Re: about sip message

TM does not send a reply automatically.  It will relay a received failure automatically, but if your config looks like this:


request_route {
    t_newtran();
    exit;
}

There will be no reply sent, and Kamailio will log this:

10(16) WARNING: [54a0809b-23b2-4448-8f72-63867c6b0ecf INVITE-154400 <null>] tm [t_lookup.c:2060]: t_unref(): script writer didn't release transaction


In addition to the suggestion of adding more log lines (which is a solid idea, especially if they’re at dbg level), I often find it’s helpful to create as simple an example as possible (like my example above) to check the behavior.


Regards,
Kaufman

From: James Browne via sr-users <[email protected]>
Date: Wednesday, March 25, 2026 at 12:00 PM
To: Kamailio (SER) - Users Mailing List <[email protected]>
Cc: James Browne <[email protected]>
Subject: [SR-Users] Re: about sip message

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On Wed, 25 Mar 2026 at 11:11, Richard Robson via sr-users
<[email protected]> wrote:
>
> Are you handling the MESSAGE explicitly?
>
> It sounds like you are falling through the script without doing anything
> and the core is returning 500 No error by the SL module because there is
> no transaction.

I'm not sure about that, because the default script behavior is to do
nothing. My understanding is that if there's a transaction, then TM
will send a final response if the script does not, but SL won't get
involved like that.

>
> the best way to find out what is occurring it follow the logs or
> manually step through the script and seeing what the logic will do with
> a MESSAGE method.
>

I agree with this; that's how I always do it: add logs at many places
and eventually find the exact line of code that leads to the error
(and _then_ figure out why).

James

>
> Regards,
>
>
> Richard
>
> On 19/03/2026 10:21, zhaobin via sr-users wrote:
> > I try send sip message from freeswitch to webrtc sip client,then
> > kamailio send back 500 error.
> >
> > I have some question about this:
> > 1:image show kamailio sl module send this error.Why sip message is
> > trans by sl module,not tm module?
> > 2:about error show (2/SL),i know SL is sl module,and 2 is what?
> > 3:so i must get debug log to get more infomations about this error?
> >
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Important: keep the mailing list in the recipients, do not reply only to the sender!