Hi I’m looking to check if what I’m trying to configure is feasible . UA -> WAN(X.X.X.X) -> Kamailio(LAN 192.X.X.148) -> internal PBX(LAN 192.X.X.131) I have a WN IP forwarded to and internal Kamailio server which is sitting in front of an asterisk server. SIP requests are sent to asterisk from Kamailio via dispatcher . SIP client can register via WAN and Kamailio to asterisk , I have rtpenine configured as below. /usr/sbin/rtpengine --interface=192.X.X.148!X.X.X.X --listen-ng=7722 --timeout=60 --silent-timeout=3600 --pidfile=/var/run/ngcp-rtpengine-daemon.pid --table=0 --log-level=6 --log-facility=local7 --log-facility-rtcp=local7 --homer=192.168.200.5:9060 --homer-protocol=udp --homer-id=2002 But SIP SDP when sent to asterisk is still show the WAN IP of the Sip client in the SDP offer that goes to asterisk , ive tried adding parameter “*via-branch=” **and “**auto-bridge” **to rtpengine_offer but they don’t seem to make a difference , is there anyone way I can force the SDP offer that goes to the backend PBX to use the IP of Kamailio server that rtpengine is running on rather that the WAN IP that I’m advertising(X.X.X.X) ?* Example SIP SDP from WAN client to asterisk *INVITE* sip:*97@sip.domain.com;transport=UDP SIP/2.0 Via: SIP/2.0/UDP Client-IP:29345;branch= *z9hG4bK-524287-1---e38082af1f110ad1*;rport Max-Forwards: 70 Contact: <sip:21@Client-IP:29345;transport=UDP> To: <sip:* 97(a)sip.domain.com;transport=UDP&gt; From: <sip:21@sip.domain.com;transport=UDP>;tag=*e637343b* Call-ID: *jvqeIB9f48_OGcTq0UxP7w..* CSeq: 2 *INVITE* Allow: *INVITE*, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE Content-Type: application/sdp User-Agent: Zoiper rv2.8.40 o=Z 0 0 IN IP4 Client-IP s=Z c=IN IP4 Client-IP t=0 0 m=audio 29344 RTP/AVP 8 0 101 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=sendrecv and SDP that Kamailio sends to asterisk *INVITE* sip:*97@sip.domain.com;transport=UDP SIP/2.0 Record-Route: <sip:192.X.X.148;lr> Via: SIP/2.0/UDP 192.X.X.148;branch= *z9hG4bKd924.bcc4248735b53e9cf783c87c81dfee28.0* Via: SIP/2.0/UDP Client-IP:29345;received=Clien t-IP;branch=z9hG4bK-524287-1---e38082af1f110ad1;rport=29345 Max-Forwards: 69 Contact: <sip:21@Client-IP:29345;transport=UDP> To: <sip:* 97(a)sip.domain.com;transport=UDP&gt; From: <sip:21@sip.domain.com;transport=UDP>;tag=*e637343b* Call-ID: *jvqeIB9f48_OGcTq0UxP7w..* CSeq: 2 *INVITE* Allow: *INVITE*, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE Content-Type: application/sdp User-Agent: Zoiper rv2.8.40 Path: <sip:192.X.X.148;lr;received=sip:Client-IP:29345> v=0 o=Z 0 0 IN IP4 Client-IP s=Z c=IN IP4 X.X.X.X t=0 0 m=audio 32550 RTP/AVP 8 0 101 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=sendrecv a=rtcp:32551 a=ice-ufrag:Dwd23Dem a=ice-pwd:9Itp6Cq7lkYJxMkeDeA1I2kkzw a=candidate:KZyzUR5lXJJpt1Et 1 UDP 2130706431 X.X.X.X 32550 typ host a=candidate:KZyzUR5lXJJpt1Et 2 UDP 2130706430 X.X.X.X 32551 typ host *Gerry Kernan* <image001.jpg> *Infinity IT | 17 The Mall | Beacon Court | Sandyford | Dublin D18 E3C8 | Ireland* *Tel: +353 - (0)1 - 293 0090 <+353%201%20293%200090> | E-Mail: * gerry.kernan(a)infinityit.ie *Managed IT Services Infinity IT* - www.infinityit.ie *IP Telephony Asterisk Consulting* – www.asteriskconsulting.com *Contact Centre Total Interact* – www.totalinteract.com _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users