I have not seen anywhere confirmation one way or another on this topic.
F1 A ----- INVITE -------> B F2 A <----- 183 ------------ B F3 A ----- CANCEL ----> B F1 contains From tag. F2 contains From tag and To tag The question is: Is the F3 CANCEL required to send both From and To tags? RFC 3261 Section 9.1 states... The following procedures are used to construct a CANCEL request. The Request-URI, Call-ID, To, the numeric part of CSeq, and From header fields in the CANCEL request MUST be identical to those in the request being cancelled, including tags. Thanks. Del Stevens CopperCom <www.coppercom.com> _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
