[MMUSIC] Some more APPID questions

[Harald Alvestrand <[e-mail]>]

On reviewing the appid document and some of the mail on it.. some questions.

I understand that an appid can serve multiple purposes; FEC binding and
loudest-speaker selection being two examples.

Some of these give information that is completely outside the context of
RTP / SDP, so they have to be application specified. Others are within
the RTP/SDP ecosystem.
Thus:

- Can one SSRC have mulitple appids?
This seems necessary for those multiple functions to work at the same
time without treading on each other, but isn't stated explicitly in the
draft.

- What's the uniqueness criterion for appids?
It would seem logical to have them unique at the source, but at least in
one case (recv-appid), it is given by the destination. Are we depending
on statistical uniqueness, or is the uniqueness governed by some other
mechanism?

I'll send off these 2 questions now, in order to make the thread be
focused....


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