Hello, Yes of course. Here is some details :
Kamailio config : alias="IP_PRIV_KAMAILIO_SITE_B" listen=tcp:IP_PRIV_KAMAILIO_SITE_B:5060 advertise IP_PUBLIQUE_SITE_B:5060
I also configured RTP Engine : interface = KAMAILIO_IP_PRIV_SITE_B!IP_PUBLIQUE_SITE_B listen-ng = KAMAILIO_IP_PRIV_SITE_B:2223
Here is the SDP answering from SITE A to SITE B: SIP/2.0 200 Answering Record-Route: sip:IP_PUBLIQUE_SITE_A;transport=tcp;lr;ftag=F3D17100-4B77D8CB;did=541.30f2;nat=yes Record-Route: sip:IP_PUBLIQUE_SITE_B;transport=tcp;lr;ftag=F3D17100-4B77D8CB;did=541.d551;nat=yes Via: SIP/2.0/TCP phone_site_B:5060;rport=60620;branch=z9hG4bK2D80151007ed0c01a8c0 From: "22-3283278309681.ABCDPHONEB" sip:101@KAMAILIO_IP_PRIV_SITE_B;tag=F3D17100-4B77D8CB To: sip:3283278309681.ABCD@SITE_A_DOMAIN;tag=c2daa2041dba02fd CSeq: 2 INVITE Call-ID: b553f084-90e45fef-61ca1252@phone_site_B Server: baresip v3.15.0 (x86_64/Linux) Contact: sip:phone_site_A.@IP_PUBLIQUE_SITE_A:5060;transport=tcp;alias=phone_site_A~55590~2 Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,NOTIFY,INFO,MESSAGE,UPDATE,REFER Supported: gruu,replaces,norefersub Content-Type: application/sdp Content-Length: 1153
v=0 o=- 1428244366 302624626 IN IP4 IP_PUBLIC_TURN_SITE_A s=- c=IN IP4 IP_PUBLIC_TURN_SITE_A t=0 0 m=audio 41762 RTP/AVP 9 0 8 119 c=IN IP4 IP_PUBLIC_TURN_SITE_A b=AS:128 a=rtpmap:9 G722/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:119 telephone-event/8000 a=fmtp:119 0-15 a=rtcp:41763 IN IP4 IP_PUBLIC_TURN_SITE_A a=sendrecv a=ssrc:322326744 cname:sip:3283278309681.ABCD@SITE_A_DOMAIN a=minptime:20 a=ptime:20 a=label:1 m=video 44252 RTP/AVP 109 110 c=IN IP4 IP_PUBLIC_TURN_SITE_A b=AS:1920 a=rtpmap:109 H264/90000 a=fmtp:109 packetization-mode=0;profile-level-id=42e01f;max-mbps=108000;max-fs=3600;max-br=2048 a=rtpmap:110 H264/90000 a=fmtp:110 packetization-mode=1;profile-level-id=42e01f;max-mbps=108000;max-fs=3600;max-br=2048 a=rtcp:44253 IN IP4 IP_PUBLIC_TURN_SITE_A a=sendrecv a=ssrc:4213384512 cname:sip:3283278309681.ABCD@SITE_A_DOMAIN a=framerate:30.00 a=rtcp-fb:* nack a=rtcp-fb:* nack pli a=content:main a=label:2 m=application 43622 UDP/BFCP * c=IN IP4 IP_PUBLIC_TURN_SITE_A a=floorctrl:c-s a=setup:actpass a=confid:1005 a=userid:6 a=floorid:1 mstrm 3 a=connection:new m=application 0 RTP/AVP 0