Blocking internal extension calling

How can i block internal extension to extension calling but allow incoming and outgoing calls
Example the extension range is 101 to 115 and i want to block calling between each other

Using Vital PBX4

This should help you:

for example:
Scenario 5: Restricting calls by Prefix


If you set an internal restriction rule, such as 1XX, then it blocks incoming calls as well.

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