> In ACK generated by client transaction for non-200 responses > the bis clearly states that the topmost Via should be used > when constructing the ACK request. What about the ACK > generated for 200 OK? I guess that this kind of ACK should > have a unique Via branch ( not matching the ACKed INVITE's > branch) but I couldn't clearly derive it from bis. Could > someone please clarify what is the correct behaviour ?
After sending a 200 response, the UAS/proxy cannot rely upon the branch being the same because the prior proxy might not have added itself to the record-route. Thus it ultimately should not make a difference either way.
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