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Re: [rtcweb] Reasons not to multiplex audio with video (Re: Fwd:I-D Action: draft-rosenberg-rtcweb-rtpmux-00.txt)

Matthew Kaufman <matthew.kaufman@skype.net> Mon, 25 July 2011 16:12 UTC

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From: Matthew Kaufman <matthew.kaufman@skype.net>
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Date: Mon, 25 Jul 2011 10:45:55 -0400
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To: Muthu Arul Mozhi Perumal <mperumal@cisco.com>
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Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] Reasons not to multiplex audio with video (Re: Fwd:I-D Action: draft-rosenberg-rtcweb-rtpmux-00.txt)
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On Jul 25, 2011, at 9:35 AM, Muthu Arul Mozhi Perumal (mperumal) wrote:

> c) Using SDP for legacy interop, but extending STUN, by defining a
> (comprehension optional) STUN attribute that indicates it is a
> multiplexed media flow and that the SSRC space has been partitioned to
> enable DPI. Since rtcweb apps are expected to use STUN, it should be
> trivial for them to support this STUN attribute. In addition, the
> software in on-path routers would have to be upgraded anyway to support
> this king of DPI, so they could also be enhanced to detect STUN and look
> for this attribute.

Agree with Harald that this is a layering violation, but I would not be averse to putting a hint in STUN for this, or indeed a hint in STUN (as a non-mandatory attribute) saying that we're doing other RTCWEB things, for devices that can only see the RTP/RTCP/STUN packets.

That'd get yet another WG into the mix, of course.

Matthew Kaufman

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