Restrict calls between extensions, custom context module

Hello good afternoon,
Surely at some point this topic was touched, but I do not find presided information to do so.
I need to restrict calls between extensions in principle. I know we have to play with the contexts, but I also found this on the custom module contexthttps: //, it seems a much simpler way to do it. Can someone give me information about this? where the module is obtained and if supported by the FreePBX version
Thank you!

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