From mkaganer@gmail.com Tue Jun 17 12:57:25 2014
From: Mordechay Kaganer <mkaganer@gmail.com>
To: sr-users@lists.kamailio.org
Subject: Re: [SR-Users] Problem with CANCEL handling
Date: Tue, 17 Jun 2014 13:57:19 +0300
Message-ID:
 <CA+xOVSP9LMSSCyamLqUoA7RYL_U83irnwEZZVKT8HiTa4iv+cA@mail.gmail.com>
In-Reply-To:
 <CA+xOVSPBh_cP-hX0ujSnrxSU7a3cktPNBaVeUPOcWH6Y3On7Mg@mail.gmail.com>
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B.H.

On Mon, Jun 16, 2014 at 5:38 PM, Mordechay Kaganer <mkaganer(a)gmail.com>
wrote:

> B.H.
>
> Hello, all!
>
> I'm trying to set up kamailio as a simple load balancer proxy between PSTN
> gateway and a cluster of asterisk servers - rather common use case IMHO.
> I'm completely new to kamailio.
>
> I have started with the default kamailio.cfg that comes with Ubuntu
> package and added the dispatcher module as described in the docs (
> http://www.kamailio.org/docs/modules/4.0.x/modules/dispatcher.html).
>
> At the end, i got this up and running, but with one exception: if incoming
> call is not answered by the asterisk end (i.e. it is in ringing state), and
> then the gateway sends CANCEL request, kamailio is unable to recognize the
> transaction and is not forwarding the request to asterisk. The result is:
> the call is left "dangling" in the PBX and is not properly hang up.
>
> When the gateway sends CANCEL to kamailio, i get the following log
> messages:
>  4(25442) DEBUG: tm [t_lookup.c:769]: t_lookupOriginalT(): DEBUG:
> t_lookupOriginalT: searching on hash entry 31287
>  4(25442) DEBUG: tm [t_lookup.c:492]: matching_3261(): DEBUG: RFC3261
> transaction matching failed
>  4(25442) DEBUG: tm [t_lookup.c:859]: t_lookupOriginalT(): DEBUG:
> t_lookupOriginalT: no CANCEL matching found!
>  4(25442) DEBUG: tm [t_lookup.c:861]: t_lookupOriginalT(): DEBUG:
> t_lookupOriginalT completed
>  4(25442) DEBUG: tm [tm.c:1039]: w_t_lookup_cancel(): lookup_original:
> t_lookupOriginalT returned: (nil)
>  4(25442) ERROR: *** cfgtrace: c=3D[/etc/kamailio/kamailio.cfg] l=3D485 a=
=3D25
> n=3Dxdbg
>  4(25442) DEBUG: <script>: is_method(CANCEL): t_check_trans()=3D=3Dfalse
> 4(25442) ERROR: *** cfgtrace: c=3D[/etc/kamailio/kamailio.cfg] l=3D487 a=3D2
> n=3Dexit
>
> The relevant script snippet is standard from the distro package:
>         # CANCEL processing
>         if (is_method("CANCEL"))
>         {
>                 xdbg("is_method(CANCEL): entry");
>                 if (t_check_trans()) {
>                         xdbg("is_method(CANCEL): t_check_trans()=3D=3Dtrue"=
);
>                         route(RELAY);
>                 } else {
>                         xdbg("is_method(CANCEL): t_check_trans()=3D=3Dfalse=
");
>                 }
>                 exit;
>         }
>
> How can i fix this?
>

Finally, i have found the source of the problem:

route[DISPATCH] {
        if(!ds_select_domain("1", "5"))
        {
                send_reply("404", "No destination");
                exit;
        }
        xlog("L_NOTICE", "--- DISPATCH: going to <$ru> via <$du>\n");
#        forward();
#        exit();
        route(RELAY);
}

By advice from some blog, i have put only forward(); exit(); instead of
route(RELAY). This broke the transaction tracking.
With route(RELAY) everything works perfectly.


>
> Thanks!
>
> --
> =D7=9E=D7=A9=D7=99=D7=97 NOW!
> Moshiach is coming very soon, prepare yourself!
> =D7=99=D7=97=D7=99 =D7=90=D7=93=D7=95=D7=A0=D7=A0=D7=95 =D7=9E=D7=95=D7=A8=
=D7=99=D7=A0=D7=95 =D7=95=D7=A8=D7=91=D7=99=D7=A0=D7=95 =D7=9E=D7=9C=D7=9A =
=D7=94=D7=9E=D7=A9=D7=99=D7=97 =D7=9C=D7=A2=D7=95=D7=9C=D7=9D =D7=95=D7=A2=D7=
=93!
>



--=20
=D7=9E=D7=A9=D7=99=D7=97 NOW!
Moshiach is coming very soon, prepare yourself!
=D7=99=D7=97=D7=99 =D7=90=D7=93=D7=95=D7=A0=D7=A0=D7=95 =D7=9E=D7=95=D7=A8=D7=
=99=D7=A0=D7=95 =D7=95=D7=A8=D7=91=D7=99=D7=A0=D7=95 =D7=9E=D7=9C=D7=9A =D7=
=94=D7=9E=D7=A9=D7=99=D7=97 =D7=9C=D7=A2=D7=95=D7=9C=D7=9D =D7=95=D7=A2=D7=93!



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