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From: "Vijay K. Gurbani" <vkg@lucent.com>
Organization: Wireless Networks Research and Development
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Subject: [Iptel] Re: [Sip] draft-ietf-iptel-trunk-group-00.txt
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Date: Mon, 01 Dec 2003 09:19:14 -0600
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Medhavi Bhatia wrote:
> Vijay and Cullen - Thanks for the quick response!
>  
> One comment we had concerned the syntax used in the Contact header, 
> which does not conform to the tel -> sip url conversion specified in RFC 
> 3261. The placement of tgrp= in the examples in section 5 seems to be in 
> the url parameters whereas we think it should be in the user parameters.

Medhavi:

This was already identified as a bug and has been corrected
in the latest rev.

> Also the draft has tried to specify the format of the trunk group 
> identifier and include the notion of namespace in it. I had some 
> discussion with one of our partners who pointed out that even within an 
> administrative domain, chances are that trunk groups may clash due to 
> misconfiguration. His suggestion was to make the user configuration 
> unique by appending a switch identifier which is normally unique, 
> thereby altering the syntax of the identifier. Is that something that is 
> being considered at this point ? We would like to get involved.

That's a good consideration, however, we would have a hard time
making it part of any standardization.  What followed the "tgrp="
was a token, and as such can be constructed in any manner so as
to render it unique within a given organizational boundary (or
cross-organization boundaries).  Using a switch identifier as
a prefix, as you note above, is one means to impart uniqueness
to the token.

We can have more discussions on this aspect after you have
digested the rev'ed I-D later on this week.

Thanks for your comments and interest.

Cheers,

- vijay
-- 
Vijay K. Gurbani  vkg@{lucent.com,research.bell-labs.com,acm.org}
Wireless Networks Group/Internet Software and Services
Lucent Technologies/Bell Labs Innovations, 2000 Lucent Lane, Rm 6G-440
Naperville, Illinois 60566     Voice: +1 630 224 0216


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From: "Medhavi Bhatia" <mbhatia@nextone.com>
To: "Vijay K. Gurbani" <vkg@lucent.com>
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Subject: [Iptel] Re: [Sip] draft-ietf-iptel-trunk-group-00.txt
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Date: Mon, 1 Dec 2003 00:33:39 -0500

This is a multi-part message in MIME format.

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Vijay and Cullen - Thanks for the quick response!

One comment we had concerned the syntax used in the Contact header, which
does not conform to the tel -> sip url conversion specified in RFC 3261. The
placement of tgrp= in the examples in section 5 seems to be in the url
parameters whereas we think it should be in the user parameters.

Also the draft has tried to specify the format of the trunk group identifier
and include the notion of namespace in it. I had some discussion with one of
our partners who pointed out that even within an administrative domain,
chances are that trunk groups may clash due to misconfiguration. His
suggestion was to make the user configuration unique by appending a switch
identifier which is normally unique, thereby altering the syntax of the
identifier. Is that something that is being considered at this point ? We
would like to get involved.

Thanks - Medhavi.
  ----- Original Message ----- 
  From: Vijay K. Gurbani
  To: Medhavi Bhatia
  Cc: iptel@ietf.org
  Sent: Sunday, November 30, 2003 11:00 PM
  Subject: Re: [Sip] draft-ietf-iptel-trunk-group-00.txt


  Medhavi Bhatia wrote:
  > Folks,
  >
  > Is this draft being revived ? We had some questions/comments on the
  > syntax specified in it and were wondering if this was being worked on or
  > dropped.
  >
  > Medhavi.

  Medhavi:

  This work is being done in the IPTEL WG.  The work
  continues; at the 58th IETF in Minneapolis, there
  were some discussions between the authors.
  The result of these is a new revision to the I-D.
  The ball is now in my court; I am working on
  incorporating some previous comments and our
  discussions at the 58th IETF.  I plan to
  have the rev'ed I-D to the co-authors by the middle
  of the first week of December and to the IPTEL WG
  list shortly thereafter.

  So, please stay tuned till next week.


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2800.1276" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DCourier size=3D2>Vijay and Cullen - Thanks for the =
quick=20
response!</FONT></DIV>
<DIV><FONT face=3DCourier size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DCourier size=3D2>One comment we had concerned the =
syntax used in=20
the Contact header, which does not conform to the tel -&gt; sip url =
conversion=20
specified in RFC 3261. The placement of tgrp=3D in the examples in =
section 5 seems=20
to be in the url parameters whereas we think it should be in the user=20
parameters. </FONT></DIV>
<DIV><FONT face=3DCourier size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DCourier size=3D2>Also&nbsp;the draft&nbsp;has tried to =
specify the=20
format of the trunk group identifier and include the notion of namespace =
in it.=20
I had some discussion with one of our partners who pointed out that even =
within=20
an administrative domain, chances are that trunk groups may clash due to =

misconfiguration. His suggestion was to make the user configuration =
unique=20
by&nbsp;appending a switch identifier which is normally unique, thereby =
altering=20
the syntax of the identifier. Is that something that is being considered =
at this=20
point ? We would like to get involved.</FONT></DIV>
<DIV><FONT face=3DCourier size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DCourier size=3D2>Thanks - Medhavi.</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dvkg@lucent.com href=3D"mailto:vkg@lucent.com">Vijay K. =
Gurbani</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dmbhatia@nextone.com=20
  href=3D"mailto:mbhatia@nextone.com">Medhavi Bhatia</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A title=3Diptel@ietf.org=20
  href=3D"mailto:iptel@ietf.org">iptel@ietf.org</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, November 30, 2003 =
11:00=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [Sip]=20
  draft-ietf-iptel-trunk-group-00.txt</DIV>
  <DIV><BR></DIV>Medhavi Bhatia wrote:<BR>&gt; Folks,<BR>&gt;&nbsp; =
<BR>&gt; Is=20
  this draft being revived ? We had some questions/comments on the =
<BR>&gt;=20
  syntax specified in it and were wondering if this was being worked on =
or=20
  <BR>&gt; dropped.<BR>&gt;&nbsp; <BR>&gt; =
Medhavi.<BR><BR>Medhavi:<BR><BR>This=20
  work is being done in the IPTEL WG.&nbsp; The work<BR>continues; at =
the 58th=20
  IETF in Minneapolis, there<BR>were some discussions between the=20
  authors.<BR>The result of these is a new revision to the I-D.<BR>The =
ball is=20
  now in my court; I am working on<BR>incorporating some previous =
comments and=20
  our<BR>discussions at the 58th IETF.&nbsp; I plan to<BR>have the =
rev'ed I-D to=20
  the co-authors by the middle<BR>of the first week of December and to =
the IPTEL=20
  WG<BR>list shortly thereafter.<BR><BR>So, please stay tuned till next=20
  week.<BR><BR></BLOCKQUOTE></BODY></HTML>

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Subject: [Iptel] Comments on draft-yu-tel-url-08
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Date: Fri, 12 Dec 2003 21:16:20 -0500
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I've taken a closer look at the draft-yu-tel-url-08.txt and have some
questions and comments on it.

Non-Editorial Comments:
- The document is fairly focused on how you can use the tel-URL
extensions defined here in SIP. At least in the Abstract and Section 1,
I'd suggest loosening this coupling a bit as the subject of the document
is the tel-URL extensions rather than how to use them with SIP. Also, it
might be worthwhile making it clear, that these extensions can be used
with any protocol that happens to make use of the tel-URL, e.g. H.323 as
well. In line with this, I'd suggest removing Section 8.

- Lack of requirements: While reading through the document, I felt that
the document was a bit "loose" in some places and relied on the reader
just knowing how these things work. It then occurred to me, that there
is not a single RFC 2119 requirements word to be found in the document
which doesn't seem quite right. I'd suggest taking another pass and
adding some RFC 2119 requirement words throughout (or at least in
Section 5 where firmer language and additional detail is generally
needed).

- JIP Parameter: It is listed in the Abbreviations section but not
referenced in the doc. That's of course a minor issue but there is a
bigger issue of whether we should have support for the JIP parameter as
I don't believe you have full support for LNP without it (billing
problem when originator has been ported if I understand correctly).

- Section 5, second last paragraph states that:
   "The "CIC" can be expanded to include VoIP carriers and other types
   of carriers in the same country or under the same country code so
   that all carriers can be identified in the IP domain for routing
   purpose."
I don't quite understand what this means. Is this something the document
defines and if so how ? Either way, this should be clarified.

- Section 6.1, last paragraph:    I don't follow the recommendation. The
example just above the text that talks about "the example described
above" does not show the "rn" parameter, and if the "rn" parameter is
not included in the previous example, I'm not sure how it would work.
Please elaborate.

- Section 9: The security considerations should provide guidelines for
how to remedy the threats identified.


General editorial comments:
- There are numerous format/conversion problems throughout the document
(doesn't look like pure ASCII).
- Use of commas and periods inside or outside double-quotes. This is
clearly a style issue with no universally agreed upon rules, but clarity
argues for placing them outside the quotes when you are referencing a
literal value rather than quoting a piece of text, i.e. "rn," should
rather be "rn", IMO.
- Should probably also reference Security Considerations section at the
end of Section 1.
- The document treats POTS and free-phone numbers as two different
things; are they ? See for example, Section 1, 2nd paragraph.
- The document talks about the extensions as being "proposed". May want
to reword to "defined" or something like that.


Detailed editorial comments:

p. 1
OLD: ABTRACT
NEW: ABSTRACT

Section 1, 3rd paragraph
OLD: associate
NEW: associated

Abbreviations:
OLD: Telephony Routing Information Protocol
NEW: Telephony Routing over IP

OLD: Uniform Resource Locators
NEW: Uniform Resource Locator

Section 4, 2nd and 3rd paragraph (i.e. twice)

OLD: POT number
NEW: POTS number

Section 5, ABNF
OLD: ";rn"
NEW: "rn"

Section 5, 2nd paragraph after ABNF:
OLD: identify a country code
NEW: identify an E.164 country code

Section 5, 4th paragraph after ABNF:
The sentence:
   "It is also possible that the SIP protocol can be used for the NP
query.
   In that case, the response (e.g., 302 Moved) to the SIP message may
   carry the NP related information in the "tel" or "sip" URL format
   with the parameters proposed in this document."
doesn't belong in this document IMO (unless you want to define that
mechanism here as well).

Section 5, 5th paragraph after ABNF:
   "A new address family in the Telephony Routing Information Protocol
(TRIP)[7] has
   been defined for cic."
Where is this defined - is there a reference ?

Regards

       Flemming



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From: "Brett Tate" <brett@broadsoft.com>
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I have reviewed draft-mahy-iptel-cpc-00; and
I have no real comments.  I am mainly only posting 
this in response to the following email to help 
progress the draft since the cpc parameter is 
being used by various vendors.

http://www.ietf.org/mail-archive/working-groups/iptel/current/msg00464.html


Section 2 of draft-mahy-iptel-cpc-00 mentions 
that the following are potential additional 
values: hospital, police, cellular, 
and cellular-roaming.  Does the resolution
concerning finding a "stable reference" have 
to be provided prior the draft becoming an RFC?


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Hi,

The issue I had with this draft is what happens if the phone number is
unavailable? How do you convey CPC information?  2806bis02 currently
does not allow the number itself to be absent. But conceptually it
twists the logic a bit to make CPC dependent on calling party number
which, like CPC, is one of many parameters that collectively describe
call origination point.

BTW, the above comment applies to draft-ietf-iptel-trunk-group-00.txt as
well when that extension is used in Contact header.

Thanks, Shan Lu    


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Folks,

Enclosed are the proposed minutes for the iptel meeting at IETF 58. 
Thanks to Tom Taylor for taking good notes here. We need to submit 
these for the proceedings tomorrow; so if you have any comments, 
please send them asap. APologies for the lateness in getting these out.

Thanks,
Jonathan R.


--------------



IETF 58 IPTEL Meeting Minutes
Reported by Tom Taylor <taylor@nortelnetworks.com>

The IPTEL Working Group met on Wednesday morning, 12 Novemeber.  The
meeting was chaired by Cullen Jennings <fluffy@cisco.com> and Jonathan
Rosenberg <jdrosen@dynamicsoft.com>.

The agenda was accepted as proposed:
  1) 10 minute status update
  2) user=phone discussion.

1. Status
    ======
Cullen Jennings presented.

CPL (draft-ietf-iptel-cpl-08.txt)

The draft was reworked to remove dependencies on caller prefs.  The
XML basis was changed to Schema from DTD. WG Last Call is complete.
Will send to IESG for reinsertion into the RFC Editor's queue.

RFC2806bis (draft-ietf-iptel-rfc2806bis-02.txt)

The draft has completed WG Last Call.  It will be submitted to the
IESG unless the discussion regarding the user=phone parameter leads to
changes.

TGREP (draft-ietf-iptel-tgrep-02.txt)

The draft is ready for final NITS review, WG Last Call.

TRIP MIB (draft-ietf-iptel-trip-mib-09.txt)

After lots of discussion back and forth between the editors and the
MIB doctor, another revision has come out.  The document is now ready
for sending to the IESG.

Other stuff:

Calling Party's Category tel: URI parameter (draft-mahy-iptel-cpc-00.txt)
tel: URI parameters (draft-yu-tel-url-08.txt)
trunk group (draft-ietf-iptel-trunk-group-00.txt)

Need expressions of interest to take these forward.

Tom Taylor mentioned that the Yu and Mahy drafts were of particular
interest to those working on interworking of SIP to the PSTN.
Jonathan responded that the question is whether the proposed
functionality is needed in the SIP network.  Flemming Andreasen
<fandreas@cisco.com> and Richard Stastny <Richard.Stastny@oefeg.at>
indicated their interest in those drafts.  Another speaker indicated
his interest in the trunk group draft.

Cullen said he would contact James Yu to see if he was still
interested in carrying his draft forward.  Jon Peterson indicated that
James was still interested, but had some concern on the content of
2806bis.

Jonathan emphasized that he was only prepared to add these drafts as
WG items if he sees interest on the list. He asked for list comments
and/or document revisions by mid-December, or we would not continue.

A milestones update slide was presented.  The chairs are looking to
close the WG by March.  There was no comment on the proposed
milestones.


2) user=phone discussion
    =====================

Rohan Mahy <rohan@cisco.com> presented the issue based on slides
worked out between him and Brian Rosen <Brian.Rosen@marconi.com>.
These slides reflected the results of discussion on the SIPPING list,
also captured by Rohan's draft
(draft-mahy-sipping-user-equals-phone-00.txt).

There is just one major point of disagreement.

The points of agreement:

a) Don't mess with the user part of a SIP URI that isn't yours.

b) Some SIP domains have user parts which are numbers.  Sometimes
these can conflict with phone numbers.

c) Some people need user=phone.

Disagreement: how to distinguish "dial strings" from phone numbers.

The subsequent discussion was lively and wide ranging.  The following
notes capture a number of the points, but not all of them.

Tom Taylor noted that number transformations occur at various points
along the call path, not just at the first hop.

Brian Rosen pointed out that user=phone is broken no matter what, and
his proposed fix is one way to solve the problem.

Two speakers expressed the view that interoperability is more likely
to be achieved if the approach taken was to use separate phone
contexts for telephone numbers and dial strings.

Francois Audet <audet@nortelnetworks.com> asked why the proposed
dialstring syntax used E and F rather than * and #.  It appears that
2806bis doesn't allow * and #.

Henning Schulzrinne <hgs@cs.columbia.edu> expressed a preference for
explicit semantics hence, in this case, allowing the user=dialstring
parameter.

Someone remarked that if you don't want to put phone-context in, then
you shouldn't set user=phone.

Jonathan Rosenberg wondered how developer could distinguish a
telephone number from a dial string if the IETF cannot.  Context
defines a name space.  That should be adequate.

Dean Willis <dean.willis@softarmor.com> made the point that "9,411" is
actually a request for a gateway to provide a specific service --
outpulsing according to a specific cadence.  This is a specific
instance of the general class of service requests.

Brian Rosen picked up Dean's point and elaborated on it.  He has a
further need: to provide guidance to a proxy server that serves
multiple domains.

Henning said this provided further support for user=dialstring; it is
a parameter pointing to a specific operation.

Richard Stastny added his support for user=dialstring because phones
cannot dial E.164 numbers.

Dick Knight <dick.rr.knight@bt.com> pointed out that this was
effectively pushing the distinction problem back to the UA.

Another person pointed out we already have two mechanisms to transmit
the requirement to pause: KPML and 2833.  We don't need another.

Tom Taylor repeated his point that the network may need to do number
translation beyond the first hop -- hence it is desirable to have a
general mechanism to indicate that the user part is in a
context-specific form.

Richard Stastny agreed that digit manipulation is definitely needed at
the first hop, but shouldn't be needed thereafter.

Brian Rosen explained why KPML wouldn't work.  It is easier to get
user=dialstring to work.

Francois Audet expressed his view that allowing user=dialstring not a
big deal.  Pause is a different discussion.

At this point the chairs used a series of hums to determine the
general opinion of the meeting.

   a) agreed: the presence of the user=phone parameter implies that the
   user part conforms to the specification of the tel: URI.

   b) agreed: user=dialstring accepted as a new SIP URI
   parameter. (Pause is a separate discussion.)  Further to this last
   point there were some strong objections to NOT allowing
   user=dialstring, little in the way of strong objection to
   user=dialstring.  The chairs decared consensus on that point.

Brian Rosen volunteered to write a draft defining user=dialstring.
This will be an individual contribution to SIPPING, to be considered
at the request of IPTEL.

There was a split view on whether getting pauses to the gateway is a
problem.  The discussion will be taken to the list.



-- 
Jonathan D. Rosenberg, Ph.D.                600 Lanidex Plaza
Chief Technology Officer                    Parsippany, NJ 07054-2711
dynamicsoft
jdrosen@dynamicsoft.com                     FAX:   (973) 952-5050
http://www.jdrosen.net                      PHONE: (973) 952-5000
http://www.dynamicsoft.com



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From exim@www1.ietf.org  Thu Dec 18 14:04:31 2003
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From: Jonathan Rosenberg <jdrosen@dynamicsoft.com>
Organization: dynamicsoft
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Subject: [Iptel] Consensus to add trunk group and freephone/np documents as wg items?
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Folks,

As per our discussion during IETF 58, before we could adopt 
draft-yu-tel-url and draft-ietf-iptel-trunk-group as working group 
items, the chairs needed to see sufficient interest and comments on 
the list, in addition to author support, before moving forward. It 
seems there is sufficient interest, and therefore the chairs would 
like to formally add these documents as work items. I believe we have 
consensus for this; please speak up if you disagree.

Thanks,
Jonathan R.
-- 
Jonathan D. Rosenberg, Ph.D.                600 Lanidex Plaza
Chief Technology Officer                    Parsippany, NJ 07054-2711
dynamicsoft
jdrosen@dynamicsoft.com                     FAX:   (973) 952-5050
http://www.jdrosen.net                      PHONE: (973) 952-5000
http://www.dynamicsoft.com



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From exim@www1.ietf.org  Mon Dec 22 15:09:38 2003
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No disagreement; just wanted to check that the same applies to
draft-mahy-iptel-cpc-00.

-- Flemming

Jonathan Rosenberg wrote:

> Folks,
>
> As per our discussion during IETF 58, before we could adopt
> draft-yu-tel-url and draft-ietf-iptel-trunk-group as working group
> items, the chairs needed to see sufficient interest and comments on
> the list, in addition to author support, before moving forward. It
> seems there is sufficient interest, and therefore the chairs would
> like to formally add these documents as work items. I believe we have
> consensus for this; please speak up if you disagree.
>
> Thanks,
> Jonathan R.
> --
> Jonathan D. Rosenberg, Ph.D.                600 Lanidex Plaza
> Chief Technology Officer                    Parsippany, NJ 07054-2711
> dynamicsoft
> jdrosen@dynamicsoft.com                     FAX:   (973) 952-5050
> http://www.jdrosen.net                      PHONE: (973) 952-5000
> http://www.dynamicsoft.com
>
> _______________________________________________
> Iptel mailing list
> Iptel@ietf.org
> https://www.ietf.org/mailman/listinfo/iptel


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