[Sip] My two cents on the INFO question
Jonathan Rosenberg <jdrosen@cisco.com> Mon, 03 December 2007 08:02 UTC
Return-path: <sip-bounces@ietf.org>
Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1Iz6GJ-0003gb-OI; Mon, 03 Dec 2007 03:02:43 -0500
Received: from sip by megatron.ietf.org with local (Exim 4.43) id 1Iz6GH-0003dq-W2 for sip-confirm+ok@megatron.ietf.org; Mon, 03 Dec 2007 03:02:42 -0500
Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1Iz6GA-0003b0-GK for sip@ietf.org; Mon, 03 Dec 2007 03:02:34 -0500
Received: from sj-iport-6.cisco.com ([171.71.176.117]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1Iz6G9-000522-Ub for sip@ietf.org; Mon, 03 Dec 2007 03:02:34 -0500
Received: from sj-dkim-1.cisco.com ([171.71.179.21]) by sj-iport-6.cisco.com with ESMTP; 03 Dec 2007 00:02:33 -0800
Received: from sj-core-5.cisco.com (sj-core-5.cisco.com [171.71.177.238]) by sj-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id lB382X4I006885 for <sip@ietf.org>; Mon, 3 Dec 2007 00:02:33 -0800
Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-5.cisco.com (8.12.10/8.12.6) with ESMTP id lB382N1h023266 for <sip@ietf.org>; Mon, 3 Dec 2007 08:02:33 GMT
Received: from xfe-sjc-211.amer.cisco.com ([171.70.151.174]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 3 Dec 2007 00:02:27 -0800
Received: from [10.21.87.30] ([10.21.87.30]) by xfe-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 3 Dec 2007 00:02:27 -0800
Message-ID: <47537F44.8080700@cisco.com>
Date: Sun, 02 Dec 2007 23:00:04 -0500
From: Jonathan Rosenberg <jdrosen@cisco.com>
User-Agent: Thunderbird 2.0.0.9 (Windows/20071031)
MIME-Version: 1.0
To: IETF SIP List <sip@ietf.org>
Content-Type: text/plain; charset="ISO-8859-1"; format="flowed"
Content-Transfer-Encoding: 7bit
X-OriginalArrivalTime: 03 Dec 2007 08:02:27.0173 (UTC) FILETIME=[D8581150:01C83582]
DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=2729; t=1196668953; x=1197532953; c=relaxed/simple; s=sjdkim1004; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=jdrosen@cisco.com; z=From:=20Jonathan=20Rosenberg=20<jdrosen@cisco.com> |Subject:=20My=20two=20cents=20on=20the=20INFO=20question |Sender:=20; bh=gQBJm7B/oMMl3mmzYPXNCpvJNjUb2trHBeeEreW3q6U=; b=sMGKY30SlNcvTvIO0wbFwlunltLW7d+1PnHCWqLZEvzjWh9ToJipobf+xdJSZ22NljBdDI++ sOcUoNyzknvCAUWyHWHXoPMPZUnJEOjxpxJqRe1NDy4pxTXsM+YPdpuZR+pttfS4g0mMDBdEJf pusJwYQ4oXfjZXrHfsKWm1o3c=;
Authentication-Results: sj-dkim-1; header.From=jdrosen@cisco.com; dkim=pass ( sig from cisco.com/sjdkim1004 verified; );
X-Spam-Score: 1.4 (+)
X-Scan-Signature: 5a9a1bd6c2d06a21d748b7d0070ddcb8
Subject: [Sip] My two cents on the INFO question
X-BeenThere: sip@ietf.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Session Initiation Protocol <sip.ietf.org>
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/sip>, <mailto:sip-request@ietf.org?subject=unsubscribe>
List-Post: <mailto:sip@ietf.org>
List-Help: <mailto:sip-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/sip>, <mailto:sip-request@ietf.org?subject=subscribe>
Errors-To: sip-bounces@ietf.org
Well, I finally had a chance to catch up on this topic - reading both Eric's and Hadriel's drafts and most (though not all) of the enormous number of messages on this topic. I personally do not think there is a good definition yet of what the problem is that we are trying to solve. There has been lots of general discussion about INFO usages but for the most part, DTMF is the only real concrete one that has come to the table. My big worry is that the DTMF "problem" is in fact much bigger than just adding negotiation to INFO. Indeed, in a very real sense, defining a new INFO package and INFO framework will just add yet ANOTHER mechanism to the list of things standardized for DTMF (2833, KPML, existing non-standard INFO, unsolicited NOTIFY, and now INFO package). The real problem IMHO is that we lack clear guidance on when each of these applies and when it doesn't. We have no baseline standard that everyone has to implement, and we have no framework for negotiating amongst these very different things. I simply do not see how defining an INFO framework solves that problem. What are the actual use cases where DTMF-over-INFO is the 'right' thing? The only one I've seen mentioned was the 323 gateway case. Are there others? Is that the only use case that this whole mess would actually address? Another big worry is that, if we did have this INFO framework, we would be adding another mechanism to an already-long list of ways to handle UA to UA signaling. Is it clear what the different areas of applicability are for rfc3265 vs. setting up a separate control session vs. new methods vs. UPDATE w/ headers vs. the new INFO framework? I don't think is clear at all. To give an example, Hadriel raised a potential new usage of the INFO framework for exchanging pictures or vcard in the middle of the call. However, we already have a mechanism for doing that via Call-Info. Indeed, Call-Info has the benefit of having a "purpose" attribute, which defines the context for the URL being exchange. So, would the right way to exchange vcards to send an UPDATE with Call-Info? Or send INFO with Info-Event: vcard along with the vcard content in the body? I'm not opposed to a new info framework in principle, but I think its not at all clear that, if we defined such a framework, we'd be solving any real interoperability problems. My 2 cents, Jonathan R. -- Jonathan D. Rosenberg, Ph.D. 499 Thornall St. Cisco Fellow Edison, NJ 08837 Cisco, Voice Technology Group jdrosen@cisco.com http://www.jdrosen.net PHONE: (408) 902-3084 http://www.cisco.com _______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use sip-implementors@cs.columbia.edu for questions on current sip Use sipping@ietf.org for new developments on the application of sip
- [Sip] My two cents on the INFO question Jonathan Rosenberg
- VS: [Sip] My two cents on the INFO question Christer Holmberg
- RE: [Sip] My two cents on the INFO question Hadriel Kaplan