Voip configuration

  • hi
    i need to configure 3 boxes of pfsense in 3 different geographic locations as follows:
    1- location A have internet users and some can have access to use phone calls
    2- location B same as A
    3- location C same as A
    4 - how is it possible for A, B & C to communicate with each other using the internet?
    i am planing to practice this next week

    help really appreciated

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