Hi List, I have a Kamailio3.1 server and RTPProxy running in WAN. The calls between UA will automatically terminated in Callee UA side 36s after connected, while no one sends a BYE. While Kamailio and UA are in LAN at all , everything is just working well. Is it my rtpproxy doesn't working correctly or something else is wrong? What can I do to fix it. Any hint?? BTW, Kamailio is installed following official guide http://www.kamailio.org/dokuwiki/doku.php/install:kamailio-3.1.x-from-git The kamailio.cfg wasn't changed at all except for below: ----------------------------------------------------------------------------------------- 1) adding the following lines: #!define WITH_MYSQL #!define WITH_AUTH #!define WITH_USRLOCDB #!define WITH_NAT 2)uncommenting the line below in route[REGISTRAR], setbflag(FLB_NATSIPPING); 3)change rtpproxy port corresponding modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:22222") ----------------------------------------------------------------------------------------- and my rtpproxy1.2.1 was installed by apt-get install rtpproxy, with 1) /etc/default/rtpproxy changed into: # Defaults for rtpproxy # The control socket. #CONTROL_SOCK="unix:/var/run/rtpproxy/rtpproxy.sock" # To listen on an UDP socket, uncomment this line: CONTROL_SOCK=udp:127.0.0.1:22222 LISTEN_ADDR=xx.xx.xx.xx # Additional options that are passed to the daemon. EXTRA_OPTS="-l ${LISTEN_ADDR}" 2) and started by rtpproxy -l xx.xx.xx.xx -s udp:localhost:22222 -u kamailio Your help will be great appreciated. Coca