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Re: [MMUSIC] WGLC on draft-ietf-mmusic-mux-exclusive-03.txt

Martin Thomson <martin.thomson@gmail.com> Wed, 02 March 2016 02:10 UTC

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Date: Wed, 02 Mar 2016 13:10:36 +1100
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From: Martin Thomson <martin.thomson@gmail.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>
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Cc: Flemming Andreasen <fandreas@cisco.com>, mmusic <mmusic@ietf.org>, "draft-ietf-mmusic-mux-exclusive@ietf.org" <draft-ietf-mmusic-mux-exclusive@ietf.org>
Subject: Re: [MMUSIC] WGLC on draft-ietf-mmusic-mux-exclusive-03.txt
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On 1 March 2016 at 18:52, Christer Holmberg
<christer.holmberg@ericsson.com> wrote:
> We agreed earlier to not update existing mechanisms. I think we should keep 5761 it as it is, for backward compatibility, because there are deployments that use it.

5761 creates a bind: it expressly prohibits the thing that this draft
sets out to do.  I don't see any harm in updating it, it's not like it
will suddenly affect 5761 implementations that rely on backwards
compatibility.

> People did not want a solution where one starts sending stuff and then realize it doesn't work.

This *IS* that solution.  An answerer that doesn't understand this new
attribute and doesn't want to multiplex will send stuff to the wrong
place if we omit a=rtcp.  Nothing to be done about that other than
what is already in the draft.

> Also, intermediaries will may still reserve resources for RTCP, as they don't know whether it will be used or not.

That is also a good argument for the attribute.  That sounds like a
good thing to add to the draft.

> But, again, it was earlier agreed to not update existing mechanisms (RFC 5761 etc), and I really would not like to change that decision at this point.

I apologize if I'm going back on established consensus, but I think
that is a mistake.  The magnitude of the update is small.

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