A major difficulty is that the only IP/port/transport that you *know* the sender is listening on is the one specified in the Via. Many if not most SIP elements will properly process a SIP message no matter what port it is received on, but there is no guarantee that the sending element is listening on any other port than the one described in the Via. Since TCP and UDP have separate port-number spaces, you cannot convert a UDP port number into a TCP port number.
Dale _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
