Call Barring is a great feature to help you manage where your employees are calling. With call barring, you can select specific geographical regions or specific countries where you would like to disable outbound calling.
Blocking Outbound Calling to Specific Countries
First, select the number you would like to enable call barring from the home page.
Make sure the feature is enabled in the phone line profile.
Go to the call barring tab and click on the region you would like to block outbound calls.
Click on the “+” sign on the desired region.
A list of countries within that region should expand.
Select all or choose the specific destinations (countries) you would like to block and click "Save".