From kamailio@marrold.co.uk Thu Mar 11 10:55:59 2021
From: Marrold <kamailio@marrold.co.uk>
To: sr-users@lists.kamailio.org
Subject: Re: [SR-Users] Setting $conid per branch
Date: Thu, 11 Mar 2021 09:55:42 +0000
Message-ID:
 <CAC-Lcd8Gj9Mk-GB6BRYASReZ_LfjJLqSUgL2DfqiVo42=6d4bg@mail.gmail.com>
In-Reply-To: <2b3b7626-64a0-a117-249e-5e60643d9300@gmail.com>
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Hi Daniel,

I didn't spot those TCPOPs functions, I'll give them a try and let you know
how I get on.

Do you have any idea why Kamailio is intermittently selecting the wrong
connection using ID vs peer address?

Thanks for the suggestions.
Matthew

On Wed, Mar 10, 2021 at 7:27 AM Daniel-Constantin Mierla <miconda(a)gmail.com>
wrote:

> Hello,
>
> a while ago I did some work to make possible to specify the outgoing tcp
> connection id, see:
>
>   *
> https://www.kamailio.org/docs/modules/stable/modules/tcpops.html#tcpops.f.t=
cp_set_otcpid
>
> And the next function after it.
>
> However, the testing was minimal, maybe not verifying the entire chain
> with t_relay()/forward(). Even more, the specifying of the outbound tcp
> connection was supposed to be done internally by the lookup("location"),
> the functions from tcpops being added for more config flexibility, suitable
> for single branch forwarding or branch_route blocks.
>
> However, in your seem to do manual processing with reg_fetch_contacts(),
> not rely on lookup location. You can test with master and use $sbranch(...)
> and corresponding functions from pv module, instead of setting the r-uri
> and append_branch().
>
> Cheers,
> Daniel
> On 10.03.21 06:00, Marrold wrote:
>
> Hi,
>
> I've done a bit more digging and realised that $conid is read-only, and
> only available for an inbound connection - so I dont think it will achieve
> what I need.
>
> I did a bit more troubleshooting and observed the differences in the debug
> log between two identical calls:
>
> This example failed - the INVITEs went out to the incorrect endpoint / TCP
> connection. The "ulc_conid" from the location table for the TCP endpoint is
> 13:
>
> Mar  9 10:30:20 proxy-01 /sbin/kamailio[27014]: ERROR: <script>: Adding to
> main branch. ua: Yealink SIP-T42G 29.83.0.120 ru:
> sip:442079460000(a)10.0.130.218:5060 du: sip:203.0.113.1:1046 ulc_conid: 0
> flags: 192 ci: 162e3e84-4036-48d7-a1d1-79cc92b7cea4-2-1(a)sip-server-01
> Mar  9 10:30:20 proxy-01 /sbin/kamailio[27014]: ERROR: <script>: Adding to
> child branch. ua: Yealink SIP-T58 58.85.0.5 ru:
> sip:442079460000(a)10.0.130.241:50130;transport=3DTCP du:
> sip:203.0.113.1:50130;transport=3Dtcp ulc_conid: 13  flags: 192 ci:
> 162e3e84-4036-48d7-a1d1-79cc92b7cea4-2-1(a)sip-server-01
>
> The debug log shows the wrong connection was found *by id, *which in this
> case was 2, but should have been 13:
>
> Mar  9 10:30:21 proxy-01 /sbin/kamailio[27014]: INFO: <script>: ONSEND:
> rm: INVITE ru: sip:442079460000(a)10.0.130.218:5060 du: sip:203.0.113.1:1046
> proto: udp src: 185.28.212.61:5060 dest: 203.0.113.1:1046 ci:
> 162e3e84-4036-48d7-a1d1-79cc92b7cea4-2-1(a)sip-server-01
> Mar  9 10:30:21 proxy-01 /sbin/kamailio[27014]: INFO: <script>: ONSEND:
> rm: INVITE ru: sip:442079460000(a)10.0.130.218:5060 du: sip:203.0.113.1:1046
> proto: tcp src: 185.28.212.61:5062 dest: 203.0.113.1:50130 ci:
> 162e3e84-4036-48d7-a1d1-79cc92b7cea4-2-1(a)sip-server-01
> Mar  9 10:30:21 proxy-01 /sbin/kamailio[27014]: DEBUG: <core>
> [core/tcp_main.c:1651]: _tcpconn_find(): found connection by id: 2
> Mar  9 10:30:21 proxy-01 /sbin/kamailio[27014]: DEBUG: <core>
> [core/tcp_main.c:2545]: tcpconn_send_put(): found fd in cache (5,
> 0x7fedc49d2448, 2)
>
> This example worked - the INVITEs went out to the correct endpoints / TCP
> connections. The "ulc_conid" from the location table for the TCP endpoint
> is still 13:
>
> Mar  9 10:42:30 proxy-01 /sbin/kamailio[27016]: ERROR: <script>: Adding to
> main branch. ua: Yealink SIP-T42G 29.83.0.120 ru:
> sip:442079460000(a)10.0.130.218:5060 du: sip:203.0.113.1:1046 ulc_conid: 0
> flags: 192 ci: 95ba0691-bdfc-4293-b99d-d46946cb5180-2-1(a)sip-server-01
> Mar  9 10:42:30 proxy-01 /sbin/kamailio[27016]: ERROR: <script>: Adding to
> child branch. ua: Yealink SIP-T58 58.85.0.5 ru:
> sip:442079460000(a)10.0.130.241:50130;transport=3DTCP du:
> sip:203.0.113.1:50130;transport=3Dtcp ulc_conid: 13 flags: 192 ci:
> 95ba0691-bdfc-4293-b99d-d46946cb5180-2-1(a)sip-server-01
>
> The debug log shows the correct connection was found *by peer address *and
> determined the correct connection 13:
>
> Mar  9 10:42:31 proxy-01 /sbin/kamailio[27016]: INFO: <script>: ONSEND:
> rm: INVITE ru: sip:442079460000(a)10.0.130.218:5060 du: sip:203.0.113.1:1046
> proto: udp src: 185.28.212.61:5060 dest: 203.0.113.1:1046 conid: <null>
> ci: 95ba0691-bdfc-4293-b99d-d46946cb5180-2-1(a)sip-server-01
> Mar  9 10:42:31 proxy-01 /sbin/kamailio[27016]: INFO: <script>: ONSEND:
> rm: INVITE ru: sip:442079460000(a)10.0.130.218:5060 du: sip:203.0.113.1:1046
> proto: tcp src: 185.28.212.61:5062 dest: 203.0.113.1:50130 conid: <null>
> ci: 95ba0691-bdfc-4293-b99d-d46946cb5180-2-1(a)sip-server-01
> Mar  9 10:42:31 proxy-01 /sbin/kamailio[27016]: DEBUG: <core>
> [core/tcp_main.c:1670]: _tcpconn_find(): found connection by peer address
> (id: 13)
> Mar  9 10:42:31 proxy-01 /sbin/kamailio[27016]: DEBUG: <core>
> [core/tcp_main.c:2548]: tcpconn_send_put(): tcp connection found
> (0x7fedc49ce0e8), acquiring fd
>
> Additionally I checked the connection IDs and IPs / Ports before a failed
> and working call and they had not changed, it was the same TCP connection -
> so it doesn't appear to be some interaction with a connection closing or
> changing. We also don't see this issue using the standard lookup()
> function.
>
> Does anyone know why Kamailio is intermittently switching between finding
> by peer address and id, and why it's using the wrong ID?
>
> Thanks again
> Matthew
>
>
> On Tue, Mar 9, 2021 at 8:56 AM Marrold <kamailio(a)marrold.co.uk> wrote:
>
>> Hi all,
>>
>> I'm currently adding a feature to our Kamailio configuration to fork
>> calls based on user agent.
>>
>> To do so I'm getting the registered endpoints with reg_fetch_contacts()
>> iterating through and matching on them, then using seturi() /
>> append_branch() and setting the dst-uri and flags as required.
>>
>> However, calls are intermittently going to the wrong TCP connection,
>> despite the logs showing the correct destination IP and port in the ONSEND
>> route.
>>
>> Looking in the location table I can see each registration has a
>> connection_id, and the debug log indicates it's finding the connection by
>> ID:
>>
>>  DEBUG: <core> [core/tcp_main.c:1651]: _tcpconn_find(): found connection
>> by id: 3
>>
>> Is there a way to set the conid per branch? Is it necessary?
>>
>> We're using kamailio 5.3.3 on Debian 10.
>>
>> Thanks
>> Matthew
>>
>
> _______________________________________________
> Kamailio (SER) - Users Mailing Listsr-users(a)lists.kamailio.orghttps://lis=
ts.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
> --
> Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.li=
nkedin.com/in/miconda
> Funding: https://www.paypal.me/dcmierla
>
>



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--===============1894188933==--