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Re: [MMUSIC] Not fixing a=rtcp and rtcp-mux exclusive

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 22 January 2016 09:53 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Kevin Dempsey <kevindempsey70@gmail.com>
Thread-Topic: [MMUSIC] Not fixing a=rtcp and rtcp-mux exclusive
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Date: Fri, 22 Jan 2016 09:53:07 +0000
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Cc: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] Not fixing a=rtcp and rtcp-mux exclusive
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Hi,

>Would changing the protocol field of the m= line make sense in this case? For example:
>
>c=IN IP4 11.22.33.44
>m=12345 RTPMUX/AVP 0 99
>
>Endpoints that don't support mux-exclusive should reject that m= line.

I guess it could be done that way, but personally I don't think it would be semantically correct. Also, we use "RTP" when negotiating non-exclusive mux, and when muxing bundled RTP streams.

Regards,

Christer

On 22 January 2016 at 08:27, Christer Holmberg <christer.holmberg@ericsson.com> wrote:
Hi,

> We can for sure define a new attribute, if people prefer that.
>
> But, it still wouldn't solve Paul's issue, that a non-ICE endpoint that doesn't support the attribute may start sending RTCP on RTP+1. But, at least the offerer would see from the answer that the answerer does not support mux-exclusive, and can take proper actions.
>
> We can define new attribute that specifies address and port for both RTP and RTCP similar to ICE candidate or a=rtcp attribute and set address in c= line to IN IP4 0.0.0.0. This way any end point that does not understand this attribute will send no media.

Another option would be to set the m- line port to zero, like we do for bundle-only. Then, if the answerer doesn't support the attribute, it won't use the m- line.

Example:

c=IN IP4 11.22.33.44
m=0 RTP/AVP 0 99
a=mux-exclusive: 12345  <------- 12345 is the port to be used for RTP and RTCP

Regards,

Christer
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