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Re: [MMUSIC] BUNDLE: mandate RTP/RTCP multiplexing?

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 03 May 2013 06:22 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Bernard Aboba <bernard_aboba@hotmail.com>, "Dale R. Worley" <worley@ariadne.com>
Thread-Topic: [MMUSIC] BUNDLE: mandate RTP/RTCP multiplexing?
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Date: Fri, 03 May 2013 06:22:21 +0000
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Subject: Re: [MMUSIC] BUNDLE: mandate RTP/RTCP multiplexing?
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Hi Bernard,

I am not suggesting a deviation from RFC 5761.

As the text says, the initial offer must contain candidates also for RTCP, as it is still now known whether the answerer will support rtcp-mux.

My suggestion is to mandate BUNDLE entities to support rtcp-mux.

Regards,

Christer

From: Bernard Aboba [mailto:bernard_aboba@hotmail.com]
Sent: 3. toukokuuta 2013 8:13
To: Dale R. Worley; Christer Holmberg
Cc: mmusic@ietf.org
Subject: RE: [MMUSIC] BUNDLE: mandate RTP/RTCP multiplexing?

> But it doesn't seem that there is much to gain by mandating rtcp-mux
> in the first offer/answer, the one where actual bundling is not being
> done. All of the RTP/RTCP routing code that is active at that point
> has to support non-rtcp-mux operation already.

[BA]  Support for rtcp-mux in the first offer/answer is mandated by RFC 5761 Section 5.1.3:


   The initial SDP offer MUST include this

   attribute at the media level to request multiplexing of RTP and RTCP

   on a single port.

[RFC5761]  Section 5.1.3 also requires a fallback port for RTCP in the offer, in case the answerer doesn't support RTCP-mux:


   If it is desired to use both ICE and multiplexed RTP and RTCP, the

   initial offer MUST contain an "a=rtcp-mux" attribute to indicate that

   RTP and RTCP multiplexing is desired and MUST contain "a=candidate:"

   lines for both RTP and RTCP along with an "a=rtcp:" line indicating a

   fallback port for RTCP in the case that the answerer does not support

   RTP and RTCP multiplexing.  This MUST be done for each media where

   RTP and RTCP multiplexing is desired.


Given the existing normative text,  and all the other problems we need to solve, I think the burden of proof is on those who advocate deviation from RFC 5761.

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