From gautyada@gmail.com Wed Sep 7 02:11:23 2011 Return-Path: X-Original-To: iptel@ietfa.amsl.com Delivered-To: iptel@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B6FAC21F84E5 for ; Wed, 7 Sep 2011 02:11:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.998 X-Spam-Level: X-Spam-Status: No, score=-2.998 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_63=0.6, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oUXUBLvrzO4k for ; Wed, 7 Sep 2011 02:11:18 -0700 (PDT) Received: from mail-gw0-f42.google.com (mail-gw0-f42.google.com [74.125.83.42]) by ietfa.amsl.com (Postfix) with ESMTP id A70FE21F84D8 for ; Wed, 7 Sep 2011 02:11:17 -0700 (PDT) Received: by gwb17 with SMTP id 17so4070000gwb.15 for ; Wed, 07 Sep 2011 02:13:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=2+O09LRD8G+rH7zChk3s1/+utr4zKRXSnAoo9izZFkc=; b=KZdjgkreaxGcE51AeYzWn4lJ0lOpPe6b7SRUPQGBbBLQaX8NBR/4t9yHhbhhHx2MaZ Eeo1ifRCF8ffdH1z20gDmd2BwqMmqr/adAb9gZCq2HYiTiJppuOEb+s7rXpgMks/usrl YLPJkr5qxe1CyXNibXSiHwGwovqYG2rD42ftI= MIME-Version: 1.0 Received: by 10.68.7.10 with SMTP id f10mr9583948pba.76.1315386786046; Wed, 07 Sep 2011 02:13:06 -0700 (PDT) Received: by 10.142.252.20 with HTTP; Wed, 7 Sep 2011 02:13:05 -0700 (PDT) In-Reply-To: <4E3FE736.3000004@bell-labs.com> References: <4E244A60.6020508@bell-labs.com> <4E3FE736.3000004@bell-labs.com> Date: Wed, 7 Sep 2011 14:43:05 +0530 Message-ID: From: Gautam Yadav To: "Vijay K. Gurbani" Content-Type: multipart/mixed; boundary=bcaec5215b5d1fe18204ac565a3c Cc: fluffy@cisco.com, iptel@ietf.org Subject: Re: [Iptel] How To Give Suggestions X-BeenThere: iptel@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: IP Telephony List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Sep 2011 09:11:23 -0000 --bcaec5215b5d1fe18204ac565a3c Content-Type: multipart/alternative; boundary=bcaec5215b5d1fe17e04ac565a3a --bcaec5215b5d1fe17e04ac565a3a Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Vijay, thanks for your response. Please allow me to try one more time to explain m= y point with help of an example. I have attached a call flow for your reference. "A" party is the subscriber of Switch-1 and has taken a service called "Caller Identity Delivery Supression" (CIDS). "B" party is the subscriber o= f Switch-2. Switch-1 and Switch-2 are connected through SIP trunk. Also we need to transport the trunk group parameters in the contact header of the INVITE message when A places the call to B. This is how the INVITE from Switch-1 to Switch-2 looks like: INVITE sip:5746064748@192.168.10.10:5060;user=3Dphone SIP/2.0 Via: SIP/2.0/UDP 192.168.10.20:5060;branch=3Dz9hG4bK_1103250270916482186 From: "Anonymous";tag=3D1_1103_f25027_yt52_CtkM381990 To: Call-ID: 0793308353@192.168.10.20 CSeq: 1 INVITE Max-Forwards: 70 Supported: 100rel,timer,replaces,unknown *Contact: * Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,REGISTER,INFO,PRACK,SUBSCRIBE,NOTIFY,REFER,UP= DATE Min-SE: 900 Session-Expires: 1800;refresher=3Duac Privacy: id Content-Length: 246 Content-Type: application/sdp The Switch-1 has constructed this INVITE message by refering to RFC 4904 fo= r encoding trunk group parameters and RFC 3323 for hiding the A party's (Caller's) identity and ecnoded the "Anonymous" in the contact header. Now, on receiving this INVITE the Switch-2 is rejecting the call because it is saying that it expects a tel URI in the contact header if it contains th= e tgrp parameters as mentioned in RFC 4904. Switch-2 guys are also saying tha= t any locally generated number at Switch-1 can be placed in contact header if the Caller's identity is to be hidden so that they can convert It into a te= l uri. Now the problem is that both the switches are from different vendors and they have there respective arguments. Switch-1 guys are saying since RFC 3323 says that you can use "Anonymous" in case caller id is to be hidden which makes it a SIP uri and Switch-2 guys are saying that since tgrp parameters are present in contact header they expect a tel uri in it. Switch-2 guys are basing there argument on the fact that RFC 4904 says that tgrp parameters must be in tel uri. RFC 4904 tallks about tel uri because it talks about the SS7 trunks. But I am talking about SIP trunks in my case. That's why I had said that is it possible to include SIP trunks in rfc 4904 and allow the use of SIP uri along with tgrp parameters. Thanks, Gautam On Mon, Aug 8, 2011 at 7:10 PM, Vijay K. Gurbani wrote: > Please see inline. > > > On 08/08/2011 07:26 AM, Gautam Yadav wrote: > >> Hi Vijay, Cullen, >> >> Sorry for the delayed response as I was busy with some other activities. >> My suggestion is with regards to the rfc 4904 and it comes from on of >> the inter-operational that I faced. I am starting by quoting the aim of >> the rfc 4904 to begin with followed by problem statement and suggestion. >> From Section 2: >> >> The aim of this specification is to outline how to structure and >> >> represent the trunk group parameters as an extension to the tel URI >> >> [4] in a standardized manner. >> >> My Understanding: I believe the rfc 4904 talks about the extension to >> the tel URI only because it specifically talks about the >> inter-operational issues for the scenarios where SIP to SS7 gateways >> come into picture. >> >> Problem Statement: We have the call scenario of MGCP to MGCP call where >> A and B parties are on different soft-switches. Topology: A =E0Switch-1 >> --- SIP Trunk --=E0Switch-2 --=E0B. We need to transport the trunk group >> >> parameters in the Contact Header and called ID needs to be hidden >> because of the privacy concerns. Our contact header looks like: Contact: >> SIP:Anonymous;tgrp=3D1000;trunk-**context=3Dcontext-1@192.168.10.**20 >> >. >> We are >> >> facing an inter-operational issue because of this contact header. >> Switch-1 is referring to the rfc 3323 and encoding =93Anonymous=94 but t= he >> switch-2 is referring the rfc 4904 and expects tel URI and =93557=94 in = its >> user part. >> > > As far as I can tell, you appear to be having the problem because > Switch-1 is encoding an anonymous identifier whereas Switch-2 is > expecting an identity of some sort (probably a telephone extension) > in the Contact header. > > > My Suggestion/Query: Is it possible to increase the scope of the rfc >> 4904 and consider the SIP trunks also and not just the SS7 trunks and by >> implication allow the SIP URI also and not just tel URI. >> > > I can't see how increasing the scope of rfc4904 will help you here. > You need to impart the identity to Switch-2 by some means, if that is > what it wants. Doing so will be outside the scope of rfc4904. > > That said, there are ways around this but at the philosophical level, > if the sender has decided to stay anonymous and you can still correlate > that sender to a specific identity, then the assumed anonymity of the > system is not of much help. > > You could be wanting to anonymise the caller ID during transit only, and > not to provide a complete anonymity service. If that is the case, then > you could correlate the identity at Switch-2, but again, doing so is > outside the scope of rfc4904 as far as I can see it. > > Thanks, > > > - vijay > -- > Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent > 1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA) > Email: vkg@{bell-labs.com,acm.org} / vijay.gurbani@alcatel-lucent.**com > Web: http://ect.bell-labs.com/who/**vkg/ > --bcaec5215b5d1fe17e04ac565a3a Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
Hi Vijay,
=A0
thanks for your response. Please allow me to try one more time to expl= ain my point with help of an example. I have attached a call flow for your = reference.
=A0
"A" party is the subscriber of Switch-1 and has taken a serv= ice called "Caller Identity Delivery Supression" (CIDS). "B&= quot; party is the subscriber of Switch-2. Switch-1 and Switch-2 are connec= ted through SIP trunk. Also we need to transport the trunk group parameters= in the contact header of the INVITE message when A places the call to B. T= his is how the INVITE from Switch-1 to Switch-2 looks like:
=A0

INVITE sip:5746064748@192.168.10.10:5060;user=3Dphone SIP/2.0

Via: SIP/2.0/UDP=A0 192.168.10.20:5060;branch=3Dz9= hG4bK_1103250270916482186

From: "Anonymous"<sip:Anonymous@Anonymous.invalid&= gt;;tag=3D1_1103_f25027_yt52_CtkM381990

To: <sip:5746064748@domain-1.com;user=3Dphone>

Call-ID: 0793308353@192.168.10.20

CSeq: 1=A0=A0=A0=A0=A0=A0 INVITE

Max-Forwards: 70

Supported: 100rel,timer,replaces,unknown

Contact: <sip:Anonymous;tgrp=3D1000;trunk- context= =3Dcontext-1;transport=3Dudp>

Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,REGISTER,INFO,PRACK,SUBSCR= IBE,NOTIFY,REFER,UPDATE

Min-SE: 900

Session-Expires: 1800;refresher=3Duac

Privacy: id

Content-Length:=A0=A0=A0 246

Content-Type: application/sdp


The Switch-1 has constructed this INVITE message by refering to RF= C 4904 for encoding trunk group parameters and RFC 3323=A0for hiding the=A0= A party's=A0(Caller's) identity and ecnoded the "Anonymous&quo= t; in the contact header.
=A0
Now, on receiving this INVITE the Switch-2 is rejecting the call=A0bec= ause it is saying that it expects a tel URI in the contact header if it con= tains the tgrp parameters as mentioned in RFC 4904.=A0Switch-2 guys are als= o saying=A0that any locally generated number at=A0Switch-1 can be placed in= contact header if the Caller's identity is to be hidden so that they c= an convert=A0It=A0into a tel uri.
=A0
Now the problem is that both the switches are from different vendors a= nd they have=A0there respective arguments. Switch-1 guys are saying since R= FC 3323=A0says that you can use "Anonymous" in case caller id is = to be hidden which makes it a SIP uri and Switch-2 guys are saying that sin= ce tgrp parameters are present in contact header they expect a tel uri in i= t. Switch-2 guys are basing there argument on the fact that RFC 4904 says t= hat=A0tgrp parameters=A0must be in tel uri.=A0RFC 4904 tallks about tel uri= because it talks about the SS7 trunks.=A0But I am talking about SIP trunks= in my case. That's why I had said that is it possible to include SIP t= runks in rfc 4904 and allow the use of=A0SIP uri along with tgrp parameters= .
=A0
Thanks,
Gautam
=A0

=A0
On Mon, Aug 8, 2011 at 7:10 PM, Vijay K. Gurbani= <vkg@bell-labs.com> wrote:
Please see inline.=20


On 08/08/2011 07:26 AM, Gautam Yadav wrote:
Hi Vijay, Cullen,=20

Sorry for the delayed response as I was busy with some other activ= ities.
My suggestion is with regards to the rfc 4904 and it comes from o= n of
the inter-operational that I faced. I am starting by quoting the ai= m of
the rfc 4904 to begin with followed by problem statement and suggestion.=A0From Section 2:

The aim of this specification is to outline how = to structure and

represent the trunk group parameters as an extensio= n to the tel URI

[4] in a standardized manner.

My Understanding: I believe the rf= c 4904 talks about the extension to
the tel URI only because it specific= ally talks about the
inter-operational issues for the scenarios where SI= P to SS7 gateways
come into picture.

Problem Statement: We have the call scenario of M= GCP to MGCP call where
A and B parties are on different soft-switches. T= opology: A =E0Switch-1
--- SIP Trunk --=E0Switch-2 --=E0B. We need= to transport the trunk group=20

parameters in the Contact Header and called ID needs to be hidden<= br>because of the privacy concerns. Our contact header looks like: Contact:=
SIP:Anonymous;tgrp=3D1000;trunk-context=3Dcontext-1@192.168.10.20
<sip:Anonymous;tgrp=3D1000;trunk-context=3Dcontext-1@192.168.10.20= >. We are=20

facing an inter-operational issue because of this contact header.<= br>Switch-1 is referring to the rfc 3323 and encoding =93Anonymous=94 but t= he
switch-2 is referring the rfc 4904 and expects tel URI and =93557=94 = in its
user part.

As far as I can tell, you appear to be= having the problem because
Switch-1 is encoding an anonymous identifier= whereas Switch-2 is
expecting an identity of some sort (probably a tele= phone extension)
in the Contact header.=20


My Suggestion/Query: Is it possi= ble to increase the scope of the rfc
4904 and consider the SIP trunks al= so and not just the SS7 trunks and by
implication allow the SIP URI also and not just tel URI.
I can't see how increasing the scope of rfc4904 will help you h= ere.
You need to impart the identity to Switch-2 by some means, if that = is
what it wants. =A0Doing so will be outside the scope of rfc4904.

Tha= t said, there are ways around this but at the philosophical level,
if th= e sender has decided to stay anonymous and you can still correlate
that = sender to a specific identity, then the assumed anonymity of the
system is not of much help.

You could be wanting to anonymise the ca= ller ID during transit only, and
not to provide a complete anonymity ser= vice. =A0If that is the case, then
you could correlate the identity at S= witch-2, but again, doing so is
outside the scope of rfc4904 as far as I can see it.

Thanks,=20


- vijay
--
Vijay K. Gurbani, Bell Laboratories, Alcatel= -Lucent
1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)Email: vkg@{bell-labs= .com,acm.org} / vijay.gurb= ani@alcatel-lucent.com
Web: =A0 ht= tp://ect.bell-labs.com/who/vkg/

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