[SR-Users] 回复: kamailio Behind nat. How Record-Route should be added ？

UA(192.168.0.1) Kamailio(1v1 NAT) PBX | INVITE | | |  | INVITE | | | 183 | | 183 | | Kamailio received INVITE, then add Record-Route: <sip:kamailio_public_ip> UA(192.168.0.1) received 183, find Record-Route(kamailio_public_ip) then send ACK to Kamialio_public_ip not kamailio_internal_ip, so Kamailio can't receive ACK from UA。 UA and Kamailio are only connected to the intranet。 this is my config，192.168.0.1 -> Kamailio -> Other SBC(public ip) function ksr_request_route()       if KSR.is_INVITE() then             KSR.rr.record_route();             KSR.nathelper.fix_nated_contact()       end end this is packet capture 2023/10/07 10:31:13.112374 192.168.0.1:45642 -> 192.168.0.2:7080 INVITE sip:+8618626439917@192.168.0.2:7080 SIP/2.0 Via: SIP/2.0/UDP 192.168.0.11:45642;branch=z9hG4bK98457cb5b0e44505;rport Contact: <sip:05640@192.168.0.11:45642> Max-Forwards: 70 To: <sip:+8618626439917@192.168.0.2:7080> From: "05640" <sip:05640@192.168.0.2:7080>;tag=5c1a6b917a705e9e Call-ID: b430efcf360145c3 CSeq: 39379 INVITE Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,REFER,NOTIFY,SUBSCRIBE,INFO Supported: Content-Type: application/sdp Content-Length: 756 2023/10/07 10:31:13.115403 192.168.0.2:7080 -> 122.97.130.198:15060 INVITE sip:+8618626439917@122.97.130.198:15060;user=phone SIP/2.0 Record-Route: <sip:36.140.122.12:7080;lr;> Via: SIP/2.0/UDP 36.140.122.12:7080;branch=z9hG4bKe61a.5fe9d645ef1bbe470ca6d57fa20375bf.0 Via: SIP/2.0/UDP 192.168.0.1:45642;received=192.168.0.11;branch=z9hG4bK98457cb5b0e44505;rport=45642 Contact: <sip:05640@192.168.0.11:45642> Max-Forwards: 70 To: <sip:+8618626439917@122.97.130.198:15060;user=phone> From: "05640" <sip:02566043847@122.97.130.198:15060;user=phone>;tag=5c1a6b917a705e9e Call-ID: b430efcf360145c3 CSeq: 39379 INVITE P-Preferred-Service: urn:urn-7:3gpp-service.ims.icsi.mmtel Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,REFER,NOTIFY,SUBSCRIBE,INFO 2023/10/07 10:31:15.162198 122.97.130.198:15060 -> 192.168.0.2:7080 SIP/2.0 183 Session Progress Via: SIP/2.0/UDP 36.140.122.12:7080;rport=7080;branch=z9hG4bKe61a.5fe9d645ef1bbe470ca6d57fa20375bf.0 Via: SIP/2.0/UDP 192.168.0.1:45642;received=192.168.0.1;branch=z9hG4bK98457cb5b0e44505;rport=45642 Record-Route: <sip:36.140.122.12:7080;lr;> From: "05640" <sip:02566043847@28.commchina.net:15060;user=phone>;tag=5c1a6b917a705e9e To: <sip:+8618626439917@28.commchina.net:15060;user=phone>;tag=66DUcBjQy3erB Call-ID: b430efcf360145c3 CSeq: 39379 INVITE Contact: <sip:+8618626439917@192.168.0.166:17060;transport=udp> User-Agent: FreeSWITCH-mod_sofia/1.10.9.18+git~20230524T013825Z~2191e53372~64bit Accept: application/sdp Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, PRACK, NOTIFY 2023/10/07 10:31:15.163165 192.168.0.2:7080 -> 192.168.0.1:45642 SIP/2.0 183 Session Progress Via: SIP/2.0/UDP 192.168.0.11:45642;received=192.168.0.11;branch=z9hG4bK98457cb5b0e44505;rport=45642 Record-Route: <sip:36.140.122.12:7080;lr;> From: "05640" <sip:02566043847@28.commchina.net:15060;user=phone>;tag=5c1a6b917a705e9e To: <sip:+8618626439917@192.168.0.2:7080>;tag=66DUcBjQy3erB Call-ID: b430efcf360145c3 CSeq: 39379 INVITE Contact: <sip:+8618626439917@192.168.0.166:17060;transport=udp> User-Agent: FreeSWITCH-mod_sofia/1.10.9.18+git~20230524T013825Z~2191e53372~64bit Accept: application/sdp Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, PRACK, NOTIFY Supported: precondition, 100rel, path, replaces This question has been bothering me for a long time, help me ________________________________ 发件人: 城门 虾米 &lt;codenot(a)msn.com&gt; 发送时间: 2023年10月8日 6:16 收件人: Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt; 主题: kamailio Behind nat. How Record-Route should be added ？ UA(192.168.0.11) received 183, find Record-Route(36.140.122.12) then send ACK to 36.140.122.12(Kamialio public ip) not 192.168.0.2(kamailio internal ip), so Kamailio can't receive ACK. this is my config，192.168.0.11 -> Kamailio -> Other SBC(public ip) function ksr_request_route()       if KSR.is_INVITE() then             KSR.rr.record_route();             KSR.nathelper.fix_nated_contact()       end end This question has been bothering me for a long time, help me [cid:d1ec74be-1c33-406e-80d5-68663d1cd21f] [cid:bda00d0d-e6e6-4dc9-9462-141ad42b09b8]