Hi, So the scenario is that SDP offer/answer exchange has already happened in INVITE and 200 OK.Now ACK is received with some unsupported Content-type and message body.What should be the B2BUA behaviour? - Should message body be removed before ACK is passed on to UAC side?- Should call be dropped because B2BUA could not parse message body?- Should B2BUA pass the ACK and message body to UAC side? Regards,Amrita _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors