[SR-Users] loose_route() and FQDN

[Daniel-Constantin Mierla]

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 at 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 at 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 at A_IP_ADDRESS>;tag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d
> To: <sip:88290 at 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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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - Online
May 17-20, 2021 (Europe Timezone) - June 7-10, 2021 (America Timezone)
  * https://www.asipto.com/sw/kamailio-advanced-training-online/

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