Block all External Incoming Calls
A way to easily block all external incoming calls but only allow select internal extensions to call extensions.
The idea is to prevent anyone from outside the company from calling the select phone and allow people within the company to call those devices/phones.
The use case for us is we are using Ring Central with Algo Intercom devices and would like to control who can call the intercoms. We do not want any spam calls that can call our intercoms.

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Shawn commented
This is needed for a clean room for drug compounding with a phone set to auto answer, but we do not want external calls to the DID number to be able to call to this private area only employees of the company!
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Kevin commented
Unneeded as this is already built into the system as for intercom there is a whitelist of people that are allowed to use the intercom function.