ubuntu 18.04 , kamailio v5.3.8 : UE A and B register sucess on kamailio server over tcp. When UE A calls UE B, kamailio server receive the INVITE over tcp from UE A, then it send invite to UE B. But the invite sent by kamailio to UE B is over UDP. Then UE B returns ICMP Destination unreachable(Port unreachable). Is the error configuration related or a bug? Any kind of help is highly appreciated. Best Regards, -- Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/3203 You are receiving this because you are subscribed to this thread. Message ID: <kamailio/kamailio/issues/3203(a)github.com>