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

Suhas Nandakumar <suhasietf@gmail.com> Wed, 09 March 2016 15:28 UTC

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Date: Wed, 09 Mar 2016 07:11:09 -0800
Message-ID: <CAMRcRGTt2rJEOo5ehq8ySbUWjcBqYHQ5hy8KGYB8XzTPM44QGQ@mail.gmail.com>
From: Suhas Nandakumar <suhasietf@gmail.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>
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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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Was ice-options=rtcp-mux-only  considered as a candidate to say this. Since
we are discussing the rtcp-mux-only option  the ICE context ,  ice-options
could be an option and it has  O/A semantics clearly defined.

On Tue, Mar 8, 2016 at 11:09 PM, Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

> 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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