[Serusers] Routing Logic Question

[Java Rockx]

Thanks Zeus - that makes sense. I don't know why I didn't think of that :-)

Paul


On Fri, 11 Mar 2005 14:25:05 +1100, Zeus Ng <zeus.ng at isquare.com.au> wrote:
> You should do no more than what you have done.
> 
> The R-URI in CANCEL should be the same as in INVITE. If you can determine
> the call is for PSTN with INVITE, the same logic applies to CANCEL.
> 
> If the R-URI received from CANCEL is different to the one from INVITE, there
> is a problem with that implementation.
> 
> 
> > -----Original Message-----
> > From: serusers-bounces at lists.iptel.org
> > [mailto:serusers-bounces at lists.iptel.org] On Behalf Of Java Rockx
> > Sent: Friday, 11 March 2005 1:24 PM
> > To: serusers at lists.iptel.org
> > Subject: [Serusers] Routing Logic Question
> >
> >
> > Hi All.
> >
> > I'm a confused when handling CANCEL messages when the call is
> > between my SER proxy and a PSTN gateway.
> >
> > I've had a few discussions with Jan regarding when
> > lookup("location") needs to be called and as I understand it
> > CANCEL is sort of an odd message that is not really
> > mid-dialog, and therefore not record-routed. So
> > lookup("location") needs to be called before t_relay()ing a CANCEL.
> >
> > This is fine for calls between two UAs on the same SER proxy
> > since both UAs have a contact record and lookup("location")
> > will return TRUE.
> >
> > But when calling SIP->PSTN, and you hang up from the SIP
> > side, the CANCEL is sent from the SIP UA to SER. Then SER
> > tries to find the contact record in the location table, but
> > since this is a PSTN destination, lookup(location) returns
> > false, thus a 404 and the CANCEL is not relayed to the PSTN gateway.
> >
> > So what is the best way to process CANCEL messages? Just ignore
> > lookup("location") when it returns false for CANCEL messages?
> >
> > My basic ser.cfg is like this:
> >
> > route {
> >     # sanity checks
> >     if (method!="REGISTER") record_route();
> >     if (loose_route()) {
> >         t_relay();
> >         break;
> >     };
> >
> >     if (uri!=myself) {
> >         t_relay();
> >         break;
> >     };
> >
> >     if (uri==myself) {
> >          if (method=="REGISTER") {
> >              save("location");
> >              break;
> >          };
> >          if (!lookup("location")) {
> >              sl_send_reply("404", "Not Found");
> >              break;
> >          };
> >      };
> >      t_relay();
> > }
> >
> > Regards,
> > Paul
> >
> > _______________________________________________
> > Serusers mailing list
> > serusers at lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers
> >
> 
>