CSeq contains sequence number and the method. CSeq header in the response to the CANCEL request shall contain the token "CANCEL".
regards On 30/04/07, Mushtaq Ilyas <[EMAIL PROTECTED]> wrote: > > RFC 3261 > "While a CANCEL request is handled in a stateful proxy by its own server > transaction, a new response context is not created for it. Instead, the > proxy layer searches its existing response contexts for the server > transaction handling the request associated with this CANCEL. If a > matching response context is found, the element MUST immediately return a > 200 (OK) response to the CANCEL request. In this case, the element is > acting as a user agent server as defined in Section 8.2. Furthermore, > the element MUST generate CANCEL requests for all pending client > transactions in the context as described in Section 16.7 step 10." > > Yes CANCEL is a distinct transaction but with same response context as the > INVITE it is cancelling? > The problem however is that using thesame response context causes an > abnormality is the state-machine. > > UA Client Proxy Server > ================================ > ---->Invite > <==180 > ---->Cancel > <==200 > ---->Cancel > <==200 or 487 (SIP Proxy > Server or UA Server) > > How would one identify that the 200 is for the Invite or Cancel? > > > Regards > Mushtaq Ilyas > > > ----- Original Message ---- > From: Ryan Mitchell <[EMAIL PROTECTED]> > To: [email protected] > Sent: Saturday, 28 April, 2007 11:34:34 PM > Subject: Re: [Sip-implementors] Cancel part of Invite transaction? > > My mistake -- CANCEL is a distinct transaction (RFC 3261 sec 9.1). The > cseq > value is used to match up on the INVITE that's being cancelled. > > For reverse compatibility with RFC 2543, the UAS may or may not send a 487 > (request terminated) response to the cancelled INVITE. I suspect this may > be the source of confusion -- with only a single 200 OK response for the > cancel you might guess there's only 1 transaction. > > -- > Ryan Mitchell > Telecom Logic, LLC > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > > > > > > ___________________________________________________________ > Yahoo! Mail is the world's favourite email. Don't settle for less, sign up > for > your free account today > http://uk.rd.yahoo.com/evt=44106/*http://uk.docs.yahoo.com/mail/winter07.html > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
