Re: [MMUSIC] Offer/Answer PT Questions - text proposal

[Roman Shpount <[e-mail]>]

One potential solution is to generate any offer in such a way that it will
be compatible with all the completed O/A exchanges for this end point. If
an end point receives an offer which is not compatible with existing state,
i.e. an offer which is reusing one of the PT for a different codec profile
similar, this end point must allocate new transport (use new local
address/port or new local set of candidates in case of ICE) for the answer
and consider this a start of the new session (discard all the PT use
history). If new transport cannot be allocated, for instance if responding
to an offer with ICE and existing ufrag, then offer must be refused with
488 or m line with port 0. This way end point can always uniquely map the
PT to the codec profile based on PT and local transport where the packet is
received. In case of 3pcc, an end point might get an offer which is
incompatible with its PT use history; allocate new local transport, and
handle it as a new RTP session.

What do you think?
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Roman Shpount