Re: [SR-Users] Kamailio : Listening on multiple ports behind NAT

After endless tests, I tried to replace record_route_preset with insert_hf, writing the complete record route headers. A light started to come out of the tunnel..... Suppose User A is registered to port 53, User B to port 5060. In the case of double record route, when A sends an INVITE to B, I write the following in the SIP header of the INVITE forwarded to B : Record-Route: <sip:public_ip:5060;r2=on;lr=on> Record-Route: <sip:public_ip:53;r2=on;lr=on> The first transaction, INVITE / 200OK goes well, with Kamailio forwarding packets correctly from the corresponding socket of each user. The problem arises when User B sends BYE to the 5060 port, with both route headers in the SIP header of the BYE. I get the following error :     WARNING: rr [loose.c:747]: no socket found for match second RR after which Kamailio forwards the BYE from the 5060 socket to User A. User A being registered on port 53, ignores the packet coming with source port 5060. The BYE is never replied to. I guess that means that Kamailio is not able to find the private_ip:53 socket from the public_ip:53 record-route header. I hope it was clear.

I think there's a fundamental issue with running Kamailio behind NAT and listening on multiple port numbers. Am I the only one suffering from this type of configuration? (Part of the problem is also tied to dumb ALG NAT routers which try to out-smart SIP servers, without which I wouldn't run Kamailio on multiple ports, and life would be much easier)