Restrict inbound calls to an extension - used for Door Lock Release

Current PBX Version:
Current System Version:12.7.6-1904-1.sng7

Installing a Viking analog 3 relay module on a Vega analog FXS port. This will provide multiple door lock release for the Purchasing and HR departments.
I need to be able to restrict access to this extension to only allow calls from certain extensions.
What would be best practice?

Unfortunately, with Class of Service you cannot restrict extension to extension, so you’ll need to setup a custom dialplan.

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