Restrict extension to intern and local calls


I want to ask if it is possible to restrict extension from calling to international numbers?
If yes, how?
I have seen that the module class of service can be used. But this has to be bought. I want to use a module or way which is free.

outbound routes

is your solution

But how? should the extensions be placed where is written caller ID in the tab of dial pattern?

no, outbound routes are global, what are yours?

Hey, mine is not global. Can you tell me in more details maybe what i should do?
I mean where exaxtly in the outbound route should i configure that

what do have right now?

Hi ia m sending you some screenshots, i hope with this you can have an idea what i have configured:

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