEMI access-info)<br>
&gt;<br>
&gt; RFC 3455:<br>
&gt;<br>
&gt; &nbsp; &nbsp; &nbsp; P-Access-Network-Info &nbsp;=3D &quot;P-Access-Ne=
twork-Info&quot; HCOLON<br>
&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;access-net-spec<br>
&gt; &nbsp; &nbsp; &nbsp; access-net-spec &nbsp; &nbsp; &nbsp; &nbsp;=3D ac=
cess-type *(SEMI access-info)<br>
&gt;<br>
&gt;<br>
_______________________________________________<br>
sipcore mailing list<br>
<a href=3D"mailto:sipcore@ietf.org">sipcore@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sipcore" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/sipcore</a><o:p></o:p></p>
</div>
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</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
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Subject: Re: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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On 10/29/13 11:54, Christer Holmberg wrote:
>
>
> In my view it is ok to send a REFER within an INVITE dialog, if the 
> sender *knows* that the receiver will not create a subscription.
>
> HOW the sender knows that (whether usage of Require:norefersub would 
> guarantee it, or whether the knowledge is based on some other 
> information) is outside the scope, I think.
>

The problem is that there's not really a way for the sender to know that 
this is the case. "Require: norefersub" doesn't even get you there, 
since all you're doing is ensuring that the other end supports that 
extensions, not guaranteeing that it will apply it.

In other words, there is know way to absolutely know that the receiver 
will not create a subscription.

> Having said that, I do agree that the text in RFC 5057 seems 
> misleading, as it seems to generally indicate that a subscription will 
> never be created when a REFER utilizes norefersub.
>

I agree that the cited language from RFC5057 can be a bit confusing 
because of its imprecision. I read it to say that any REFER that uses 
the "norefersub" extension -- /which includes//having a "Refer-Sub: 
false" in the response/ -- doesn't create a new usage.

But you don't know what the response will look like /a priori/, so an 
RFC6665 implementation must plan for either outcome. This means that the 
use of REFER with RFC6665 absolutely requires the use of RFC4538 instead 
of dialog re-use whenever the remote target is a GRUU.

/a


> Regards,
>
> Christer
>
> *Lähettäjä:*sipcore-bounces@ietf.org [mailto:sipcore-bounces@ietf.org] 
> *Puolesta *Andrew Allen
> *Lähetetty:* 29. lokakuuta 2013 19:31
> *Vastaanottaja:* sipcore@ietf.org
> *Aihe:* [sipcore] Questions regarding use of REFER by RFC 6665 
> compliant UAs
>
> Recently there has been some offline discussion regarding the impact 
> of RFC 6665 on the use of REFER. Particularly on whether an RFC 6665 
> compliant UA can send a REFER using a dialog created by another SIP 
> method other than for interoperability with UAs that don’t support 
> GRUU and RFC 6665.
>
> RFC 6665 deprecates dialog reuse for subscriptions. REFER can create 
> also create an implicit subscription.
>
> RFC 6665 states:
>
>         ….the dialog reuse technique described in RFC 3265 is now 
> deprecated.
>
> This dialog-sharing technique has also historically been used as a
>
> means for targeting an event package at a dialog.  This usage can be
>
> seen, for example, in certain applications of the REFER method
>
> [RFC3515].  With the removal of dialog reuse, an alternate (and more
>
> explicit) means of targeting dialogs needs to be used for this type
>
> of correlation.  The appropriate means of such targeting is left up
>
> to the actual event packages.  Candidates include the "Target-Dialog"
>
> header field [RFC4538], the "Join" header field [RFC3911], and the
>
> "Replaces" header field [RFC3891], depending on the semantics
>
>    desired.
>
> And
>
> Further note that the prohibition on reusing dialogs does not
>
> exempt implicit subscriptions created by the REFER method. This
>
> means that implementations complying with this specification are
>
> required to use the "Target-Dialog" mechanism described in
>
> [RFC4538] when the remote target is a GRUU.
>
> However RFC 4488 provides a means to request a REFER recipient not to 
> create an implicit subscription through the use of Refer-Sub: false. 
> However the text of RFC 4488 does not require that the REFER recipient 
> not create an implicit subscription since RFC 4488 states:
>
> If the REFER-Recipient supports the extension _and is willing to 
> process the REFER transaction without establishing an implicit 
> subscription_, it MUST insert the "Refer-Sub" header field set to 
> "false" in the 2xx response to the REFER-Issuer.
>
> The key words here are “and is WILLING to process the REFER 
> transaction without establishing an implicit subscription” so there is 
> always the possibility that a subscription will be created even if 
> norefersub is supported and Refer-Sub header field is set to FALSE.
>
> However RFC 5057 seems to be in conflict with RFC 4488 in this regard 
> stating:
>
>    Dialogs with multiple usages arise when a usage-creating action
>
>    occurs inside an existing dialog.  Such actions include accepting a
>
>    REFER or SUBSCRIBE issued inside a dialog established with an INVITE
>
>    request.  Multiple REFERs within a dialog create multiple
>
>    subscriptions, each of which is a new dialog usage sharing common
>
>    dialog state. _(Note that any REFER issued utilizing the_
>
> _   subscription-suppression mechanism specified in [2] creates no new_
>
> _   usage.)_  Similarly, an endpoint in a dialog established with an
>
>    INVITE might subscribe to its peer's Key Press Markup Language (KPML)
>
>    [3] and later issue a REFER, resulting in three dialog usages sharing
>
>    common dialog state.
>
> So the first question is if an RFC 6665 compliant UA indicated either 
> Require: norefersub or knows that the REFER recipient supports 
> norefersub and also indicates Refer-Sub: False in the REFER request 
>  can that REFER request be sent on a dialog created by another Method 
> (in the safe knowledge that no subscription will be created)?
>
> If the answer to the first question is no – an implicit subscription 
> could still be created.
>
> Can some other knowledge that the REFER recipient will not create an 
> implicit subscription - such as the definition in another 
> specification outside of IETF of a feature that mandates that no 
> subscription be created by the REFER recipient and the indication of 
> the support of such a feature by the REFER recipient in a global tree 
> media feature tag has been received by the REFER sender. Does this 
> allow an RFC 6665 UA to send the REFER on a dialog created by another 
> Method?
>
> I have discussed the issue with Adam Roach offline and his view and 
> mine is that RFC 6665 UAs do not send REFER requests sent on a dialog 
> created by another Method except for interoperability with UAs that 
> don’t support GRUU and RFC 6665.
>
> What is the view of the rest of the community?
>
> Andrew
>
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> delete this information from your system. Use, dissemination, 
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    <div class="moz-cite-prefix">On 10/29/13 11:54, Christer Holmberg
      wrote:<br>
    </div>
    <blockquote
cite="mid:7594FB04B1934943A5C02806D1A2204B1C4FAF01@ESESSMB209.ericsson.se"
      type="cite">
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      <div class="WordSection1">
        <p class="MsoNormal"><br>
        </p>
        <p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span><span
            style="color:#1F497D" lang="EN-US">In my view it is ok to
            send a REFER within an INVITE dialog, if the sender
            <b>knows</b> that the receiver will not create a
            subscription.<o:p></o:p></span>
        </p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">HOW
            the sender knows that (whether usage of Require:norefersub
            would guarantee it, or whether the knowledge is based on
            some other information) is outside the scope, I think.</span></p>
      </div>
    </blockquote>
    <br>
    The problem is that there's not really a way for the sender to know
    that this is the case. "Require: norefersub" doesn't even get you
    there, since all you're doing is ensuring that the other end
    supports that extensions, not guaranteeing that it will apply it.<br>
    <br>
    In other words, there is know way to absolutely know that the
    receiver will not create a subscription.<br>
    <br>
    <blockquote
cite="mid:7594FB04B1934943A5C02806D1A2204B1C4FAF01@ESESSMB209.ericsson.se"
      type="cite">
      <div class="WordSection1">
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span><span
            style="color:#1F497D" lang="EN-US">Having said that, I do
            agree that the text in RFC 5057 seems misleading, as it
            seems to generally indicate that a subscription will never
            be created when a REFER utilizes norefersub.</span></p>
      </div>
    </blockquote>
    <br>
    I agree that the cited language from RFC5057 can be a bit confusing
    because of its imprecision. I read it to say that any REFER that
    uses the "norefersub" extension -- <i>which includes</i><i> having
      a "Refer-Sub: false" in the response</i> -- doesn't create a new
    usage.<br>
    <br>
    But you don't know what the response will look like <i>a priori</i>,
    so an RFC6665 implementation must plan for either outcome. This
    means that the use of REFER with RFC6665 absolutely requires the use
    of RFC4538 instead of dialog re-use whenever the remote target is a
    GRUU.<br>
    <br>
    /a<br>
    <br>
    <br>
    <blockquote
cite="mid:7594FB04B1934943A5C02806D1A2204B1C4FAF01@ESESSMB209.ericsson.se"
      type="cite">
      <div class="WordSection1">
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Regards,<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Christer<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #B5C4DF
            1.0pt;padding:3.0pt 0cm 0cm 0cm">
            <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">Lähettäjä:</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">
                <a class="moz-txt-link-abbreviated" href="mailto:sipcore-bounces@ietf.org">sipcore-bounces@ietf.org</a>
                [<a class="moz-txt-link-freetext" href="mailto:sipcore-bounces@ietf.org">mailto:sipcore-bounces@ietf.org</a>]
                <b>Puolesta </b>Andrew Allen<br>
                <b>Lähetetty:</b> 29. lokakuuta 2013 19:31<br>
                <b>Vastaanottaja:</b> <a class="moz-txt-link-abbreviated" href="mailto:sipcore@ietf.org">sipcore@ietf.org</a><br>
                <b>Aihe:</b> [sipcore] Questions regarding use of REFER
                by RFC 6665 compliant UAs<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Recently there has been
            some offline discussion regarding the impact of RFC 6665 on
            the use of REFER. Particularly on whether an RFC 6665
            compliant UA can send a REFER using a dialog created by
            another SIP method other than for interoperability with UAs
            that don’t support GRUU and RFC 6665.<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">RFC 6665 deprecates
            dialog reuse for subscriptions. REFER can create also create
            an implicit subscription.<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">RFC 6665 states:<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            lang="EN-US">        ….</span><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">
            the dialog reuse technique described in RFC 3265 is now
            deprecated.<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            This dialog-sharing technique has also historically been
            used as a<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            means for targeting an event package at a dialog.  This
            usage can be<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            seen, for example, in certain applications of the REFER
            method<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            [RFC3515].  With the removal of dialog reuse, an alternate
            (and more<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            explicit) means of targeting dialogs needs to be used for
            this type<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            of correlation.  The appropriate means of such targeting is
            left up<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            to the actual event packages.  Candidates include the
            "Target-Dialog"<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            header field [RFC4538], the "Join" header field [RFC3911],
            and the<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            "Replaces" header field [RFC3891], depending on the
            semantics<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-family:&quot;Courier
            New&quot;" lang="EN-US">   desired.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-family:&quot;Courier
            New&quot;" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-family:&quot;Courier
            New&quot;" lang="EN-US">And<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-family:&quot;Courier
            New&quot;" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">     
            Further note that the prohibition on reusing dialogs does
            not<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">     
            exempt implicit subscriptions created by the REFER method. 
            This<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">     
            means that implementations complying with this specification
            are<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">     
            required to use the "Target-Dialog" mechanism described in<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">     
            [RFC4538] when the remote target is a GRUU.<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">However RFC 4488
            provides a means to request a REFER recipient not to create
            an implicit subscription through the use of Refer-Sub:
            false. However the text of RFC 4488 does not require that
            the REFER recipient not create an implicit subscription
            since RFC 4488 states:<o:p></o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="text-autospace:none"><span
            style="font-family:&quot;Courier New&quot;" lang="EN-US">  
            If the REFER-Recipient supports the extension
            <u>and is willing to process the REFER transaction without
              establishing an implicit subscription</u>, it MUST insert
            the "Refer-Sub" header field set to "false" in the 2xx
            response to the REFER-Issuer. 
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">The
            key words here are “and is WILLING to process the REFER
            transaction without establishing an implicit subscription”
            so there is always the possibility that a subscription will
            be created even if norefersub is supported and Refer-Sub
            header field is set to FALSE. <o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">However RFC 5057 seems
            to be in conflict with RFC 4488 in this regard stating:<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">   Dialogs with multiple usages arise when a
            usage-creating action<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">   occurs inside an existing dialog.  Such
            actions include accepting a<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">   REFER or SUBSCRIBE issued inside a dialog
            established with an INVITE<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">   request.  Multiple REFERs within a dialog
            create multiple<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">   subscriptions, each of which is a new dialog
            usage sharing common<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">   dialog state. 
            <u>(Note that any REFER issued utilizing the<o:p></o:p></u></span></p>
        <p class="MsoNormal"><u><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
              lang="EN-US">   subscription-suppression mechanism
              specified in [2] creates no new<o:p></o:p></span></u></p>
        <p class="MsoNormal"><u><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
              lang="EN-US">   usage.)</span></u><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">  Similarly, an endpoint in a dialog
            established with an<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">   INVITE might subscribe to its peer's Key
            Press Markup Language (KPML)<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">   [3] and later issue a REFER, resulting in
            three dialog usages sharing<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US">   common dialog state.
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#C0504D"
            lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">So the first question is
            if an RFC 6665 compliant UA indicated either Require:
            norefersub or knows that the REFER recipient supports
            norefersub and also indicates Refer-Sub: False in the REFER
            request  can that REFER request be sent on a dialog created
            by another Method (in the safe knowledge that no
            subscription will be created)?<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">If the answer to the
            first question is no – an implicit subscription could still
            be created.<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Can some other knowledge
            that the REFER recipient will not create an implicit
            subscription - such as the definition in another
            specification outside of IETF of a feature that mandates
            that no subscription be created by the REFER recipient and
            the indication of the support of such a feature by the REFER
            recipient in a global tree media feature tag has been
            received by the REFER sender. Does this allow an RFC 6665 UA
            to send the REFER on a dialog created by another Method?<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">I have discussed the
            issue with Adam Roach offline and his view and mine is that
            RFC 6665 UAs do not send REFER requests sent on a dialog
            created by another Method except for interoperability with
            UAs that don’t support GRUU and RFC 6665.<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">What is the view of the
            rest of the community?<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Andrew<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;" lang="EN-US">---------------------------------------------------------------------<br>
            This transmission (including any attachments) may contain
            confidential information, privileged material (including
            material protected by the solicitor-client or other
            applicable privileges), or constitute non-public
            information. Any use of this information by anyone other
            than the intended recipient is prohibited. If you have
            received this transmission in error, please immediately
            reply to the sender and delete this information from your
            system. Use, dissemination, distribution, or reproduction of
            this transmission by unintended recipients is not authorized
            and may be unlawful.<o:p></o:p></span></p>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
sipcore mailing list
<a class="moz-txt-link-abbreviated" href="mailto:sipcore@ietf.org">sipcore@ietf.org</a>
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</pre>
    </blockquote>
    <br>
  </body>
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From: Ivo Sedlacek <ivo.sedlacek@ericsson.com>
To: Andrew Allen <aallen@blackberry.com>, "adam@nostrum.com" <adam@nostrum.com>, Christer Holmberg <christer.holmberg@ericsson.com>,  "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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Date: Tue, 5 Nov 2013 11:03:45 +0000
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Subject: Re: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Andrew Allen <aallen@blackberry.com>, 'Adam Roach' <adam@nostrum.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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Subject: Re: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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--_000_7594FB04B1934943A5C02806D1A2204B1C50EA96ESESSMB209erics_--

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From: "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>
To: Surya Yarramilli <surya.yarramilli@oracle.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Multiple P-Access-Network-Info header in the same SIP request
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Date: Tue, 5 Nov 2013 18:32:27 +0000
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RFC 3455 is probably not implemented. RFC 3455 as enhanced by 3GPP TS 24.22=
9 is.

the document rfc3455bis is the document that is meant to bring these things=
 back into IETF and corrects these issues, unless you know otherwise. This =
document will be referenced by 3GPP release 12.

Keith

________________________________
From: Surya Yarramilli [mailto:surya.yarramilli@oracle.com]
Sent: 05 November 2013 18:25
To: DRAGE, Keith (Keith); sipcore@ietf.org
Subject: RE: [sipcore] Multiple P-Access-Network-Info header in the same SI=
P request

Hi Keith,

I'm referring to RFC 3455, RFC3261 and 3GPP TS24.229(R7, v7.31.0,latest), P=
-ANI header is extended as below and it follows  the grammar stated RFC3261=
, and thus P-ANI is supporting multiple rows in R7 v7.31.0.

But as per RFC 3455 and RFC3261 only 1 P-ANI header is allowed. Does it req=
uire any correction in SIP RFCs?

BR,
Surya

From: DRAGE, Keith (Keith) [mailto:keith.drage@alcatel-lucent.com]
Sent: Monday, November 04, 2013 11:39 PM
To: Surya Yarramilli; sipcore@ietf.org
Subject: RE: [sipcore] Multiple P-Access-Network-Info header in the same SI=
P request

Are you referring to RFC3455 or to https://datatracker.ietf.org/doc/draft-d=
rage-sipping-rfc3455bis/

Release 12 of 3GPP is referencing the latter document.

regards

Keith

________________________________
From: sipcore-bounces@ietf.org<mailto:sipcore-bounces@ietf.org> [mailto:sip=
core-bounces@ietf.org] On Behalf Of Surya Yarramilli
Sent: 04 November 2013 16:48
To: sipcore@ietf.org<mailto:sipcore@ietf.org>
Subject: [sipcore] Multiple P-Access-Network-Info header in the same SIP re=
quest
Hi,

According to RFC specification this header(PANI) should be a single valued =
header, while in 3GPP specification, this header is defined as multiple val=
ued header.

Normally we build our software following SIP RFC specification. Actually ev=
en inside the 3GPP specification the same RFC specification also has been r=
eferenced.
But there are differences between 3GPP spec and the RFC even though the 3GP=
P spec references the same RFC.  So clearly there is an ambiguity here.

Could you bring some clarity on the SIP RFC spec and  3GPP spec?

Thanks and Regards,

Surya Yarramilli | Principal Software Engineer
ORACLE


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<div dir=3D"ltr" align=3D"left"><span class=3D"550543018-05112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2">RFC 3455 is probably not implemen=
ted. RFC 3455 as enhanced by 3GPP TS 24.229 is.</font></span></div>
<div dir=3D"ltr" align=3D"left"><span class=3D"550543018-05112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2"></font></span>&nbsp;</div>
<div dir=3D"ltr" align=3D"left"><span class=3D"550543018-05112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2">the document rfc3455bis is the do=
cument that is meant to bring these things back into IETF and corrects thes=
e issues, unless you know otherwise. This document
 will be referenced by 3GPP release 12.</font></span></div>
<div dir=3D"ltr" align=3D"left"><span class=3D"550543018-05112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2"></font></span>&nbsp;</div>
<div dir=3D"ltr" align=3D"left"><span class=3D"550543018-05112013"><font fa=
ce=3D"Arial" color=3D"#0000ff" size=3D"2">Keith</font></span></div>
<br>
<blockquote dir=3D"ltr" style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDE=
R-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<div class=3D"OutlookMessageHeader" lang=3D"en-us" dir=3D"ltr" align=3D"lef=
t">
<hr tabindex=3D"-1">
<font face=3D"Tahoma" size=3D"2"><b>From:</b> Surya Yarramilli [mailto:sury=
a.yarramilli@oracle.com]
<br>
<b>Sent:</b> 05 November 2013 18:25<br>
<b>To:</b> DRAGE, Keith (Keith); sipcore@ietf.org<br>
<b>Subject:</b> RE: [sipcore] Multiple P-Access-Network-Info header in the =
same SIP request<br>
</font><br>
</div>
<div></div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"COLOR: #1f497d">Hi Keith,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"COLOR: #1f497d"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"COLOR: #1f497d">I&#8217;m referring t=
o RFC 3455, RFC3261 and
</span>3GPP TS24.229(R7, v7.31.0,latest), P-ANI header is extended as below=
 and it follows &nbsp;the grammar stated RFC3261, and thus P-ANI is support=
ing multiple rows in R7 v7.31.0.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">But as per <span style=3D"COLOR: #1f497d">RFC 3455 a=
nd RFC3261 only 1 P-ANI header is allowed. Does it require any correction i=
n SIP RFCs?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"COLOR: #1f497d"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"COLOR: #1f497d">BR,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"COLOR: #1f497d">Surya<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"COLOR: #1f497d"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b=
5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: mediu=
m none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<p class=3D"MsoNormal"><b><span style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Tah=
oma','sans-serif'">From:</span></b><span style=3D"FONT-SIZE: 10pt; FONT-FAM=
ILY: 'Tahoma','sans-serif'"> DRAGE, Keith (Keith) [mailto:keith.drage@alcat=
el-lucent.com]
<br>
<b>Sent:</b> Monday, November 04, 2013 11:39 PM<br>
<b>To:</b> Surya Yarramilli; sipcore@ietf.org<br>
<b>Subject:</b> RE: [sipcore] Multiple P-Access-Network-Info header in the =
same SIP request<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 10pt; COLOR: blue; FONT-FA=
MILY: 'Arial','sans-serif'">Are you referring to RFC3455 or to
<a href=3D"https://datatracker.ietf.org/doc/draft-drage-sipping-rfc3455bis/=
">https://datatracker.ietf.org/doc/draft-drage-sipping-rfc3455bis/</a></spa=
n><span style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times =
New Roman','serif'">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 10pt; COLOR: blue; FONT-FA=
MILY: 'Arial','sans-serif'">Release 12 of 3GPP is referencing the latter do=
cument.</span><span style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman=
','serif'"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times =
New Roman','serif'">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 10pt; COLOR: blue; FONT-FA=
MILY: 'Arial','sans-serif'">regards</span><span style=3D"FONT-SIZE: 12pt; F=
ONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times =
New Roman','serif'">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 10pt; COLOR: blue; FONT-FA=
MILY: 'Arial','sans-serif'">Keith</span><span style=3D"FONT-SIZE: 12pt; FON=
T-FAMILY: 'Times New Roman','serif'"><o:p></o:p></span></p>
<blockquote style=3D"BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-=
TOP: medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0in; MARGIN: 5pt 0in 5=
pt 3.75pt; BORDER-LEFT: blue 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: =
medium none">
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times =
New Roman','serif'"><o:p>&nbsp;</o:p></span></p>
<div class=3D"MsoNormal" style=3D"TEXT-ALIGN: center" align=3D"center"><spa=
n style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'">
<hr align=3D"center" width=3D"100%" size=3D"2">
</span></div>
<p class=3D"MsoNormal" style=3D"MARGIN-BOTTOM: 12pt"><b><span style=3D"FONT=
-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</span></b><span styl=
e=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
<a href=3D"mailto:sipcore-bounces@ietf.org">sipcore-bounces@ietf.org</a> [<=
a href=3D"mailto:sipcore-bounces@ietf.org">mailto:sipcore-bounces@ietf.org<=
/a>]
<b>On Behalf Of </b>Surya Yarramilli<br>
<b>Sent:</b> 04 November 2013 16:48<br>
<b>To:</b> <a href=3D"mailto:sipcore@ietf.org">sipcore@ietf.org</a><br>
<b>Subject:</b> [sipcore] Multiple P-Access-Network-Info header in the same=
 SIP request</span><span style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times New =
Roman','serif'"><o:p></o:p></span></p>
<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">According to RFC specification this header(PANI) sho=
uld be a single valued header, while in 3GPP specification, this header is =
defined as multiple valued header.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Normally we build our software following SIP RFC spe=
cification. Actually even inside the 3GPP specification the same RFC specif=
ication also has been referenced.<br>
But there are differences between 3GPP spec and the RFC even though the 3GP=
P spec references the same RFC.&nbsp; So clearly there is an ambiguity here=
.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Could you bring some clarity on the SIP RFC spec and=
 &nbsp;3GPP spec?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Verdan=
a','sans-serif'">Thanks and Regards,</span><br>
<br>
<span style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">Surya =
Yarramilli | Principal Software Engineer<br>
ORACLE </span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</blockquote>
</div>
</blockquote>
</body>
</html>

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Andrew Allen <aallen@blackberry.com>, 'Adam Roach' <adam@nostrum.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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Thread-Topic: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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From surya.yarramilli@oracle.com  Tue Nov  5 10:25:41 2013
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From: Surya Yarramilli <surya.yarramilli@oracle.com>
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Subject: Re: [sipcore] Multiple P-Access-Network-Info header in the same SIP request
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Hi Keith,

=20

I'm referring to RFC 3455, RFC3261 and 3GPP TS24.229(R7, v7.31.0,latest), P=
-ANI header is extended as below and it follows  the grammar stated RFC3261=
, and thus P-ANI is supporting multiple rows in R7 v7.31.0.=20

=20

But as per RFC 3455 and RFC3261 only 1 P-ANI header is allowed. Does it req=
uire any correction in SIP RFCs?

=20

BR,

Surya

=20

From: DRAGE, Keith (Keith) [mailto:keith.drage@alcatel-lucent.com]=20
Sent: Monday, November 04, 2013 11:39 PM
To: Surya Yarramilli; sipcore@ietf.org
Subject: RE: [sipcore] Multiple P-Access-Network-Info header in the same SI=
P request

=20

Are you referring to RFC3455 or to https://datatracker.ietf.org/doc/draft-d=
rage-sipping-rfc3455bis/

=20

Release 12 of 3GPP is referencing the latter document.

=20

regards

=20

Keith

=20


  _____ =20


From: HYPERLINK "mailto:sipcore-bounces@ietf.org"sipcore-bounces@ietf.org [=
mailto:sipcore-bounces@ietf.org] On Behalf Of Surya Yarramilli
Sent: 04 November 2013 16:48
To: HYPERLINK "mailto:sipcore@ietf.org"sipcore@ietf.org
Subject: [sipcore] Multiple P-Access-Network-Info header in the same SIP re=
quest

Hi,

=20

According to RFC specification this header(PANI) should be a single valued =
header, while in 3GPP specification, this header is defined as multiple val=
ued header.=20

=20

Normally we build our software following SIP RFC specification. Actually ev=
en inside the 3GPP specification the same RFC specification also has been r=
eferenced.
But there are differences between 3GPP spec and the RFC even though the 3GP=
P spec references the same RFC.  So clearly there is an ambiguity here.

=20

Could you bring some clarity on the SIP RFC spec and  3GPP spec?

=20

Thanks and Regards,

Surya Yarramilli | Principal Software Engineer
ORACLE=20

=20

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nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'c=
olor:#1F497D'>Hi Keith,<o:p></o:p></span></p><p class=3DMsoNormal><span sty=
le=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span=
 style=3D'color:#1F497D'>I&#8217;m referring to RFC 3455, RFC3261 and  </sp=
an>3GPP TS24.229(R7, v7.31.0,latest), P-ANI header is extended as below and=
 it follows &nbsp;the grammar stated RFC3261, and thus P-ANI is supporting =
multiple rows in R7 v7.31.0. <o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp=
;</o:p></p><p class=3DMsoNormal>But as per <span style=3D'color:#1F497D'>RF=
C 3455 and RFC3261 only 1 P-ANI header is allowed. Does it require any corr=
ection in SIP RFCs?<o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span s=
tyle=3D'color:#1F497D'>BR,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Surya<o:p></o:p></span></p><p class=3DMsoNormal><sp=
an style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div style=3D'b=
order:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p cla=
ss=3DMsoNormal><b><span style=3D'font-size:10.0pt;font-family:"Tahoma","san=
s-serif"'>From:</span></b><span style=3D'font-size:10.0pt;font-family:"Taho=
ma","sans-serif"'> DRAGE, Keith (Keith) [mailto:keith.drage@alcatel-lucent.=
com] <br><b>Sent:</b> Monday, November 04, 2013 11:39 PM<br><b>To:</b> Sury=
a Yarramilli; sipcore@ietf.org<br><b>Subject:</b> RE: [sipcore] Multiple P-=
Access-Network-Info header in the same SIP request<o:p></o:p></span></p></d=
iv></div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><sp=
an style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>A=
re you referring to RFC3455 or to <a href=3D"https://datatracker.ietf.org/d=
oc/draft-drage-sipping-rfc3455bis/">https://datatracker.ietf.org/doc/draft-=
drage-sipping-rfc3455bis/</a></span><span style=3D'font-size:12.0pt;font-fa=
mily:"Times New Roman","serif"'><o:p></o:p></span></p><p class=3DMsoNormal>=
<span style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"'>&nbs=
p;<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:10.0p=
t;font-family:"Arial","sans-serif";color:blue'>Release 12 of 3GPP is refere=
ncing the latter document.</span><span style=3D'font-size:12.0pt;font-famil=
y:"Times New Roman","serif"'><o:p></o:p></span></p><p class=3DMsoNormal><sp=
an style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"'>&nbsp;<=
o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;f=
ont-family:"Arial","sans-serif";color:blue'>regards</span><span style=3D'fo=
nt-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p=
><p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times Ne=
w Roman","serif"'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal><span st=
yle=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Keith<=
/span><span style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"=
'><o:p></o:p></span></p><blockquote style=3D'border:none;border-left:solid =
blue 1.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;ma=
rgin-right:0in;margin-bottom:5.0pt'><p class=3DMsoNormal><span style=3D'fon=
t-size:12.0pt;font-family:"Times New Roman","serif"'><o:p>&nbsp;</o:p></spa=
n></p><div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><sp=
an style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"'><hr siz=
e=3D2 width=3D"100%" align=3Dcenter></span></div><p class=3DMsoNormal style=
=3D'margin-bottom:12.0pt'><b><span style=3D'font-size:10.0pt;font-family:"T=
ahoma","sans-serif"'>From:</span></b><span style=3D'font-size:10.0pt;font-f=
amily:"Tahoma","sans-serif"'> <a href=3D"mailto:sipcore-bounces@ietf.org">s=
ipcore-bounces@ietf.org</a> [<a href=3D"mailto:sipcore-bounces@ietf.org">ma=
ilto:sipcore-bounces@ietf.org</a>] <b>On Behalf Of </b>Surya Yarramilli<br>=
<b>Sent:</b> 04 November 2013 16:48<br><b>To:</b> <a href=3D"mailto:sipcore=
@ietf.org">sipcore@ietf.org</a><br><b>Subject:</b> [sipcore] Multiple P-Acc=
ess-Network-Info header in the same SIP request</span><span style=3D'font-s=
ize:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p><p =
class=3DMsoNormal>Hi,<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p><=
/p><p class=3DMsoNormal>According to RFC specification this header(PANI) sh=
ould be a single valued header, while in 3GPP specification, this header is=
 defined as multiple valued header. <o:p></o:p></p><p class=3DMsoNormal><o:=
p>&nbsp;</o:p></p><p class=3DMsoNormal>Normally we build our software follo=
wing SIP RFC specification. Actually even inside the 3GPP specification the=
 same RFC specification also has been referenced.<br>But there are differen=
ces between 3GPP spec and the RFC even though the 3GPP spec references the =
same RFC.&nbsp; So clearly there is an ambiguity here.<o:p></o:p></p><p cla=
ss=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Could you bring so=
me clarity on the SIP RFC spec and &nbsp;3GPP spec?<o:p></o:p></p><p class=
=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span style=3D'font-=
size:10.0pt;font-family:"Verdana","sans-serif"'>Thanks and Regards,</span><=
br><br><span style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif"'>=
Surya Yarramilli | Principal Software Engineer<br>ORACLE </span><o:p></o:p>=
</p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></blockquote></div></body></h=
tml>
--__1383675918760320872abhmt111.oracle.com--

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Thread-Topic: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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Subject: Re: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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From: Ivo Sedlacek <ivo.sedlacek@ericsson.com>
To: Andrew Allen <aallen@blackberry.com>, "adam@nostrum.com"
	<adam@nostrum.com>, Christer Holmberg <christer.holmberg@ericsson.com>,
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Subject: Re: [sipcore] Questions regarding use of REFER by RFC 6665
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Thread-Topic: [sipcore] Questions regarding use of REFER by RFC 6665
 compliant UAs
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Subject: Re: [sipcore] Multiple P-Access-Network-Info header in the same SIP request
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> From: "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>
> 
> RFC 3455 is probably not implemented. RFC 3455 as enhanced by 3GPP
> TS 24.229 is.

[That] may not be backward-compatible with the specification, but it
is backward-compatible with reality.  -- Francois Audet

Dale

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Subject: Re: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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> So the first question is if an RFC 6665 compliant UA indicated either
> Require: norefersub or knows that the REFER recipient supports
> norefersub and also indicates Refer-Sub: False in the REFER request
> can that REFER request be sent on a dialog created by another Method
> (in the safe knowledge that no subscription will be created)?

I think the question is poorly put.

I would describe a UA as "compliant with RFC 6665" if it does not
create new usages in an existing dialog.  However, sending a REFER
with norefersub does not *create* such a usage; it is the recipient of
the REFER that might do so.  (If norefersub is not present, you could
argue that the UA has *compelled* the remote UA to violate RFC 6665.)
And in any case, a UA has to be prepared (to some degree) to handle
attempted reuse of the dialog, unless it has out-of-band knowledge
that every possible far-end UA is compliant with RFC 6665 -- which it
doesn't.

(Note that handling the SUBSCRIBE could be as crude as rejecting it
with a 4xx.)

I think the category of UAs you want to describe is not "compliant
with RFC 6665", but "ensuring that no action it takes will cause the
remote UA to reuse a dialog, even if that UA is not compliant to RFC
6665".  That's a harder task, and it's not clear to me why you want to
do it.

Dale

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To: "Dale R. Worley" <worley@ariadne.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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Subject: Re: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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Hi Dale,

>> So the first question is if an RFC 6665 compliant UA indicated either
>> Require: norefersub or knows that the REFER recipient supports=20
>> norefersub and also indicates Refer-Sub: False in the REFER request=20
>> can that REFER request be sent on a dialog created by another Method=20
>> (in the safe knowledge that no subscription will be created)?
>
> I think the question is poorly put.
>
> I would describe a UA as "compliant with RFC 6665" if it does not create =
new usages in an existing dialog.  However, sending a REFER with norefersub=
 does not *create* such a usage; it is the recipient of the REFER that migh=
t do so.=20

Correct, and that is what the issue is about.

> (If norefersub is not present, you could argue that the UA has *compelled=
* the remote UA to violate RFC 6665.) And in any case, a UA has to be prepa=
red (to some degree) to handle=20
> attempted reuse of the dialog, unless it has out-of-band knowledge that e=
very possible far-end UA is compliant with RFC 6665 -- which it doesn't.

In the use-cases we are discussing "norefersub" IS present.

Regards,

Christer





(Note that handling the SUBSCRIBE could be as crude as rejecting it with a =
4xx.)

I think the category of UAs you want to describe is not "compliant with RFC=
 6665", but "ensuring that no action it takes will cause the remote UA to r=
euse a dialog, even if that UA is not compliant to RFC 6665".  That's a har=
der task, and it's not clear to me why you want to do it.

Dale
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Subject: Re: [sipcore] New sipcore draft submission draft-allen-sipcore-sip-tree-cap-indicators
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I think the concept of this draft is useful but not enough thought has
been put into the details of the proposed feature codes.

RFC 6809 says:

   The procedure by which features and capabilities are invoked
   are outside the scope of this specification and MUST be described by
   individual feature-capability indicator specifications.

This implies that we have to make sure we make clear the functional
significance of each FCI.  That sounds obvious, but there is always
the tendency to assume that the meaning of something is obvious and
that "The experienced user will know what is meant."

   For a given fc-value, as defined in Section 6.2.1, the order in which
   feature-capability indicators are listed has no significance.  For
   example, "foo;bar" and "bar;foo" have the same meaning (i.e., that
   the SIP entity that inserted the feature-capability indicator
   supports the features and capabilities associated with the "foo" and
   "bar" feature-capability indicators).

This shows that the implicit (but not stated) conceptual model of FCIs
is that they are independent of each other; there is no significance
to "foo" and "bar" appearing together beyond the semantics of "foo"
and "bar" taken individually.

It appears to me from a brief look that nothing will break if we allow
to be significant whether two FCIs appear together in the same
fc-value (comma-separated clause), but given that was *not* envisioned
in RFC 6809, we should avoid it if we can.

In regard to the draft itself and peoples' comments on it:

    My proposal is that I modify my draft to define that the sip tree
    FCIs are scoped to the entity that inserts them.

Unfortunately, this is un-implementable because the bytes in the SIP
header are not labeled as to which entity inserts them.  The scope
could be "to the fc-value in which it appears", or the "Feature-Cap
header in which it appears".  But the latter violates the rule in RFC
3261:

   Specifically, any SIP header whose grammar is of the form

      header  =  "header-name" HCOLON header-value *(COMMA header-value)

   allows for combining header fields of the same name into a comma-
   separated list.

And the former violates the spirit of RFC 6809 as discussed above.

But at this point in the discussion there is no sign that we need some
sort of scoping.

   RFC 6809 [1] provides that addresses of intermediaries can be
   communicated as a value of an associated feature-capability indicator
   so it would be appropriate to define feature capability indicators as
   part of the global tree to communicate the GRUU of the intermediary
   and hence this is outside the scope of this document.  The feature-
   capability indicators for communicating SIP related capabilities (e.g
   supported SIP Methods and extensions) though need to be registered in
   the SIP tree.

The import of this paragraph is unclear to me.  It appears that the
concept is that an FCI in the sip tree MAY NOT have a value which is
a URI via which the relevant intermediary can be contacted.  But I
know of no such rule.

As far as I can see, feature-capability indicators (RFC 6809) are a
different namespace from media feature tags (RFC 3840).  FCIs have a
different registry
(https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml#sip-parameters-72),
and the SIP tree part of that registry is empty.  So this draft should
not say "Feature-capability indicator specification reference: RFC
3840", as RFC 3840 defines media feature tags, not feature-capability
indicators.  Indeed, this difference is recognized in the following
paragraph:

   The following media feature tags from RFC 3840 [2], RFC 4235 [10] and
   RFC 5626 [11] are NOT considered to be useful to be defined as
   Feature-Capability indicators:

This assertion may or may not be true, but it seems to me to be
inviting controversy without adding value to the draft.  It would as
effective to simply note that this document does not define the listed
media tags as FCIs -- or even to omit their mention entirely.  If it
turns out to be useful to define them as FCIs, we can do so in another
document.

Getting to the meat of the issue, I think we need to do a more careful
analysis of the functional meaning of the proposed FCIs.  Let us start
by considering +sip.methods.  What can

    Feature-Caps: *;+sip.methods="invite"

mean?  We intuitively say "This intermediary supports/implements
INVITE."  But that isn't really actionable, since we don't send INVITE
*to* the intermediary.  And the statement is actually contrary to the
concept that the default SIP intermediary is a proxy which passes
through *all* methods -- does omitting +sip.methods mean that the
intermediary passes *no* methods?

What we really mean is "This intermediary passes *only* INVITE
requests; all request methods not listed will be rejected."

And that definition has clear functional semantics:  The UA knows that
the set of methods that it can use in the dialog can be determined by
intersecting the values of all of the +sip.methods FCIs and the value
of the Allow header (all of these values taken from any incoming
message).

A similar analysis can be done with +sip.extensions, +sip.events,
+sip.extensions, and +sip.schemes:  If such an FCI is specified, it
means that items of the given type but not in the list in the value
will be removed from SIP requests or will cause the requests to be
rejected.

We can extend this approach to the media feature tags which designate
mime types:

      sip.application
      sip.audio
      sip.text
      sip.video

      sip.control (grandfathered for SIP despite being removed by RFC 4566 sec 8.2.1)
      sip.data    (ditto)

What is needed is a +sip.types FCI which lists the *only* media types
that the intermediary is willing to support.  (And so if the
intermediary media-agnostic, it can simply omit +sip.types.)

If we do not handle all the MIME types as a group, we are stuck with
saying:

    Feature-Cap: *;+sip.audio;+sip.video

and interpreting that grouping to mean "one intermediary admits audio
and video (but nothing else)", which violates the spirit of RFC 6809.

So we want to use:

    Feature-Cap: *;+sip.types="audio,video"

+sip.app-subtype should be defined to list the *only* subtypes of
"application" that the intermediary is willing to pass.

The proposal for +sip.duplex already uses this approach.

+sip.description is curious.  I can see the usefulness of describing
an intermediary, but since each FCI is independent, that may not be
particularly useful information; it is not connected with any other
FCI.

The proposal for +sip.priority already uses this approach, since the
value of the FCI is the minimum priority that will be accepted, i.e.,
it states that all priorities below a given value will be rejected.
But the text does not consistently state this; e.g.

            non-urgent: Integral value of 10.  The device supports non-
            urgent calls.

            normal: Integral value of 20.  The device supports normal
            calls.

            urgent: Integral value of 30.  The device supports urgent
            calls.

            emergency: Integral value of 40.  The device supports calls
            in the case of an emergency situation.

These should be "The device admits calls of non-urgent priority and
above.", etc.

In regard to +sip.isfocus, the definition "This Feature-capability
indicator indicates that the intermediary is a conference server, also
known as a focus, and is capable of mixing together the media for all
calls to the same URI." is what we want, but the term "the
intermediary" is unbound.  What we need to require is that the FCI
contain a string value, "<URI-at-which-to-contact-focus>", which tells
what "the intermediary" is.

In regard to +sip.ice, this functionality is useful, but using it as
an FCI is probably not useful.  If an intermediary terminates media or
filters SDP, it should manipulate the +sip.ice media feature tag in
the Contact header and/or the "ice" option tag in the Supports header
to indicate ICE support.  The reason is that whether the UA can use
ICE is probably determined solely by whichever device exchanges RTP
with it, and for backward compatibility of UAs, UAs should be able to
rely on the previous indicators of whether ICE is supported.

(Although a similar argument could be made that the effect of the
+sip.methods FCI can be implemented by manipulating the Allows header,
and similarly for +sip.types (Content-Type header), +sip.app-subtype
(+sip.app-subtype media feature tag on Contact), and +sip.events
(Allow-Events header).)

In regard to +sip.fax, it seems that although the media feature tag
allows only the values "t38" and "passthrough", the FCI should allow a
list of values, because most or all intermediaries that support fax
will probably support both modes.

More subtly, there probably needs to be a "none" value for +sip.fax to
indicate that fax is not supported (and will be screened out) -- the
token-list value format (tag-value-list in RFC 3840) does not admit a
list of zero tokens.

(And at least in theory, there needs to be a "none" value for
+sip.events.)

Dale

From binod.pg@oracle.com  Wed Nov  6 20:34:06 2013
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Subject: Re: [sipcore] SIP/websocket: SIP Identity question
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I have few more further questions on this section.

1. The text in section 7 does not talk about which SIP header contains 
SIP identity that
     will be used for matching against the SIP Identity associated to 
the websocket
     connection. Section A.2 mentions it as From URI value. But A.2 is 
non-normative.
     So, will it be always From URI? In a discussion in SIP servlet 
expert group a question
     was asked, whether it can be P-Asserted-Identity. Can it be?

2. Doesn't the requirement for matching implies that the user can not 
use more than
     one SIP identity(eg: IMPU)?

3. If a user want to keep the SIP identity private/anonymous (RFC 3323), 
would the rule for
     matching the SIP identity still apply?

thanks,
Binod.

On 10/21/2013 9:50 AM, Binod wrote:
> Hi,
>
> Section 7 of sip/websocket says the following.
>
>    If SIP Digest authentication is not requested for SIP requests coming
>    from the SIP WebSocket Client, then the SIP WebSocket Server MUST
>    authorize SIP requests based on a previous Web or WebSocket login /
>    authentication procedure, and MUST validate that the SIP identity in
>    those SIP requests match the SIP identity associated to the WebSocket
>    connection.
>
> I assume, the "SIP identity associated to the WebSocket connection" is 
> not
> exactly the same as the "web identity" associated with the websocket 
> connection.
>
> The RFC draft does not explain how the SIP WebSocket Server maps the
> "web identity" (example: the username with which user logs into a 
> website)
> to the "sip identity".
>
> So, the "matching" specified in section 7, happens "after" a potential 
> mapping
> between "web identity" and "sip identity".
>
> Did I get it right?
>
> Hope draft is not mandating that username with which user logs into 
> the website
> must match with the sip identity present in the SIP request.
>
> thanks,
> Binod.
>
> _______________________________________________
> sipcore mailing list
> sipcore@ietf.org
> https://www.ietf.org/mailman/listinfo/sipcore


From internet-drafts@ietf.org  Thu Nov  7 10:27:24 2013
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Subject: [sipcore] I-D Action: draft-ietf-sipcore-rfc4244bis-callflows-08.txt
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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
 This draft is a work item of the Session Initiation Protocol Core Working =
Group of the IETF.

	Title           : Session Initiation Protocol (SIP) History-Info Header Ca=
ll Flow Examples
	Author(s)       : Mary Barnes
                          Francois Audet
                          Shida Schubert
                          Hans Erik van Elburg
                          Christer Holmberg
	Filename        : draft-ietf-sipcore-rfc4244bis-callflows-08.txt
	Pages           : 48
	Date            : 2013-11-07

Abstract:
   This document describes use cases and documents call flows which
   require the History-Info header field to capture the Request-URIs as
   a Session Initiation Protocol (SIP) Request is retargeted.  The use
   cases are described along with the corresponding call flow diagrams
   and messaging details.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-sipcore-rfc4244bis-callflows

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-sipcore-rfc4244bis-callflows-08

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-sipcore-rfc4244bis-callflows-=
08


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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Subject: Re: [sipcore] SIP/websocket: SIP Identity question
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On Nov 6, 2013, at 10:33 PM, binod pg <binod.pg@oracle.com> wrote:

> I have few more further questions on this section.
>=20
> 1. The text in section 7 does not talk about which SIP header contains =
SIP identity that
>    will be used for matching against the SIP Identity associated to =
the websocket
>    connection. Section A.2 mentions it as =46rom URI value. But A.2 is =
non-normative.
>    So, will it be always =46rom URI? In a discussion in SIP servlet =
expert group a question
>    was asked, whether it can be P-Asserted-Identity. Can it be?
>=20
> 2. Doesn't the requirement for matching implies that the user can not =
use more than
>    one SIP identity(eg: IMPU)?
>=20
> 3. If a user want to keep the SIP identity private/anonymous (RFC =
3323), would the rule for
>    matching the SIP identity still apply?
>=20
> thanks,
> Binod.

Congratulations. You have found the elephant in the room that others =
have been tiptoeing around without mentioning.

SIP Identity is broken, and needs to be fixed before any other standard =
can reasonably build on it. Most IMS systems will use the =
P-Asserted-Identity header for this role, but outside of IMS, it=92s =
absolute mayhem.

There=92s ongoing work in STIR on a completely analogous issue for =
telephone number identity assertions. It would be nice to converge on a =
unified approach.

=97
Dean=

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Thread-Topic: [sipcore] Questions regarding use of REFER by RFC 6665 compliant UAs
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Dale

My responses inline

Andrew

-----Original Message-----
From: sipcore-bounces@ietf.org [mailto:sipcore-bounces@ietf.org] On Behalf =
Of Dale R. Worley
Sent: Wednesday, November 06, 2013 2:59 PM
To: sipcore@ietf.org
Subject: Re: [sipcore] Questions regarding use of REFER by RFC 6665 complia=
nt UAs

> So the first question is if an RFC 6665 compliant UA indicated either
> Require: norefersub or knows that the REFER recipient supports =

> norefersub and also indicates Refer-Sub: False in the REFER request =

> can that REFER request be sent on a dialog created by another Method =

> (in the safe knowledge that no subscription will be created)?

I think the question is poorly put.

I would describe a UA as "compliant with RFC 6665" if it does not create ne=
w usages in an existing dialog.  However, sending a REFER with norefersub d=
oes not *create* such a usage; it is the recipient of the REFER that might =
do so.  (If norefersub is not present, you could argue that the UA has *com=
pelled* the remote UA to violate RFC 6665.) And in any case, a UA has to be=
 prepared (to some degree) to handle attempted reuse of the dialog, unless =
it has out-of-band knowledge that every possible far-end UA is compliant wi=
th RFC 6665 -- which it doesn't.

(Note that handling the SUBSCRIBE could be as crude as rejecting it with a =
4xx.)

I think the category of UAs you want to describe is not "compliant with RFC=
 6665", but "ensuring that no action it takes will cause the remote UA to r=
euse a dialog, even if that UA is not compliant to RFC 6665".  That's a har=
der task, and it's not clear to me why you want to do it.

[AA] My understanding is that a primary objective of RFC 6665 is to ensure =
that there is no creation of a new usages of an existing dialog going forwa=
rd (i.e dialog reuse is only allowed for interoperability with legacy UAs).=
 IMHO use of norefersub cannot ensure that that there is no creation of a n=
ew usage of an existing dialog as RFC 4488 indicates that as well as unders=
tanding norefersub the REFER receipient also needs to  be "willing" not to =
create a subscription. Therefore the only way in SIP to ensure that there i=
s no creation of a new usage of an existing dialog is to send the REFER out=
side of a dialog.

Dale
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From binod.pg@oracle.com  Mon Nov 11 01:18:57 2013
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Date: Mon, 11 Nov 2013 14:38:07 +0530
From: binod pg <binod.pg@oracle.com>
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Subject: Re: [sipcore] SIP/websocket: SIP Identity question
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 From  the sip/websocket draft perspective, "MUST" in the following sentence
is creating the confusion for a reader.

<snip>
    and*MUST*validate that the SIP identity in
    those SIP requests match the SIP identity associated to the WebSocket
    connection
</snip>


Either the spec should clearly state what the "SIP identity" actually mean (see
the questions below) or if everyone know that the "SIP identity" is broken and cannot be used
consistently, reword the sentence to not mandate the validation.

- Binod.

On 11/8/2013 11:27 AM, Dean Willis wrote:
> On Nov 6, 2013, at 10:33 PM, binod pg <binod.pg@oracle.com> wrote:
>
>> I have few more further questions on this section.
>>
>> 1. The text in section 7 does not talk about which SIP header contains SIP identity that
>>     will be used for matching against the SIP Identity associated to the websocket
>>     connection. Section A.2 mentions it as From URI value. But A.2 is non-normative.
>>     So, will it be always From URI? In a discussion in SIP servlet expert group a question
>>     was asked, whether it can be P-Asserted-Identity. Can it be?
>>
>> 2. Doesn't the requirement for matching implies that the user can not use more than
>>     one SIP identity(eg: IMPU)?
>>
>> 3. If a user want to keep the SIP identity private/anonymous (RFC 3323), would the rule for
>>     matching the SIP identity still apply?
>>
>> thanks,
>> Binod.
> Congratulations. You have found the elephant in the room that others have been tiptoeing around without mentioning.
>
> SIP Identity is broken, and needs to be fixed before any other standard can reasonably build on it. Most IMS systems will use the P-Asserted-Identity header for this role, but outside of IMS, its absolute mayhem.
>
> Theres ongoing work in STIR on a completely analogous issue for telephone number identity assertions. It would be nice to converge on a unified approach.
>
> 
> Dean
> _______________________________________________
> sipcore mailing list
> sipcore@ietf.org
> https://www.ietf.org/mailman/listinfo/sipcore


--------------000304040107000408050504
Content-Type: text/html; charset=windows-1252
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<html>
  <head>
    <meta content="text/html; charset=windows-1252"
      http-equiv="Content-Type">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <pre class="newpage" style="font-size: 1em; margin-top: 0px; margin-bottom: 0px; page-break-before: always; color: rgb(0, 0, 0); font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">From  the sip/websocket draft perspective, "MUST" in the following sentence
is creating the confusion for a reader.

&lt;snip&gt;
   and <b>MUST </b>validate that the SIP identity in
   those SIP requests match the SIP identity associated to the WebSocket
   connection
&lt;/snip&gt;


Either the spec should clearly state what the "SIP identity" actually mean (see
the questions below) or if everyone know that the "SIP identity" is broken and cannot be used
consistently, reword the sentence to not mandate the validation.

- Binod. 

</pre>
    <div class="moz-cite-prefix">On 11/8/2013 11:27 AM, Dean Willis
      wrote:<br>
    </div>
    <blockquote
      cite="mid:033FDA36-997D-4A72-B26A-979DCEDBC1F3@softarmor.com"
      type="cite">
      <pre wrap="">
On Nov 6, 2013, at 10:33 PM, binod pg <a class="moz-txt-link-rfc2396E" href="mailto:binod.pg@oracle.com">&lt;binod.pg@oracle.com&gt;</a> wrote:

</pre>
      <blockquote type="cite">
        <pre wrap="">I have few more further questions on this section.

1. The text in section 7 does not talk about which SIP header contains SIP identity that
   will be used for matching against the SIP Identity associated to the websocket
   connection. Section A.2 mentions it as From URI value. But A.2 is non-normative.
   So, will it be always From URI? In a discussion in SIP servlet expert group a question
   was asked, whether it can be P-Asserted-Identity. Can it be?

2. Doesn't the requirement for matching implies that the user can not use more than
   one SIP identity(eg: IMPU)?

3. If a user want to keep the SIP identity private/anonymous (RFC 3323), would the rule for
   matching the SIP identity still apply?

thanks,
Binod.
</pre>
      </blockquote>
      <pre wrap="">
Congratulations. You have found the elephant in the room that others have been tiptoeing around without mentioning.

SIP Identity is broken, and needs to be fixed before any other standard can reasonably build on it. Most IMS systems will use the P-Asserted-Identity header for this role, but outside of IMS, its absolute mayhem.

Theres ongoing work in STIR on a completely analogous issue for telephone number identity assertions. It would be nice to converge on a unified approach.


Dean
_______________________________________________
sipcore mailing list
<a class="moz-txt-link-abbreviated" href="mailto:sipcore@ietf.org">sipcore@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/sipcore">https://www.ietf.org/mailman/listinfo/sipcore</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>

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To: "sipcore@ietf.org" <sipcore@ietf.org>, Robert Sparks <rjsparks@nostrum.com>, Adam Roach <adam@nostrum.com>, Paul Kyzivat <pkyzivat@alum.mit.edu>
Thread-Topic: [sipcore] Question regarding use of single NOTIFY by RFC3515
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Date: Tue, 12 Nov 2013 18:46:59 +0000
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Subject: [sipcore]  Question regarding use of single NOTIFY by RFC3515
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Subject: Re: [sipcore] Question regarding use of single NOTIFY by RFC3515
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On 11/12/13 12:46 PM, marianne.mohali@orange.com wrote:
> Hi folks,
>
> I have a question because IMO there is a kind of gap in RFC 3515 for the following particular use case:
> RFC3515 makes the NOTIFY as mandatory to execute a REFER transaction (because of the implicit subscription).
> To end this subscription it is expected to receive a NOTIFY with “Subscription-State: terminated” with a reason of "noresource".
> The NOTIFY contains a body of type message/sipfrag and the status of the referred action (eg. 100 Trying, 200 OK…)
> And in the meantime, agents accepting REFER and not wishing to hold subscription state can terminate the subscription with the initial NOTIFY.
> So finally, if an agent wants to end the subscription with this initial/final NOTIFY it should send a NOTIFY with a subscription-state “terminated”, a reason “noresource” and a 100 TRYING body.
>
> Could you confirm this analysis because it sound inconsistent to have a “final” NOTIFY with a 100 Trying body?
This is a reasonable body to send.

The point is saying the best you can about the referred action when you 
have to say something.
The primary thing you want to do is avoid saying "this failed".

Since you aren't going to tell the other end whether the referenced 
action succeeded or not (or if you even are really going to try, though
you've said some of that by accepting the REFER), you might as well send 
a 200 OK in the sipfrag. You're already cutting off the opportunity
to do anything to recover if it fails.

But a 100 Trying is in the spirit and letter of the text.
I have no idea how well it would be received by the current 
implementation base.

RjS

>
> In the standard there is neither an example of a NOTIFY (100 TRYING) with a subscription-state “terminated” and a reason “noresource”, nor it is stated that it is forbidden…
>
> Here are some extracts from RFC3515:
>
> In 2.4.4
> "The creation of a subscription as defined by [2] always results in an immediate NOTIFY."
> […]
> “Note that agents accepting REFER and not wishing to hold subscription state can terminate the subscription with this initial NOTIFY.”
>
> In 2.4.5
> “If a NOTIFY is generated when the subscription state is pending, its body should consist only of a status line containing a response code of 100.”
>
> In 2.4.7
> “Each NOTIFY must contain a Subscription-State header field as defined in [2].  The final NOTIFY sent in response to a REFER MUST indicate the subscription has been "terminated" with a reason of "noresource". (The resource being subscribed to is the state of the referenced request).”
>
> In 3.4
> “As described in Section 2.4.7, the agent accepting the REFER will terminate the subscription when it reports the final result of the reference, indicating that termination in the Subscription-State header field.”
>
>
> If you can give me your opinion.
>
> Best Regards,
> Marianne Mohali
>
> _________________________________________________________________________________________________________________________
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From worley@shell01.TheWorld.com  Wed Nov 13 13:23:48 2013
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From: worley@ariadne.com (Dale R. Worley)
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Subject: Re: [sipcore] Question regarding use of single NOTIFY by RFC3515
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> From: <marianne.mohali@orange.com>
> 
> I have a question because IMO there is a kind of gap in RFC 3515 for
> the following particular use case:

> RFC3515 makes the NOTIFY as mandatory to execute a REFER transaction
> (because of the implicit subscription).

> To end this subscription it is expected to receive a NOTIFY with
> "Subscription-State: terminated" with a reason of "noresource".

> The NOTIFY contains a body of type message/sipfrag and the status of
> the referred action (eg. 100 Trying, 200 OK...)

> And in the meantime, agents accepting REFER and not wishing to hold
> subscription state can terminate the subscription with the initial
> NOTIFY. 

I suppose that the agent could do that, but it seems to me that is not
strictly conformant to RFC 3515.  The subscription is supposed to
continue until it delivers the final response to the generated INVITE.

> So finally, if an agent wants to end the subscription with this
> initial/final NOTIFY it should send a NOTIFY with a
> subscription-state "terminated", a reason "noresource" and a 100
> TRYING body. 

That probably would work in practice, but if a transferor (the sender
of the REFER) is designed to take some action based on receiving the
NOTIFY containing the final response to the generated INVITE, then if
the agent does not report that final response, the transferor might
not behave in the best manner.

Dale

From marianne.mohali@orange.com  Thu Nov 14 09:28:18 2013
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From: <marianne.mohali@orange.com>
To: "Dale R. Worley" <worley@ariadne.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Question regarding use of single NOTIFY by RFC3515
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Date: Thu, 14 Nov 2013 17:28:08 +0000
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Subject: Re: [sipcore] Question regarding use of single NOTIFY by RFC3515
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Thank you Dale and Robert,

You confirm my feeling and understanding of RFC3515 which is to distinguish=
 the notification process status (related to the subscription) and the Tran=
sfer progress status (related to SIP responses).

Obviously we are not in flavor of this behavior as we prefer to have a full=
 feedback on REFER request but we meet an AS vendor doing this early ending=
 and I would like to be sure of my understanding of their implementation.

Marianne

-----Message d'origine-----
De=A0: sipcore-bounces@ietf.org [mailto:sipcore-bounces@ietf.org] De la par=
t de Dale R. Worley
Envoy=E9=A0: mercredi 13 novembre 2013 22:22
=C0=A0: sipcore@ietf.org
Objet=A0: Re: [sipcore] Question regarding use of single NOTIFY by RFC3515

> From: <marianne.mohali@orange.com>
>=20
> I have a question because IMO there is a kind of gap in RFC 3515 for=20
> the following particular use case:

> RFC3515 makes the NOTIFY as mandatory to execute a REFER transaction=20
> (because of the implicit subscription).

> To end this subscription it is expected to receive a NOTIFY with
> "Subscription-State: terminated" with a reason of "noresource".

> The NOTIFY contains a body of type message/sipfrag and the status of=20
> the referred action (eg. 100 Trying, 200 OK...)

> And in the meantime, agents accepting REFER and not wishing to hold=20
> subscription state can terminate the subscription with the initial=20
> NOTIFY.

I suppose that the agent could do that, but it seems to me that is not stri=
ctly conformant to RFC 3515.  The subscription is supposed to continue unti=
l it delivers the final response to the generated INVITE.

> So finally, if an agent wants to end the subscription with this=20
> initial/final NOTIFY it should send a NOTIFY with a subscription-state=20
> "terminated", a reason "noresource" and a 100 TRYING body.

That probably would work in practice, but if a transferor (the sender of th=
e REFER) is designed to take some action based on receiving the NOTIFY cont=
aining the final response to the generated INVITE, then if the agent does n=
ot report that final response, the transferor might not behave in the best =
manner.

Dale
_______________________________________________
sipcore mailing list
sipcore@ietf.org
https://www.ietf.org/mailman/listinfo/sipcore

___________________________________________________________________________=
______________________________________________

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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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Thank you.


From brett@broadsoft.com  Thu Nov 14 09:40:10 2013
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From: Brett Tate <brett@broadsoft.com>
To: "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Question regarding use of single NOTIFY by RFC3515
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Subject: Re: [sipcore] Question regarding use of single NOTIFY by RFC3515
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> I suppose that the agent could do that, but it seems=20
> to me that is not strictly conformant to RFC 3515. =20
> The subscription is supposed to continue until it=20
> delivers the final response to the generated INVITE.

RFC 3515 section 2.4.5 describes the behavior as "minimal, but complete".

"A minimal, but complete, implementation can respond with a single
 NOTIFY containing either the body:

      SIP/2.0 100 Trying

   if the subscription is pending, the body:

      SIP/2.0 200 OK

   if the reference was successful, the body:

      SIP/2.0 503 Service Unavailable

   if the reference failed, or the body:

      SIP/2.0 603 Declined"


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Subject: Re: [sipcore] Question regarding use of single NOTIFY by RFC3515
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> From: Brett Tate <brett@broadsoft.com>
> 
> > I suppose that the agent could do that, but it seems 
> > to me that is not strictly conformant to RFC 3515.  
> > The subscription is supposed to continue until it 
> > delivers the final response to the generated INVITE.
> 
> RFC 3515 section 2.4.5 describes the behavior as "minimal, but complete".
> 
> "A minimal, but complete, implementation can respond with a single
>  NOTIFY containing either the body:
> 
>       SIP/2.0 100 Trying
> 
>    if the subscription is pending, the body:
> 
>       SIP/2.0 200 OK
> 
>    if the reference was successful, the body:
> 
>       SIP/2.0 503 Service Unavailable
> 
>    if the reference failed, or the body:
> 
>       SIP/2.0 603 Declined"
>
[adding the remainder of the sentence in RFC 3515:]
   if the REFER request was accepted before approval to follow the
   reference could be obtained and that approval was subsequently denied
   (see Section 2.4.7).

I hadn't remembered that section.

In the ordinary cases, the choice described in 2.4.5 would be between
the second and the third example responses, because the subscription
would never be pending (the UA would grant it without user approval)
and user approval of following the REFER would also not be needed.

Which means that section 2.4.5 essentially says that a minimal but
complete implementation would provide one NOTIFY, containing either a
sipfrag with a success response code or a sipfrag with a failure
response code.  This leads back to the idea that the subscription must
continue until it can report either success or failure.

Normally a prompt NOTIFY is required upon establishment of a
subscription, but I suppose that is only if it is established via a
SUBSCRIBE.  Looking at RFC 6665 section 4.2 more or less supports
that.

Dale

From brett@broadsoft.com  Thu Nov 14 12:10:09 2013
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From: Brett Tate <brett@broadsoft.com>
To: "Dale R. Worley" <worley@ariadne.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Question regarding use of single NOTIFY by RFC3515
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Subject: Re: [sipcore] Question regarding use of single NOTIFY by RFC3515
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Hi Dale,

It sounds like we disagree about RFC 3515 allowing a single NOTIFY to both =
terminate the subscription and communicate a 100 Trying body.  In my opinio=
n, the 100 Trying body sounds appropriate for the following NOTIFY since al=
l of the other response codes would be misleading concerning the "status of=
 the referred action".

Section 2.4.4:

"Note that agents accepting REFER and not wishing to hold
 subscription state can terminate the subscription with this initial
 NOTIFY."

Similarly, we disagree about how to interpret section 2.4.5's "if the subsc=
ription is pending".  My interpretation is that it indicates that the NOTIF=
Y has not been sent instead of that the NOTIFY's Subscription-State header =
would indicate "pending".  As the section 4 examples indicate, the 100 Tryi=
ng is not limited to Subscription-State "pending".

Thanks,
Brett


From worley@shell01.TheWorld.com  Fri Nov 15 11:27:11 2013
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From: worley@ariadne.com (Dale R. Worley)
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Subject: Re: [sipcore] Question regarding use of single NOTIFY by RFC3515
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> From: Brett Tate <brett@broadsoft.com>

> Section 2.4.4:
> 
> "Note that agents accepting REFER and not wishing to hold
>  subscription state can terminate the subscription with this initial
>  NOTIFY."

That sentence settles what I see as the main question:  The receiver
of the REFER is allowed to send one NOTIFY, promptly, that terminates
the "refer" subscription.  I had not known that that was allowed under
a strict reading of the RFC.  I had assumed that the notifier was
required to maintain the subscription until the reference succeeded or
failed.

There is a secondary question of whether the notifier is required to
send a NOTIFY immediately.  The procedures in 3265 only describe that
when a SUBSCRIBE is received, a NOTIFY must be sent promptly.  In RFC
3515 section 2.4.4 is:

   The creation of a subscription as defined by [2] always results in an
   immediate NOTIFY.  Analogous to the case for SUBSCRIBE described in
   that document, the agent that issued the REFER MUST be prepared to
   receive a NOTIFY before the REFER transaction completes.

Unfortunately, the wording of the first sentence can be interpreted as
the "creation of a subscription as defined by RFC 3265", that is, by
means of SUBSCRIBE, "always results in an immediate NOTIFY" -- which
doesn't speak to our question.  But later text:

   The duration
   of the subscription is chosen by the agent accepting the REFER and is
   communicated to the agent sending the REFER in the subscription's
   initial NOTIFY (using the Subscription-State expires header
   parameter).

presupposes that there will be a prompt NOTIFY, so it seems that RFC
3515 prescribes that the notifier will send a NOTIFY promptly after
reveiving a REFER.

It's clear from the discussion in RFC 3515 that a body of "100 Trying"
is the correct body to use if the notifier has not yet received a
response to the generated INVITE (perhaps not even having sent it yet).

> It sounds like we disagree about RFC 3515 allowing a single NOTIFY
> to both terminate the subscription and communicate a 100 Trying
> body.

Once it's agreed that the notifier can send a NOTIFY promptly that
terminates the subscription, it's clear that "100 Trying" is the
body to use (unless another response has been received).

> Similarly, we disagree about how to interpret section 2.4.5's "if
> the subscription is pending".  My interpretation is that it
> indicates that the NOTIFY has not been sent instead of that the
---------------------^
I think you mean "INVITE" here.
> NOTIFY's Subscription-State header would indicate "pending".  As the
> section 4 examples indicate, the 100 Trying is not limited to
> Subscription-State "pending".

To recap, the text in question starts:

   A minimal, but complete, implementation can respond with a single
   NOTIFY containing either the body:

      SIP/2.0 100 Trying

   if the subscription is pending, [additional cases follow]

It's a good question.  Given that "pending" is a technical term
regarding subscriptions, I believe that the intention of this clause
is that if the subscription is pending (that is, if the user needs to
approve and has not yet), then "100 Trying" should be used as a
"neutral" body value.  And that's what the preceding paragraph says:

   If a NOTIFY is generated when the subscription state is pending, its
   body should consist only of a status line containing a response code
   of 100.

What you're raising is a case that isn't handled in the text in
question.  What is really wanted is for it to state "the body 'SIP/2.0
100 Trying' if the reference is pending".

Dale

From iesg-secretary@ietf.org  Mon Nov 25 09:21:03 2013
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Subject: [sipcore] Last Call: <draft-rosen-rph-reg-policy-01.txt> (Resource Priority Header (RPH) Registry Management Policy to IETF Review) to Proposed Standard
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The IESG has received a request from the Session Initiation Protocol Core
WG (sipcore) to consider the following document:
- 'Resource Priority Header (RPH) Registry Management Policy to IETF
   Review'
  <draft-rosen-rph-reg-policy-01.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2013-12-09. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


   RFC4412 defines "Resource-Priority Namespaces" and "Resource-Priority
   Priority-values" registries.  The management policy of these
   registries is "Standards Action".  This document normatively updates
   RFC4412 ti change the management policy of these registries to "IETF
   Review".




The file can be obtained via
http://datatracker.ietf.org/doc/draft-rosen-rph-reg-policy/

IESG discussion can be tracked via
http://datatracker.ietf.org/doc/draft-rosen-rph-reg-policy/ballot/


No IPR declarations have been submitted directly on this I-D.



From ibc@aliax.net  Thu Nov 28 18:03:05 2013
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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Fri, 29 Nov 2013 03:02:41 +0100
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Subject: Re: [sipcore] SIP/websocket: SIP Identity question
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2013/11/11 binod pg <binod.pg@oracle.com>:
> From  the sip/websocket draft perspective, "MUST" in the following senten=
ce
> is creating the confusion for a reader.
>
> <snip>
>    and MUST validate that the SIP identity in
>    those SIP requests match the SIP identity associated to the WebSocket
>    connection
> </snip>
>
>
> Either the spec should clearly state what the "SIP identity" actually mea=
n
> (see
> the questions below) or if everyone know that the "SIP identity" is broke=
n
> and cannot be used
> consistently, reword the sentence to not mandate the validation.

I agree and such a sentence is removed for the next version of the
draft (to be published in a few minutes).

I've been thinking on it a lot and definitely it makes no sense at all
to assume that there are "webSocket user" and "SIP user", even less
than they "should match".


--=20
I=C3=B1aki Baz Castillo
<ibc@aliax.net>

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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
 This draft is a work item of the Session Initiation Protocol Core Working =
Group of the IETF.

	Title           : The WebSocket Protocol as a Transport for the Session In=
itiation Protocol (SIP)
	Author(s)       : Inaki Baz Castillo
                          Jose Luis Millan Villegas
                          Victor Pascual
	Filename        : draft-ietf-sipcore-sip-websocket-10.txt
	Pages           : 24
	Date            : 2013-11-28

Abstract:
   The WebSocket protocol enables two-way realtime communication between
   clients and servers in web-based applications.  This document
   specifies a WebSocket sub-protocol as a reliable transport mechanism
   between SIP (Session Initiation Protocol) entities to enable usage of
   SIP in web-oriented deployments.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-sipcore-sip-websocket

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-sipcore-sip-websocket-10

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-sipcore-sip-websocket-10


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From ibc@aliax.net  Thu Nov 28 18:41:03 2013
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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Fri, 29 Nov 2013 03:40:40 +0100
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To: "SIPCORE (Session Initiation Protocol Core) WG" <sipcore@ietf.org>
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Subject: Re: [sipcore] I-D Action: draft-ietf-sipcore-sip-websocket-10.txt
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2013/11/29  <internet-drafts@ietf.org>:
>
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
>  This draft is a work item of the Session Initiation Protocol Core Workin=
g Group of the IETF.
>
>         Title           : The WebSocket Protocol as a Transport for the S=
ession Initiation Protocol (SIP)
>         Author(s)       : Inaki Baz Castillo
>                           Jose Luis Millan Villegas
>                           Victor Pascual
>         Filename        : draft-ietf-sipcore-sip-websocket-10.txt
>         Pages           : 24
>         Date            : 2013-11-28
>
> Abstract:
>    The WebSocket protocol enables two-way realtime communication between
>    clients and servers in web-based applications.  This document
>    specifies a WebSocket sub-protocol as a reliable transport mechanism
>    between SIP (Session Initiation Protocol) entities to enable usage of
>    SIP in web-oriented deployments.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-sipcore-sip-websocket
>
> There's also a htmlized version available at:
> http://tools.ietf.org/html/draft-ietf-sipcore-sip-websocket-10



Hi,

The changelog for the version 10 of the draft is the following:


- Removed "_This section is non-normative_" at the top of
non-normative sections (those don't include normative keywords so they
are already non-normative).

- Use "RECOMMENDED" instead of "recommended" in section "Secure
WebSocket Connection" under "Security Considerations" (thanks to
Stephen Farrell).

- RFC 5246 (TLS Protocol Version 1.2) moved to normative references
(thanks to Stephen Farrell).

- Remove indentation of second paragraph in "WebSocket SIP
Sub-Protocol -> Handshake" section (thanks to Benoit Claise).

- Improvements and fixes in normative text (thanks to Pete Resnick).

- Replace "optional" with "not necessary" when talking about
Content-Length header (thanks to Pete Resnick).

- Remove "updates RFC 3261" given that an implementor of a SIP
UDP/TCP/TLS device does not need to know about SIP WebSocket transport
(requested by Stephen Farrell and others).

- Clarify that UTF-8 encoding is RECOMMENDED (given JavaScript and
WebSocket nature).

- Many changes in "Authentication" section, by making some MTI
authentication mechanisms (thanks to Pete Resnick).

- RFC 2617 (HTTP authentication) and RFC 6265 (HTTP Cookies) moved to
Normative References.

- Removed the text about "matching Web/WebSocket identity and SIP
identity" as it just makes sense in specific usecases (thanks to
Binod).


I'm really sorry for the delay in posting this new revision of the
draft. As always, your comments and feedback are welcome.

Thanks to all the members in the group.
Best regards.






--
I=C3=B1aki Baz Castillo
<ibc@aliax.net>
