[SR-Users] loose_route() and FQDN

Fri May 7 14:13:29 CEST 2021

Ah, no, sorry, I was wrong at this one,

This just is not sent with "unable to resolve address 
toleivu2gdbh.invalid".

Sorry. Looping were something else during my tests, this just with 
*advertise* added

Regards,
Igor

On 07.05.2021 14:02, Daniel-Constantin Mierla wrote:
>
> This looks like incoming ACK, because there is only one Via header, so 
> it is not what proxy forwards -- that one is relevant to see what 
> headers were consumed and added.
>
> Cheers,
> Daniel
>
> On 07.05.21 13:51, Igor Olhovskiy wrote:
>> Sure.
>>
>> 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:KAMAILIO_FQDN;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss>
>> Route: 
>> <sip:KAMAILIO_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
>>
>>
>> By loop I meant, Kamailio just relaying it back to self and discard.
>>
>> Regards,
>> Igor
>> On 07.05.2021 13:48, Daniel-Constantin Mierla wrote:
>>>
>>> Can you paste the ACK that loops, after being handled once by Kamailio?
>>>
>>> Cheers,
>>> Daniel
>>>
>>> On 07.05.21 13:25, Igor Olhovskiy wrote:
>>>>
>>>> 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
>>>>>>
>>>>>> __________________________________________________________
>>>>>> Kamailio - Users Mailing List - Non Commercial Discussions
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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/
>>>>
>>>> __________________________________________________________
>>>> Kamailio - Users Mailing List - Non Commercial Discussions
>>>>    *sr-users at lists.kamailio.org
>>>> Important: keep the mailing list in the recipients, do not reply only to the sender!
>>>> Edit mailing list options or unsubscribe:
>>>>    *https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>> -- 
>>> 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/
> -- 
> 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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