Have you tried setting externip=
In the [general] of your sip.conf? From: asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Eyal Goltzman Sent: Monday, July 05, 2010 1:58 PM To: 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: [asterisk-users] How to change the IP in the SIP contact header Hello, I'm trying to use a SIP trunk service and the provider ask me to have the IP address of the contact header as my public IP and not as my private one, how can I do it? See attached the SIP invite where a.b.c.d is the SIP server IP and x.y.z.w is my public address: sipINVITE sip:144@ a.b.c.d SIP/2.0 Via: SIP/2.0/UDP 10.100.101.107:5060;branch=z9hG4bK76d52819;rport Max-Forwards: 70 From: "Polycom" <sip:100@ x.y.z.w>;tag=as7435100b To: <sip:144@ a.b.c.d > Contact: <sip:1...@10.100.101.107> Call-ID: 08116cf06661dc091de10c1b3315d...@84.94.96.110 CSeq: 102 INVITE User-Agent: Asterisk PBX Date: Mon, 05 Jul 2010 15:49:31 GMT Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO Supported: replaces, timer Content-Type: application/sdp Content-Length: 292 v=0 o=root 1812163927 1812163927 IN IP4 10.100.101.107 s=Asterisk PBX 1.6.1.20 c=IN IP4 10.100.101.107 t=0 0 m=audio 18848 RTP/AVP 0 8 101 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=silenceSupp:off - - - - a=ptime:20 a=sendrecv
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