Hi, In the default configuration, the internal profile listen port 5060 and external profile listen port 5080. And follow the setting in http://wiki.freeswitch.org/wiki/NAT_Traversal vars.xml <X-PRE-PROCESS cmd="set" data="bind_server_ip=59.120.xx.xx"/> <X-PRE-PROCESS cmd="set" data="external_sip_ip=stun:stun.freeswitch.org"/> <X-PRE-PROCESS cmd="set" data="external_rtp_ip=stun:stun.freeswitch.org"/> internal.xml <param name="ext-rtp-ip" value="$${external_rtp_ip}"/> external.xml <param name="ext-sip-ip" value="$${external_sip_ip}"/> <param name="ext-rtp-ip" value="$${external_rtp_ip}"/> When user make a SIP call from public network using external profile(5080), he encountered no audio. Here is the SDP of 200 OK from FS to user. /v=0// //o=FreeSWITCH 1366781127 1366781128 IN IP4 10.0.110.33// //s=FreeSWITCH// //c=IN IP4 10.0.110.33// //t=0 0// //m=audio 10568 RTP/AVP 18 101// //a=rtpmap:18 G729/8000// //a=fmtp:18 annexb=no// //a=rtpmap:101 telephone-event/8000// //a=fmtp:101 0-16// //a=silenceSupp:off - - - -// //a=ptime:20// //m=video 10530 RTP/AVP 116// //a=rtpmap:116 H264/90000// //a=fmtp:116 profile-level-id=428014/ When user make a SIP call from public network using internal profile(5060), everything OK. Here is the SDP of 200 OK from FS to user. /v=0// //o=FreeSWITCH 1366780920 1366780921 IN IP4 //59.120.xx.xx// //s=FreeSWITCH// //c=IN IP4 //59.120.xx.xx// //t=0 0// //m=audio 10892 RTP/AVP 18 101// //a=rtpmap:18 G729/8000// //a=fmtp:18 annexb=no// //a=rtpmap:101 telephone-event/8000// //a=fmtp:101 0-16// //a=silenceSupp:off - - - -// //a=ptime:20// //m=video 10178 RTP/AVP 116// //a=rtpmap:116 H264/90000// //a=fmtp:116 profile-level-id=428014// / I can't figure out which parameters in sofia profile or in dialplan make port 5060 set the public IP in SDP and work fine. Any advice? Thanks in advance. Jimmy