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

[Bogdan-Andrei Iancu]

Hi Alex,

That is correct, but I was interested to see the logs to see why the 
parallel processing of CANCEL and INVITE leads to an 500....it would 
rather be a local 487 cancelled....But I need the logs to see how the 
processing takes place.

Regards,
Bogdan

Alex Massover wrote:
> 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
>>>     >
>>>     >
>>>