There was a lot of discussion and disagreement at SIPit21 about
whether the following 200 OK is allowed (or should) have SDP in it:
INVITE (offer)
-------->
18x (with 100rel) (answer)
<--------
PRACK
--------->
200 OK (can this carry SDP?)
<---------
ACK
--------->
I couldn't find anything definitive in RFC form. Paul's offeranswer
draft talks about this I think.
If I understand things, the right answer here is that it's not
supposed to carry any SDP and that you should ignore it if it shows up.
The question is, other than waste, what can go wrong if it is there?
When we end up with clear text around the requirement, will
it say SDP SHOULD NOT, or MUST NOT appear?
Or do I have this wrong?
RjS
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