[SR-Users] loose_route() and FQDN

[Igor Olhovskiy]

Daniel,

Yes, it is.

alias=...

Also tried with

listen = IP advertise FQDN

same behavior, loose_route() stops acting correctly.

PS: Forgot to add, Kamailio 5.4.3 / 5.4.4

Regards,
Igor

On 07.05.2021 13:21, Daniel-Constantin Mierla wrote:
>
> 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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