Re: Is SDP in an unreliable response "the answer" ???

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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