Kevin P. Fleming wrote:
Paul Kyzivat wrote:
- a PRACK. But a PRACK can only be sent in response to a reliable
provisional. The assumption here is that the answer has not been sent
in a reliable provisional yet. So the PRACK would only be an option
if a reliable provisional *without* SDP was sent after sending an
answer in an unreliable provisional. This is a very weird case.
Is this even allowed? I would think that once an answer has been sent in
an unreliable provisional response, the identical answer MUST be
included in (at least) the first reliable provisional response if one is
sent. Allowing any sort of reliable response that does not contain an
identical copy of the answer that was sent in an unreliable response
seems like a recipe for disaster.
Its hard to imagine why the UAS would do such an odd thing. But AFAIK it
is not *forbidden* from sending a reliable provisional without the answer.
I don't see it as a recipe for disaster if the UAC is carefully
constructed. But based on the range of behavior in the wild, I think
this might have a high probability of working unpredictably.
Thanks,
Paul
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