How to block extension to extension calls in freepbx distro?

I’m new to the pbx world, I need to block estension range 100-119 so they can not be able to call extension range 120-129… please help. Thank you in advance.

Custom Contexts are the only way i know. I just used this to sort of “multi tenant” a system.
Someone helped me with this last week but i cannot find right now.

It’s in the unsupported modules repository.

Thanks… I installed custom contexts but as Isaid… I’m new to the pbx world can somebody give some instructions of how I can configure it… Ireally need to do that but I don’t know how to do it… and Idont find any info about it on the internet.