El Monday 16 June 2008 15:31:08 Suganya D escribió: > Hi, > > The following clarification is needed regarding processing of a CANCEL > message at UAS end: > > When the CANCEL request contains a CSeq number that is not the same as > the INVITE request it is trying to cancel, what is the appropriate > error message to be sent to the UAC?
I assume the only escenario in which this issue can occurs is when the CANCEL arrives to the UAS before the INVITE. 21.4.19 481 Call/Transaction Does Not Exist This status indicates that the UAS received a request that does not match any existing dialog or transaction. Note that 481 is also valid for not matching transactions, not just dialogs. Of course we can say here that a CANCEL is a new transaction but since it's 99% closed to the INVITE I think a 481 is a valid response. -- Iñaki Baz Castillo [EMAIL PROTECTED] _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
