[OpenSIPS-Users] CANCELing transactions while perl_exec() running

[Bogdan-Andrei Iancu]

Hi Alex,

Not sure where the problem is. if your script is still running, it means 
your opensips hasn't yet sent any INVITE out, so nothing is to be 
cancelled - so the received CANCELs are dropped.
Once the INVITE is sent out, the transaction exists and t_check_trans() 
will return true for the CANCEL, so the CANCEL will be sent out to the 
same destination as INVITE.

Regards,
Bogdan

Alex Massover wrote:
>
> Hi!
>
> Here's my logic:
>
> […]
>
> if(is_method("INVITE"))
>
> { if(perl_exec("call_backend")) { …..
>
> […]
>
> if(is_method("CANCEL")) {
>
> if(t_check_trans())
>
> {
>
> if(!t_relay())
>
> {
>
> sl_reply_error();
>
> }
>
> }
>
> exit;
>
> }
>
> The purpose of perl_exec("call_backend") is to authenticate each call, 
> before the call is routed to destination.
>
> I have a following problem - when UAC sends CANCEL while perl_exec is 
> still running. In this case t_check_trans() returns false, and CANCEL 
> is silently dropped, so UAC retransmits CANCEL until timer fires.
>
> I wonder how I can correctly process CANCEL for transaction while 
> perl_exec is still running?
>
> AFAIU, if I just reply with 200 to CANCEL it's not good, because the 
> when perl_exec exits the transactions will be continued. And if I 
> remove t_check_trans() it also will make no good.
>
> Probably I need to reply with 200 but really stop this transaction 
> from been continued after perl_exec, but I can't figure out how to do it.
>
> --
>
> Best Regards,
>
> Alex Massover
>
>
>
>
>
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