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Re: [MMUSIC] Sending a=rtcp-mux-only w/o a=rtcp-mux - PULL REQUEST

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 15 February 2017 10:06 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, Roman Shpount <roman@telurix.com>, Paul Kyzivat <paul.kyzivat@comcast.net>
Thread-Topic: [MMUSIC] Sending a=rtcp-mux-only w/o a=rtcp-mux - PULL REQUEST
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Date: Wed, 15 Feb 2017 10:05:53 +0000
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Subject: Re: [MMUSIC] Sending a=rtcp-mux-only w/o a=rtcp-mux - PULL REQUEST
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Hi,

I have created a pull request with the suggested changes:

https://github.com/cdh4u/draft-mux-exclusive/pull/2

At this point I think we should ONLY focus on this particular change. Any other comments people may have should have been given a long time ago…

Regards,

Christer

From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Christer Holmberg
Sent: 14 February 2017 21:17
To: Roman Shpount <roman@telurix.com>; Paul Kyzivat <paul.kyzivat@comcast.net>
Cc: mmusic@ietf.org
Subject: Re: [MMUSIC] Sending a=rtcp-mux-only w/o a=rtcp-mux

Hi,

Also, if the offerer receives an answer, without a=rtcp-mux, it must take proper action for disabling the RTP session associated with the m- line.

Regards,

Christer

From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Roman Shpount
Sent: 14 February 2017 20:45
To: Paul Kyzivat <paul.kyzivat@comcast.net<mailto:paul.kyzivat@comcast.net>>
Cc: mmusic@ietf.org<mailto:mmusic@ietf.org>
Subject: Re: [MMUSIC] Sending a=rtcp-mux-only w/o a=rtcp-mux

On Tue, Feb 14, 2017 at 1:14 PM, Paul Kyzivat <paul.kyzivat@comcast.net<mailto:paul.kyzivat@comcast.net>> wrote:
On 2/14/17 12:29 PM, Roman Shpount wrote:
Hi,

1. In the offer BOTH rtcp-mux and rtcp-mux-only MUSTbe included
2. In the answer rtcp-mux MUST be included or the session should be
terminated. rtcp-mux-only MUST NOT be included.

Do you mean the RTP session must be terminated, or the *signaling* session?

Requiring the signaling session to be terminated is overreaching. But I would agree that refusing the m-line (with port=0) is the proper alternative to accepting the rtcp-mux.

This should be handled the same way as getting back unexpected or error answer for a specific m= line. Either RTP session associated with the specific m= line needs to be terminated with port=0 or the whole signaling session should be terminated. Most importantly, RTP session associated with m= line MUST not continue to run expecting RTCP on rtp port + 1. Essentially, rtcp-mux-only should be treated as a promise by the offering party that it will not accept an answer without rtcp-mux.

Regards,
_____________
Roman Shpount

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