Hi, 1st I’m sorry if I made a stupid question but I’m really new (0 experience) in this VoIP matter…
My question is : is it possible to use FreePBX for intranet call only? (example I currently have 1 local network with IP range 192.168.100.10 - 200 and the call can be made only within those IPs)
If possible, what items that I should prepare for this set up? (I already have PC set for installation & Latest Stable FreePBX ISO)
Thanks for the guidance and help… 
Best Regards,
CH
The short answer is “don’t set up an ITSP and don’t connect your system to it.”
If you are on a purely private network, you’ll need all of the “standard” network services (DNS, NTP, etc.) so that things don’t time out and go wonky, but yeah - one you install the extensions, you’ll be done.
The network is actually connected to the internet but for the Telephone System I only want to use it within local network (in the same subnet)… For the DNS, NTP and other services are available though…
Thanks for the information
Best Regards,
CH