VoIP would probably be OK, but we're working with a limited budget. The server being the expense they don't want to incur.

If there's a way to convert to VoIP and then back reliably without a server, I'm all over that.

I thought about the power line modulators, but they're not getting their power from the same source. It's a totally separate line coming straight from the pole. It just happened to be close enough to the main building to run fiber through it as well.