2010/4/30 Klaus Darilion klaus.mailinglists@pernau.at:
200 OK seems correct as long as the transaction is still in memory.
I don't agree. As per RFC 3261 when a proxy receives a 200 for an INVITE the transaction is terminated so a CANCEL after the 200 should not match such transaction. Then the proxy should reply 481 to the CANCEL rather than a 200.