[MMUSIC] HELP: multiple unicast addresses for layered encoding in SDP ???
Paul Kyzivat <pkyzivat@alum.mit.edu> Wed, 05 June 2019 17:59 UTC
Return-Path: <pkyzivat@alum.mit.edu>
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 EAA1F1201D6 for <mmusic@ietfa.amsl.com>; Wed, 5 Jun 2019 10:59:50 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.2
X-Spam-Level:
X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vLZxAevIPYxy for <mmusic@ietfa.amsl.com>; Wed, 5 Jun 2019 10:59:48 -0700 (PDT)
Received: from outgoing-alum.mit.edu (outgoing-alum.mit.edu [18.7.68.33]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8A618120043 for <mmusic@ietf.org>; Wed, 5 Jun 2019 10:59:48 -0700 (PDT)
Received: from PaulKyzivatsMBP.localdomain (c-24-62-227-142.hsd1.ma.comcast.net [24.62.227.142]) (authenticated bits=0) (User authenticated as pkyzivat@ALUM.MIT.EDU) by outgoing-alum.mit.edu (8.14.7/8.12.4) with ESMTP id x55HxkxN032338 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT) for <mmusic@ietf.org>; Wed, 5 Jun 2019 13:59:46 -0400
To: IETF MMUSIC WG <mmusic@ietf.org>
From: Paul Kyzivat <pkyzivat@alum.mit.edu>
Message-ID: <836be93f-726d-d22e-4d37-7934fead9cd7@alum.mit.edu>
Date: Wed, 05 Jun 2019 13:59:45 -0400
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:60.0) Gecko/20100101 Thunderbird/60.7.0
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"; format="flowed"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/xAKjQ5EHrrOnC0kq95lgF4KY6GE>
Subject: [MMUSIC] HELP: multiple unicast addresses for layered encoding in SDP ???
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.29
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: <https://mailarchive.ietf.org/arch/browse/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: Wed, 05 Jun 2019 17:59:51 -0000
While working on rfc4566bis I discovered something I didn't know was
there, and question:
Multiple addresses or "c=" lines MAY be specified on a per media
description basis only if they provide multicast addresses for
different layers in a hierarchical or layered encoding scheme.
Multiple addresses or "c=" lines MUST NOT be specified at session
level.
The slash notation for multiple addresses described above MUST NOT be
used for IP unicast addresses.
The syntax doesn't allow the slash format for unicast addresses. But I
didn't realize that multiple c= lines also aren't allowed. I could swear
there have been discussions of using this.
Am I just confused? Are multiple unicast c= lines in use in the wild for
layered encoding?
Thanks,
Paul
- [MMUSIC] HELP: multiple unicast addresses for lay… Paul Kyzivat
- Re: [MMUSIC] HELP: multiple unicast addresses for… Bernard Aboba
- Re: [MMUSIC] HELP: multiple unicast addresses for… Ali C. Begen