How to make lobby phone unable to dial outside world

General Help
1

I have a lobby phone that I would love to be unable to call outside our office. I just want it to be able to dial our 4 digit extensions. Im just not sure how this is done. Can a route be written in such a way to block that extension? Is this something that would need to be done on the phone instead on the PBX? Not sure where to start looking.

2

You can utilize the Extension Routing Module, or Class of Service to implement this functionality.

3

Without the module, create a route with only the 4 digits in the dial plan and put the extension in the Caller ID field. Place that route as the first one.

4

I used an unsupported module called Custom Contexts to define a different context for extensions in public space (that I don’t want users dialling out over a trunk on).

It made life really easy, and better still I defined a rule list of numbers that could be dialled such as emergency 000 and our Technical Support number (which is free call from our SIP trunks).