Newbie here... I am looking to upgrade/replace our existing church phone system with VOIP, but I am wondering how it will work with our current setup. We have two PSTN lines coming into the building. They drop into one closet where they connect into the old POTS lines running all over the building. An alarm system dials out through line 1, I believe. Our AT&T U-Verse for Business service comes in on line 2. So if we dropped our existing PSTN completely, would this have any affect on our alarm system? I assume the answer would be "no" because we could route it through the VOIP gateway, but I'm not quite sure. Also, how would this affect our internet? We recently switched from cable to AT&T, which is apparently not the same as DSL, but it still comes from their fiber network down the regular phone line. I would hate to have to go through switching our service again. Any ideas? Thanks.