Can I setup a personal voip system on my lan without using the internet?

i wanna set up VoIP. I know it uses a network. so far I know they all need the internet. but I wanna setup my own network and configure a VoIP server on it. does anyone have any help t offer? I would be very grateful. thanks!
Asked Mar 11, 2014
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Answered Aug 25, 2018

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