Hi, I make an experiment as follows. - Person A send five calls to person B via the SER (1.Person A send five calls to the SER with SIP over TCP(one socket per call)) (2.The SER forwards five calls to person B with SIP over TCP(one socket per call)) So,I added "forward_tcp(uri:host,uri:port);" to ser.cfg file. In the result,the SER can forward five calls to B with SIP over TCP(only one socket) But,the SER can't forward five calls to B with one socket per call. How can the SER forward the calls to B with one socket per call? Is this possible ? Thanks, Taro