Re: [sipcore] About SUBSCRIBE method's performance and Out-of-Dialog notification suggestion:

"Worley, Dale R (Dale)" <dworley@avaya.com> Tue, 04 January 2011 17:13 UTC

Return-Path: <dworley@avaya.com>
X-Original-To: sipcore@core3.amsl.com
Delivered-To: sipcore@core3.amsl.com
Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 8E5A43A6C0B for <sipcore@core3.amsl.com>; Tue, 4 Jan 2011 09:13:40 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -102.508
X-Spam-Level:
X-Spam-Status: No, score=-102.508 tagged_above=-999 required=5 tests=[AWL=0.091, BAYES_00=-2.599, USER_IN_WHITELIST=-100]
Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9tsDNhABsYtC for <sipcore@core3.amsl.com>; Tue, 4 Jan 2011 09:13:39 -0800 (PST)
Received: from co300216-co-outbound.net.avaya.com (co300216-co-outbound.net.avaya.com [198.152.13.100]) by core3.amsl.com (Postfix) with ESMTP id C56BA3A6BE0 for <sipcore@ietf.org>; Tue, 4 Jan 2011 09:13:39 -0800 (PST)
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: AvsEACbkIk3GmAcF/2dsb2JhbACkPHOlaAKWY4VKBIRoiVY
X-IronPort-AV: E=Sophos;i="4.60,273,1291611600"; d="scan'208";a="257976768"
Received: from unknown (HELO co300216-co-erhwest.avaya.com) ([198.152.7.5]) by co300216-co-outbound.net.avaya.com with ESMTP; 04 Jan 2011 12:15:45 -0500
X-IronPort-AV: E=Sophos;i="4.60,273,1291611600"; d="scan'208";a="566164953"
Received: from unknown (HELO DC-US1HCEX3.global.avaya.com) ([135.11.52.22]) by co300216-co-erhwest-out.avaya.com with ESMTP; 04 Jan 2011 12:15:45 -0500
Received: from DC-US1MBEX4.global.avaya.com ([169.254.1.90]) by DC-US1HCEX3.global.avaya.com ([135.11.52.22]) with mapi; Tue, 4 Jan 2011 12:15:45 -0500
From: "Worley, Dale R (Dale)" <dworley@avaya.com>
To: "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>, "gao.yang2@zte.com.cn" <gao.yang2@zte.com.cn>, "sipcore@ietf.org" <sipcore@ietf.org>
Date: Tue, 4 Jan 2011 12:13:16 -0500
Thread-Topic: [sipcore] About SUBSCRIBE method's performance and Out-of-Dialog notification suggestion:
Thread-Index: Acurz5QtWQHzD79cTT6fQ2ai1bdXOAAU1tdQAAGg3MAAAk6IgQ==
Message-ID: <CD5674C3CD99574EBA7432465FC13C1B2202288B42@DC-US1MBEX4.global.avaya.com>
References: <OFFE9A94AD.A56650E3-ON4825780E.0019F49D-4825780E.001DA589@zte.com.cn> <CD5674C3CD99574EBA7432465FC13C1B2202288B40@DC-US1MBEX4.global.avaya.com>, <EDC0A1AE77C57744B664A310A0B23AE21E5898DE@FRMRSSXCHMBSC3.dc-m.alcatel-lucent.com>
In-Reply-To: <EDC0A1AE77C57744B664A310A0B23AE21E5898DE@FRMRSSXCHMBSC3.dc-m.alcatel-lucent.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Subject: Re: [sipcore] About SUBSCRIBE method's performance and Out-of-Dialog notification suggestion:
X-BeenThere: sipcore@ietf.org
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: SIP Core Working Group <sipcore.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/listinfo/sipcore>, <mailto:sipcore-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/sipcore>
List-Post: <mailto:sipcore@ietf.org>
List-Help: <mailto:sipcore-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/sipcore>, <mailto:sipcore-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 04 Jan 2011 17:13:40 -0000

________________________________________
From: DRAGE, Keith (Keith) [keith.drage@alcatel-lucent.com]

The key here is to understanding what dialog state needs to be maintained, and the proposal as currently described does not seem to change that.
________________________________________

I suspect that the question is dialog state maintained in intermediate elements, as many SIP systems coming from traditional telco companies implement intermediate elements as B2BUAs, and often have up to a dozen B2BUAs in what would be expected in SIP to be a single dialog.  I expect Gao will clarify the question when his day arrives.

Dale