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Re: [MMUSIC] Why do we need rtcp-mux-exclusive?

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 09 March 2016 07:10 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, Martin Thomson <martin.thomson@gmail.com>, Bernard Aboba <bernard.aboba@gmail.com>
Thread-Topic: [MMUSIC] Why do we need rtcp-mux-exclusive?
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Date: Wed, 09 Mar 2016 07:09:57 +0000
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Cc: Flemming Andreasen <fandreas@cisco.com>, mmusic WG <mmusic@ietf.org>
Subject: Re: [MMUSIC] Why do we need rtcp-mux-exclusive?
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Any opinions?

If I remember correctly, it was mainly Roman who didn't want to use a=ssrc. However, it does seem like a straight forward (and most backward compatible) mechanism.

Regards,

Christer


-----Original Message-----
From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Christer Holmberg
Sent: 08 March 2016 09:19
To: Martin Thomson <martin.thomson@gmail.com>; Bernard Aboba <bernard.aboba@gmail.com>
Cc: Flemming Andreasen <fandreas@cisco.com>; mmusic WG <mmusic@ietf.org>
Subject: Re: [MMUSIC] Why do we need rtcp-mux-exclusive?


Hi,

We could update 5761, by adding an ³ICE Considerations² section, where we say that a=rtcp-mux and RTP candidates only indicates exclusive mux.
Obviously, we would have to assume that RTCP candidates won¹t be provided later (using trickle).

Another alternative would be to go back to the original suggestion of using a=rtcp:0 (zero port value) to indicate exclusive mux. That would work also for non-ICE. In that case we would need to remove usage of
a=rtcp:0 for trickle ICE, as previously discussed.

Regards,

Christer



On 08/03/16 08:21, "Martin Thomson" <martin.thomson@gmail.com> wrote:

>On 8 March 2016 at 17:03, Bernard Aboba <bernard.aboba@gmail.com> wrote:
>> [BA] Since this relates to ICE, addressing it in RFC 5761bis does not 
>>make  much sense.
>
>I didn't suggest a -bis, which implies an overhaul, just a small patch.

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