How media will be established without sdp in ack? Offer answer is not complete. I think session cannot be established here.
Is it possible to attach working tcpdump for understanding. Regards, Venkat Ramana On Thu 24 May, 2018, 1:55 AM Abhishek, <abhishek.pha...@gmail.com> wrote: > Hello Paul, > Thank you very much for response. > > We could see with some of the peer nodes that Call is continuing even if > ACK message does not carry SDP. > > Best Regards, > Abhishek Phadke > > > On 23-May-2018, at 22:38, Paul Kyzivat <pkyzi...@alum.mit.edu> wrote: > > > > Abhishek, > > > >> On 5/23/18 7:15 AM, Abhishek wrote: > >> Hello, > >>> SS7 Switch —> Gateway Switch —> SIP SBC > >>> > >>> Call flow is as mentioned. > >>> > >>> SIP call gets established between Gateway Switch node and SIP SBC node. > >>> > >>> > >>> Gateway Switch node initiates Re Invite without SDP. > >>> > >>> SIP SBC node responds with 200 OK along with SDP keeping all fields > same as previous 200 OK including ‘sess-version’ field. > >>> > >>> Gateway Switch node acknowledge this message with ACK without SDP. > >>> > >>> SIP SBC node sends BYE to this response and mentions Reason as > cause=488, No answer to offer. > >>> > >>> > >>> Would like to understand way forward for resolution of this issue. > > > > While the details are sketchy, IIUC then the Gateway Switch is clearly > in error - it is required to include answer SDP in the ACK. > > > > Thanks, > > Paul > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
