Hello, I have a kamailio on SITE A using a public IP. I'm trying to setup another kamailio on SITE B with NAT.
When I try to make a call from SITE B to SITE A, the call is initiated but when comes the SDP my equipment on SITE B does not reply to SDP sent by kamailio on SITE A.
I made some test and use only Public IP between the 2 sites and it works properly. So I think that I have a problem on my NAT configuration or maybe I'm missing something. Can someone help me one this problem ? Do you have an idea on what could be blocking. Thank in advance for your help. Regards, Nathan
Can you share configuration snippets and packet capture snippets?
Perhaps including the SDP so you can show us what's missing?
Thanks
David
On Tue, Jul 15, 2025 at 10:12 AM Nathan C via sr-users < sr-users@lists.kamailio.org> wrote:
Hello, I have a kamailio on SITE A using a public IP. I'm trying to setup another kamailio on SITE B with NAT.
When I try to make a call from SITE B to SITE A, the call is initiated but when comes the SDP my equipment on SITE B does not reply to SDP sent by kamailio on SITE A.
I made some test and use only Public IP between the 2 sites and it works properly. So I think that I have a problem on my NAT configuration or maybe I'm missing something. Can someone help me one this problem ? Do you have an idea on what could be blocking. Thank in advance for your help. Regards, Nathan __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions -- sr-users@lists.kamailio.org To unsubscribe send an email to sr-users-leave@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender!
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
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David Tek -
Nathan C