[SR-Users] loose_route() and FQDN

Fri May 7 14:02:10 CEST 2021

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
>>>>>   * 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/
>>>
>>> __________________________________________________________
>>> 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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