Re: [MMUSIC] "a=extmap" with BUNDLE

Iñaki Baz Castillo <ibc@aliax.net> Sun, 26 March 2017 01:36 UTC

Return-Path: <ibc@aliax.net>
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 A3C031293DB for <mmusic@ietfa.amsl.com>; Sat, 25 Mar 2017 18:36:18 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level:
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=aliax-net.20150623.gappssmtp.com
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 5v7y9aqZMT2k for <mmusic@ietfa.amsl.com>; Sat, 25 Mar 2017 18:36:16 -0700 (PDT)
Received: from mail-wr0-x236.google.com (mail-wr0-x236.google.com [IPv6:2a00:1450:400c:c0c::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9A5BB126C83 for <mmusic@ietf.org>; Sat, 25 Mar 2017 18:36:16 -0700 (PDT)
Received: by mail-wr0-x236.google.com with SMTP id u1so13979028wra.2 for <mmusic@ietf.org>; Sat, 25 Mar 2017 18:36:16 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aliax-net.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=17Jy7D6rI8zknVx2p+9aJZ4FGtvzwB6qIG8sdTZqLRE=; b=yEXFYfLz+3wxUKLL+2/sbQrvjsq3Gs8qgm7HYpiOd+ANtWHkwvXW5zgftcgwslwNR5 WanfUDB4Zbc05y+PPUWmqRxp7QqYENM4xAcIeebEgHqBWOg3YAuAPplmcYgmWZ2uUwYH OgqYAKPemaYnLwCDki2lMTMSJCljkDGzoEk28/0PGwQw8GqyeJrrvaqEcfDGzknv+VZ6 cN40uKTylWHWFZL/O+h8ZRGvK4bWuR8tjhXjBpCxo14p5Zah3WyJO0AmNG513VRob6b4 0FttGLknk8BMNFZ4q6nMgukGu1i2NxfriyiVWgEgJ2rEPsCMjApladNNo9LFsscJY+eU mE7A==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=17Jy7D6rI8zknVx2p+9aJZ4FGtvzwB6qIG8sdTZqLRE=; b=stpig9Zo0jKKspC1LXFWDqaQlAoHywvwJ9n66iw1+sf8g0bMk5Vn+PI14ZUqiyIA4N 3dklCiOmm8h36KT3+TRW/bP2B/7MGITUVZHQEYVQt39tKIOQQpnHVG8aWRJKjsjGwgI7 Z3NrojQcCHx86Vt4uLJlQpgT66MtngbUDFWnCO/LlcBHgSe+0zOyobsXy9xaDATmifik oUrIBMXu0ohSZt8YxPgLS1xmCfGbvg1X1W5Uky+Qcoegc3FFVIhZo3BZb4A86V0tXWKQ oesk5tgl2ph2/xIBVj9ssWm1b0PkS9m3Zc953q+5P+qBS0Q6C2NUKiDNaPlAYOZt1j0Y Fz2A==
X-Gm-Message-State: AFeK/H0BT0/CFWmK0n8SxObjCcqMNGKlayVOCZVBgov8XLsFqijnvUQGdP1eZfV3QhLZwmb5W1smXIBj3ZQwvQ==
X-Received: by 10.223.135.252 with SMTP id c57mr14146930wrc.109.1490492175172; Sat, 25 Mar 2017 18:36:15 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.80.138.222 with HTTP; Sat, 25 Mar 2017 18:35:54 -0700 (PDT)
In-Reply-To: <CAK35n0ZMX6XVicnuvxHH16ADW5on0n18yK8_VDTLX7B1Gb0XDA@mail.gmail.com>
References: <CAK35n0YEA8Cu_v33QsTHXRx70Jw6r-gYT_4rSjYvb6KR+YD81Q@mail.gmail.com> <CAMRcRGTJoOE0HLGwkdW261SiM+J3BCoAiDeq919d+YkyfhU6eg@mail.gmail.com> <CAK35n0ZMX6XVicnuvxHH16ADW5on0n18yK8_VDTLX7B1Gb0XDA@mail.gmail.com>
From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Sun, 26 Mar 2017 03:35:54 +0200
Message-ID: <CALiegfmDH4a8nM08ify77pcz+az38KbJ3=x1n-dso7SYoODD1A@mail.gmail.com>
To: Taylor Brandstetter <deadbeef@google.com>
Cc: Suhas Nandakumar <suhasietf@gmail.com>, mmusic WG <mmusic@ietf.org>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/fikCRuK-cUq2aKrdwT-RugBT-NI>
Subject: Re: [MMUSIC] "a=extmap" with BUNDLE
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.22
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: Sun, 26 Mar 2017 01:36:19 -0000

2017-03-24 19:28 GMT+01:00 Taylor Brandstetter <deadbeef@google.com>om>:
> saw that. Which means that individual documents are responsible for defining
> how their extensions work with BUNDLE.
>
> But something still would need to define the general restrictions for using
> "extmap" with BUNDLE, such as the ID restriction. Or is that just something
> that's common sense and doesn't need to be specified?

https://tools.ietf.org/html/rfc5285#section-6 just mandates that the
IDs must be unique within a m= section, but at the end, all the WebRC
implementations use unique ID values across the entire SDP.

There are some RTP extensions, such as
http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01,
that work at *transport* level (rather than at m= section level), but
nothing prevents such a spec to work even if its ID is not unique
within the m= sections.

This is, IMHO we don't need a global behavior/requirement for the ID
values within bundled m= sections.


-- 
Iñaki Baz Castillo
<ibc@aliax.net>