I have a call manager express with 44 extensions. Half of them have extensions that start with 66XX and the other half have 61XX.
Right now all extensions are able to receive incoming and make outgoing calls to the outside world (PSTN network). I just want to limit this feature to the extensions 66XX and block all extensions 61XX from making these calls (just internal calls allowed with the CME). How to do that, is there any idea?