Re: [MMUSIC] BUNDLE Weekly Summary: Assumptions

"Cullen Jennings (fluffy)" <fluffy@cisco.com> Fri, 10 May 2013 22:35 UTC

Return-Path: <fluffy@cisco.com>
X-Original-To: mmusic@ietfa.amsl.com
Delivered-To: mmusic@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8C30C21F9410 for <mmusic@ietfa.amsl.com>; Fri, 10 May 2013 15:35:02 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -110.599
X-Spam-Level:
X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100]
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 99DvlcCrpjYN for <mmusic@ietfa.amsl.com>; Fri, 10 May 2013 15:34:57 -0700 (PDT)
Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id CDC6221F940D for <mmusic@ietf.org>; Fri, 10 May 2013 15:34:56 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1244; q=dns/txt; s=iport; t=1368225296; x=1369434896; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=C+xkaXQ8RRQHXfckSXuw7UkFbbDLA7nw7RphxGJGJe8=; b=TjdjHw361wZ599PSkT5AN4dThtYvrPVPhpUY7RIkKV3vrL8Jib9bY4tX oDo9HlGsPZe8IV3y3bWcYtanRE7gY18DS6Rx+omDxhJCu22FfbwzwkFwi SOGvK/Rd/hBOlKuCuOr9azfYDhUv5iKWrq2vJNvKuterYh77YFsqUgzgf M=;
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: AgEFAAF1jVGtJV2b/2dsb2JhbABSgwfAV3sWdIIfAQEBAwF5BQsCAQgOCgokIRElAgQOBQiHcgMJBrUTDYgojFKCIwIxB4J0YQOVSI13hSKDD4In
X-IronPort-AV: E=Sophos;i="4.87,651,1363132800"; d="scan'208";a="208821005"
Received: from rcdn-core-4.cisco.com ([173.37.93.155]) by rcdn-iport-1.cisco.com with ESMTP; 10 May 2013 22:34:55 +0000
Received: from xhc-aln-x03.cisco.com (xhc-aln-x03.cisco.com [173.36.12.77]) by rcdn-core-4.cisco.com (8.14.5/8.14.5) with ESMTP id r4AMYtZo020354 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 10 May 2013 22:34:55 GMT
Received: from xmb-aln-x02.cisco.com ([169.254.5.192]) by xhc-aln-x03.cisco.com ([173.36.12.77]) with mapi id 14.02.0318.004; Fri, 10 May 2013 17:34:55 -0500
From: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
To: Eric Rescorla <ekr@rtfm.com>
Thread-Topic: [MMUSIC] BUNDLE Weekly Summary: Assumptions
Thread-Index: AQHOTcqqHcswwrWHOk25MsldfS1yY5j/UGeAgAAARACAAAGrAIAAALoAgAACaIA=
Date: Fri, 10 May 2013 22:34:55 +0000
Message-ID: <C5E08FE080ACFD4DAE31E4BDBF944EB1134DF558@xmb-aln-x02.cisco.com>
References: <7594FB04B1934943A5C02806D1A2204B1C36B485@ESESSMB209.ericsson.se> <C5E08FE080ACFD4DAE31E4BDBF944EB1134DEF4B@xmb-aln-x02.cisco.com> <CABcZeBMrgaHGXFi_NRk+znsT-AGnRS5EDLgFhZgGA+VG81BhZw@mail.gmail.com> <CABkgnnW=4zNgauXc-=pv9j9zGdVntmb=K22wcRr77wfQc-6J3w@mail.gmail.com> <CABcZeBODcyo-JXqs6EZ-F5BY_TaM94+eu+UqNApFnTNjpehUzA@mail.gmail.com> <CABkgnnVd7LuH81gO_U9scY5sf_7zOZozyMhuxn-xiPHgMn_hFQ@mail.gmail.com> <CABcZeBOaNi5MQ2KTUua_HeeYgcXWBQbVwbayy8v68uKi9TdDEg@mail.gmail.com>
In-Reply-To: <CABcZeBOaNi5MQ2KTUua_HeeYgcXWBQbVwbayy8v68uKi9TdDEg@mail.gmail.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [10.20.249.164]
Content-Type: text/plain; charset="Windows-1252"
Content-ID: <DE79B8A80F7FF248BAB49FDEC6A1CCDE@emea.cisco.com>
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Cc: "Cullen Jennings \(fluffy\)" <fluffy@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [MMUSIC] BUNDLE Weekly Summary: Assumptions
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Multiparty Multimedia Session Control Working Group <mmusic.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mmusic>, <mailto:mmusic-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/mmusic>
List-Post: <mailto:mmusic@ietf.org>
List-Help: <mailto:mmusic-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mmusic>, <mailto:mmusic-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 10 May 2013 22:35:02 -0000

On May 10, 2013, at 4:26 PM, Eric Rescorla <ekr@rtfm.com> wrote:

> On Fri, May 10, 2013 at 3:23 PM, Martin Thomson <martin.thomson@gmail.com> wrote:
> On 10 May 2013 15:17, Eric Rescorla <ekr@rtfm.com> wrote:
> > On Fri, May 10, 2013 at 3:16 PM, Martin Thomson <martin.thomson@gmail.com>
> > wrote:
> >>
> >> On 10 May 2013 15:05, Eric Rescorla <ekr@rtfm.com> wrote:
> >> > I'm sorry to be slow today, but can you point me to the specific MUST
> >> > NOT in
> >> > RFC 5888.
> >>
> >> I struggled to find it too.  It's in 9.2:
> >>
> >>    SIP entities refuse media streams by setting the port to zero in the
> >>    corresponding "m" line. "a=group" lines MUST NOT contain
> >>    identification-tags that correspond to "m" lines with the port set to
> >>    zero.
> >
> > This feels like something we could relax for the offer.
> 
> Absolutely.  It seems a little arbitrary.  That said, I'd like to
> understand why the MUST NOT exists.  Of the groupings I understand, I
> can't think of a reason not to allow negotiated-off lines, but I'm
> prepared to be surprised.
> 
> Indeed. 
> 
> Of course, if it is a problem we can invent:
> a=group-without-5888-restrictions:….

+1