Hi Hong, this sceanrio is not rfc conform. If the INVITE has no SDP body the 200 OK and the ACK must have a SDP body.
Read RFC 3264 - An Offer/Answer Model with Session Description Protocol (SDP). Regards, Markus asura_hzk wrote: > hello,everyone ,I met a scenario like this > > Sip server Sip Client > INVITE(without SDP) > -------------------> > 200 OK(with SDP) > <------------------ > ACK(without SDP) > -------------------> > ACK(with SDP) > -------------------> > > The first ACK is just for stopping the retransmitting "200 ok",I thought, > Because the second ACK should be received after the remote client accepted > the > call.The server is not developped by ourselves,So I dont know whether this > implementation complies to RFC? > > Waiting for your instruction,Thank you! > > _______________________________________________ > 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
