Hi, I found the no_media=true is not working properly. when set <action application="set" data="no_media=true" /> 192.168.0.150 192.168.0.28 192.168.0.77 UA freeswitch UA INVITE (SDP)-----> | --------> INVITE (SDP) c=IN IP4 192.168.0.150 | c=IN IP4 192.168.0.150 | 183 (SDP)<----------- | <----------- 183 (SDP) c=IN IP4 192.168.0.150 | c=IN IP4 192.168.0.150 | | <--------------- 200 OK(SDP) <--------no message | c=IN IP4 192.168.0.150 | 480 <------------------------- | but when I set the no_media=false, the session can establish successfully. the version i'm using freeswitch@ngsw-dev3> version FreeSwitch Version 1.0.hacked Regards, Sam Jiang