Hello,
is the KAMAILIO_FQDN set as local domain for Kamailio (via alias parameter or domain module+register myself)?
Cheers, Daniel
On 07.05.21 11:17, Igor Olhovskiy wrote:
Hello,
I saw there are some topics on this already and carefully walked through all of them, but can't solve following issue.
For a reason I do need that in Record-Route header sent to endpoint would present FQDN. If it matters, it's UDP/WSS conversion done on Kamailio.
So, scheme is quite simple
Enpoint A ->UDP-> Kamailio ->WSS-> Endpoint B (NAT)
Main issue here, that if in Record-Route headers it's FQDN, but not IP addresses, on a new transactions with a dialog (ACK on 200, PRACK, BYE), Kamailio*loose_route()* function resolves address of destination not current dialog, but actual R-URI (or itself, if R-URI is something from WebRTC world) that is not correct due to NAT.
If in RR headers IP addresses are present - all is working as expected.
As an example (RR with FQDN)
B answers 200
SIP/2.0 200 OK Record-Route: sip:KAMAILIO_FQDN:8089;transport=ws;r2=on;lr=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss Record-Route: sip:KAMAILIO_FQDN;r2=on;lr=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss Via: SIP/2.0/UDP <A_IP_ADDRESS>:5060;received=A IP ADDRESS;rport=5060;branch=z9hG4bKPj67fb6d86-97d7-4231-995b-e54b0f62881e To: <sip:88290@<KAMAILIO_FQDN>>;tag=hvra7mj3q0 From: <sip:+XXXX7688881@<KAMAILIO_FQDN>>;tag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d Call-ID: 46f44741-d155-4dd5-8fd8-78e540fc1acb CSeq: 18326 INVITE Contact: sip:88290@toleivu2gdbh.invalid;transport=wss Allow: ACK,CANCEL,INVITE,MESSAGE,BYE,OPTIONS,INFO,NOTIFY,REFER Supported: outbound Content-Type: application/sdp Content-Length: 817
ACK looks like
ACK sip:88290@toleivu2gdbh.invalid;transport=wss SIP/2.0 Via: SIP/2.0/UDP A_IP_ADDRESS:5060;rport;branch=z9hG4bKPj8d05548a-91ef-4332-8617-32f8eeebf8f2 From: sip:88881@A_IP_ADDRESS;tag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d To: sip:88290@KAMAILIO_FQDN;tag=hvra7mj3q0 Call-ID: 46f44741-d155-4dd5-8fd8-78e540fc1acb CSeq: 18326 ACK Route: sip:FQDN;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss Route: sip:FQDN:8089;transport=ws;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss Max-Forwards: 70 User-Agent: Asterisk PBX 13.33.0 Content-Length: 0
And Kamailio on *loose_route()* loops ACK to itself. (with result of function == 1)
In a case if in Record-Route/Route headers just IP address of Kamailio present, all works as expected, but it's not really behavior I want to achieve.
I've tried to play with *record_route_preset("...")* specifying only WSS part (as suggested in https://skalatan.de/de/blog/kamailio-sbc-teams) with FQDN, but no luck.
Also wanted to try approach using record_route_preset() function in branch route, but it was working only with first branch, not affecting others (but I assume having different RR headers across branches is not a good idea)
-- Regards, Igor
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