[Spce-user] unset_dlg when CANCEL Method received

Klaus Peter v. Friedeburg friedeburg at aco.de
Wed Nov 14 09:01:57 EST 2012

Hi Jon,
yes it isn't a bug in ngcp ;-) more a feature request to the kamailio-team. 
I think we can close this case

          Klaus Peter

> -----Ursprüngliche Nachricht-----
> Von: Jon Bonilla (Manwe) [mailto:jbonilla at sipwise.com]
> Gesendet: Mittwoch, 14. November 2012 14:53
> An: spce-user at lists.sipwise.com
> Cc: Klaus Peter v. Friedeburg
> Betreff: Re: [Spce-user] unset_dlg when CANCEL Method received
> El Wed, 14 Nov 2012 13:05:37 +0100
> "Klaus Peter v. Friedeburg" <friedeburg at aco.de> escribió:
> > Hi Jon,
> >
> > well when 487 received the dialog is destroyed! But when no negative response
> > received from what reason for ever the dialog will be active for 12 hours.
> > I´It is possible that the following scenario occurs: Client send an INVITE
> > Kamailio received and processed the INVITE and create the dialog
> > Before any response is reaching the kamailio, the client send an CANCEL
> > Kamailio received and processes the CANCEL but don’t get any response (the
> > sbc down for example) The result is an "hanging" dialog
> >
> > Unset_dlg() is not a solution because a call to this function in a REQUEST
> > ROUTE is not allowed, so that we are not able to destroy the dialog when an
> > CANCEL is received. I think it is a good idea to destroy the dialog when
> > CANCEL received. I think that then the "5 second problem" is fixed. It is
> > possible that you can discuss this on the kamailio-mailing-list?
> >
> Well, the "5 second problem" as you name it is nothing we can do about it. It's
> there to handle retransmissions. And it will happen whith every destroyed
> dialog.
> In case you don't get the negative response because the sbc is down, the
> running dialogs won't be your biggest problem. The system will stop working at
> all!
> I can talk to a couple of guys there but the main developer left the Kamailio
> project last year and the module in kamailio 3.3 is mantained by Daniel Mierla.
> Will try with him. But we won't treat this as a bug.
> cheers,
> Jon

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