[OpenSIPS-Users] ERROR:tm:t_forward_nonack: discarding fwd for a cancelled/6xx transaction

[Alex Massover]

Hi!

I think we experienced something similar, as far as I remember the following fixes the issue in conjunction with the code below that Bogdan suggested:

For INVITE you do:

        t_newtran();
        t_reply("100","Trying");
....
....
        if(!t_relay("0x05"))
        {
                #sl_reply_error(); # do not send error
        }

The idea is to create transaction as fast as possible, and do not reply if t_relay() fails.

For CANCEL you do, like Bogdan said:

        if (is_method("CANCEL"))
{
        if (t_check_trans())
                t_relay();
        exit;
}

You get an error in log, but 500 is not sent. As far as I remember, there was no way to fix it more cleanly.

The situation can be easy reproduced if you "slow down" processing of INVITE and then send CANCEL, for example with exec_dset("very_slow_script").


--
Best Regards,
Alex Massover
VoIP R&D TL
Jajah Inc.
> -----Original Message-----
> From: users-bounces at lists.opensips.org [mailto:users-
> bounces at lists.opensips.org] On Behalf Of Bogdan-Andrei Iancu
> Sent: Tuesday, October 13, 2009 4:17 PM
> To: OpenSIPS users mailling list
> Subject: Re: [OpenSIPS-Users] ERROR:tm:t_forward_nonack: discarding fwd
> for a cancelled/6xx transaction
>
> Hi Krunal,
>
> could you send me (off list if necessary) a trace of the call and the
> output of opensips in debug mode 6 ?
>
> Regards,
> Bogdan
>
> Krunal Patel wrote:
> > Hello Bogdan,
> >
> > I have your suggested code block , in my cfg.
> > But still getting the same.
> >
> > --
> > Krunal Patel
> >
> > On Mon, Oct 12, 2009 at 9:04 PM, Bogdan-Andrei Iancu
> > <bogdan at voice-system.ro <mailto:bogdan at voice-system.ro>> wrote:
> >
> >     Hi Krunal,
> >
> >     Looks like a race between the INVITE and CANCEL.....typical way
> to
> >     deal
> >     with that is by processing the CANCEL only if it matches an
> INVITE
> >     transaction:
> >
> >        # CANCEL processing
> >        if (is_method("CANCEL"))
> >        {
> >            if (t_check_trans())
> >                t_relay();
> >            exit;
> >        }
> >
> >
> >
> >     do you have this in your script ?
> >
> >     Regards,
> >     Bogdan
> >
> >     Krunal Patel wrote:
> >     > Hi,
> >     >
> >     > I am getting issue like :
> >     > ERROR:tm:t_forward_nonack: discarding fwd for a cancelled/6xx
> >     transaction
> >     >
> >     > Here is the SIP trace.
> >     >
> >     > U 2009/10/12 11:24:19.127160 XXX.XXX.XXX.XXX:5060 ->
> >     YYY.YYY.YYY.YYY:5060
> >     > INVITE sip:[EMAIL PROTECTED] SIP/2.0.
> >     >
> >     > U 2009/10/12 11:24:19.127237 XXX.XXX.XXX.XXX:5060 ->
> >     YYY.YYY.YYY.YYY:5060
> >     > CANCEL sip:[EMAIL PROTECTED] SIP/2.0.
> >     >
> >     > U 2009/10/12 11:24:19.127276 YYY.YYY.YYY.YYY:5060 ->
> >     XXX.XXX.XXX.XXX:5060
> >     > SIP/2.0 100 ci Trying...
> >     >
> >     > U 2009/10/12 11:24:19.130913 YYY.YYY.YYY.YYY:5060 ->
> >     XXX.XXX.XXX.XXX:5060
> >     > SIP/2.0 200 canceling.
> >     >
> >     > U 2009/10/12 11:24:19.142229 YYY.YYY.YYY.YYY:5060 ->
> >     XXX.XXX.XXX.XXX:5060
> >     > SIP/2.0 500 Server error occurred (19/SL).
> >     >
> >     > U 2009/10/12 11:24:19.182452 XXX.XXX.XXX.XXX:5060 ->
> >     YYY.YYY.YYY.YYY:5060
> >     > ACK sip:[EMAIL PROTECTED] SIP/2.0.
> >     >
> >     > This happens when OpenSIPS gets CANCEL from caller before it
> >     sends 100
> >     > Trying to CALLER for the INVITE.
> >     >
> >     > Please let me know how to resolve it.
> >     >
> >     > I have put t_was_cancelled in onreply & failure route both.
> >     >
> >     > Thanks in advance,
> >     >
> >     > --
> >     > Krunal Patel
> >     >
> >     >
> >     >
> >     -----------------------------------------------------------------
> -------
> >     >
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> >     >
> >
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