Hi Daniel, I will try to answer your questions. Hope it helps. The SIP stack(application and Transport layer) can be primarily viewed as below
---------------------------------- | Transaction User(TU) | --------------------------------- | Transaction Layer | -- ------------------------------ | Transport Layer | -------------------------------- So basically even if the INVITE transaction is destroyed on receipt of 200 OK, the ACK will still be sent. So the INVITE client transaction(TU) will send the ACK and the INVITE Server transaction(TU) will handle the ACK. Regards Harsha _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
