Hi List, Are there any softphones or proxies that do send an SDP offer in PRACK? Also what will be the scenario? The only scenarios I can think of are:
Case 1: UA1 -> INVITE with SDP offer -> UA2 UA1 <- 180 rel with SDP answer <- UA2 UA1 -> PRACK with new/diff SDP offer -> UA2 UA1 <- 200 OK to PRACK with SDP answer <- UA2 UA1 <- 200 OK to INVITE with/without SDP answer <- UA2 Case 2: This seems wrong as it is there in some RFC that the first reliable provisional response should contain an offer if the initial INVITE did not contain one. UA1 -> INVITE without SDP offer -> UA2 UA1 <- 180 rel without SDP offer <- UA2 UA1 -> PRACK with SDP offer -> UA2 UA1 <- 200 OK to PRACK with SDP answer <- UA2 UA1 <- 200 OK to INVITE without SDP answer <- UA2 Best Regards, Elison _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
