[SR-Users] Kamailio: 500 Server error occurred (19/SL).

[Daniel-Constantin Mierla]

Hello,

On 7/19/11 12:10 PM, Max Doronin wrote:
> Hello Daniel,
>
> I think your guess about failure_route is correct. Here is the related 
> piece of config. Actually I can not find any append_branch() call in 
> config (which is not originally developed by me).
>
> failure_route[1] {
>         if (t_was_cancelled()) {
>                 exit;
>         }
>
>         if (t_check_status("408|403|404|488|480|415|50[0-4]")) {
>                 if (next_gw()) {
>                         t_on_failure("1");
>                         route(6);
>                 }
>                 else
>                 {
>                         route(6);
you should not call route(6) in the above line, but rather exit -- there 
was no next gw to try.

Cheers,
Daniel

>                 }
>         }
> }
>
> route[6] {
>         if (!t_relay()) {
>                 sl_reply_error();
>         }
>         exit;
> }
>
> Cheers,
> Max.
>
> On Tue, Jul 19, 2011 at 3:37 PM, Daniel-Constantin Mierla 
> <miconda at gmail.com <mailto:miconda at gmail.com>> wrote:
>
>     Hello,
>
>
>     On 7/13/11 5:51 PM, Max Doronin wrote:
>
>         Hello guys,
>
>         I have strange behavior on my Kamailio-1.5.1-notls instance.
>
>         I have LCR and TM modules enabled.For a particular destination
>         I have
>         4 routes to try. When I call to non-existing number, it tries
>         - route 1 (404 Not Found)
>         - route 2 (404 Not Found)
>         - route 3 (503 Service unavailable)
>
>         And the problem is with the last 503.
>
>         Kamailio ACKs it, immediately drops these 2 lines into syslog
>         Jul 13 04:14:47 /usr/local/sbin/kamailio[23572]:
>         ERROR:tm:t_forward_nonack: no branch for forwarding
>         Jul 13 04:14:47 /usr/local/sbin/kamailio[23572]:
>         ERROR:tm:w_t_relay:
>         t_forward_nonack failed
>         And sends
>         SIP/2.0 500 Server error occurred (19/SL).
>         To the call originator.
>
>         30 microseconds later it sends
>         SIP/2.0 500 Service Unavailable.
>         to the originator again
>
>         Latter 500 looks like the relayed original "503 Service
>         unavailable".
>         I think so because the Reason header is the same:
>         Reason: SIP;cause=503;text="Service
>         Unavailable";icodetext="NoCircuitAvailable";iintcode=10034;isubsystem=3.
>
>         Obviously call is terminated.
>
>         I noticed that that last peer rewrites my Via headers like this:
>         Original:
>         ==
>         Via: SIP/2.0/UDP 187.45.214.132;branch=z9hG4bK3dac.fae9b793.2.
>         Via: SIP/2.0/UDP
>         192.168.2.33:5622;received=49.49.59.23;branch=z9hG4bK-d8754z-a6ba40014f97fb7c-1---d8754z-;rport=23832.
>         ==
>
>         Rewritten
>         ==
>         Via: SIP/2.0/UDP
>         187.45.214.132;received=187.45.214.132;branch=z9hG4bK3dac.fae9b793.2,SIP/2.0/UDP
>         192.168.2.33:5622;received=49.49.59.23;branch=z9hG4b
>         ==
>
>         I tried to modify via1_matching parameter (1 ->  0) but no
>         changes.
>
>         My questions are:
>         - What can be the reason of that 500 with 19/SL
>         - Can kamailio properly handle this 1 line Via header?
>         - What can be the reason of that "t_forward_nonack: no branch
>         for forwarding"?
>
>
>     it seems you try to forward one more time, but there is no new
>     branch where to send. I guess there is some issue in the
>     failure_route, like calling t_relay() even if the new branch is
>     not added. If you can paste it here, I can tell more clear if
>     something is wrong there.
>
>     Cheers,
>     Daniel
>
>     -- 
>     Daniel-Constantin Mierla -- http://www.asipto.com
>     Kamailio Advanced Training, Oct 10-13, Berlin: http://asipto.com/u/kat
>     http://linkedin.com/in/miconda -- http://twitter.com/miconda
>
>
>
>
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-- 
Daniel-Constantin Mierla -- http://www.asipto.com
Kamailio Advanced Training, Oct 10-13, Berlin: http://asipto.com/u/kat
http://linkedin.com/in/miconda -- http://twitter.com/miconda

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