[SR-Users] loose_route() and FQDN

Fri May 7 17:32:30 CEST 2021

Have you tried verifying Kamailio actually believes the FQDN is itself?

Regards,

David Villasmil
email: david.villasmil.work at gmail.com
phone: +34669448337

On Fri, May 7, 2021 at 4:18 PM Igor Olhovskiy <igorolhovskiy at gmail.com>
wrote:

> David,
>
> Yes, I did added it, means it was there, but is_first_hop() was blocking
> adding it. I think it's some leftovers from default config.
>
> So, my conclusion, that is_first_hop() is ok with IP addresses, but not ok
> with FQDN in route. Although FQDN is added as alias
>
> Regards,
> Igor
>
> On 07.05.2021 16:07, David Villasmil wrote:
>
> Did you add the handle_ruri_alias() as suggested by Daniel? I had
> something like this where I would get “unable to resolve blah blah blah"
> and it’s because the RURI is the actual wss “address” which is
> unresolvable, so executing the function forces kamailio to take the alias
> instead.
>
>
> On Fri, 7 May 2021 at 13:48, Igor Olhovskiy <igorolhovskiy at gmail.com>
> wrote:
>
>> Daniel,
>>
>> Seems to be it's really the case, but with other function
>>
>> With FQDN in RR
>> is_first_hop()
>>
>> is not acting correctly for reply.
>>
>> For incoming SIP replies, it means that top Record-Route URI is 'myself'
>> and source address is not matching it
>>
>> But in Record-Route we have "myself", but *is_first_hop()* returning 0.
>>
>> Thanks!
>>
>> Regards,
>> Igor
>>
>> On 07.05.2021 14:22, Daniel-Constantin Mierla wrote:
>>
>> OK, because looping was something that should not have happened in this
>> case.
>>
>> Then the problem is that you do not do nat-traversal-like processing for
>> websocket/webrtc traffic. You have to use set_contact_alias() +
>> handle_ruri_alias() because the webrtc endpoints do not set "valid" contact
>> addresses.
>>
>> Cheers,
>> Daniel
>> On 07.05.21 14:13, Igor Olhovskiy wrote:
>>
>> 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
>>
>>
>> __________________________________________________________
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>>
>> --
>> Daniel-Constantin Mierla -- www.asipto.comwww.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.comwww.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.comwww.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.comwww.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
>>
> --
> Regards,
>
> David Villasmil
> email: david.villasmil.work at gmail.com
> phone: +34669448337
>
> __________________________________________________________
> 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
>
> __________________________________________________________
> 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
>
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