AFAIK, both of the flows are incorrect. In first case, if SDP offer is in reliable provisional response, PRACK must contain SDP answer. UPDATE can be used any time once SDP offer answer has been done in provisional response and PRACK.
Best Regards, Vivek Batra On Fri, Dec 18, 2015 at 6:15 PM, Sourav Dhar Chaudhuri < sourav_mi...@yahoo.co.in> wrote: > Hi, Please refer the diagram below Callflow diagram > > 1) A ------------- INVITE [ Support: 100 rel] without SDP > ------------------> B > 2) A <-------------- 180 Ringing [Require: 100 rel] with SDP offer > ------------ B > 3) A ---------------- PRACK without SDP > ------------------------------------------> B > 4) A <---------------- 200OK for PRACK > ------------------------------------------------- B > 5) A ------------------- UPDATE with SDP answer > ----------------------------------> B > 6) A <----------------------- 200OK for UPDATE > -------------------------------------------- B > 7) A <----------------------- 200OK for INVITE > ----------------------------------------------- B > 8) A ------------------------------ ACK > -----------------------------------------------------------> B > > Whether the above Call flow Diagram is a valid one? I mean without > sending SDP in PRACK [in frame 3]as per RFC 3262, can I send it using > UPDATE as per RFC 6337? > Also is the below call flow DIAGRAM is also valid. > 1) A ------------- INVITE [ Support: 100 rel] without SDP > ------------------> B > 2) A <-------------- 180 Ringing [Require: 100 rel] with SDP offer > ----------- B > 3) A -------------------- PRACK without SDP > ------------------------------------------> B > 4) A <------------------- 200OK for PRACK > --------------------------------------------- B > 5) A <----------------------- 200OK for INVITE > ----------------------------------------------- B > > 6) A ------------------------------ ACK with SDP answer > -------------------------------> B > Here without sending SDP in PRACK [in frame 3]as per RFC 3262, can I send > it by ACK? > > > Thanks, > Sourav > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > -- Best Regards, Vivek Batra _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
