The best bet would be to use the TRoute statement. Additionally, you might want to see that the external number that you are trying to route the call to is actually permissioned on the PBX(Otherwise, you might just hear a setbusy tone). Hope this helps.
I’ve been advised by an few engineers that it is not possible to TRoute calls to external PSTN numbers - I find this a bit weird.
Can someone confirm this?
We have a CUCM-Genesys environment with the correct CUCM config for the RP (i.e. CSS, Route Partitions, etc) - I’ve tried TRoute-ing to external PSTN (i.e. TRoute[varRP,‘’,RouteTypeDefault,‘’]) - however it just returns a busy signal ???