A school recently contacted me about helping them setup a new PA system in the school as theirs died and they can no longer get any parts for it. They want to know (as do I) if they can use their existing CAT 5 cables that were recently installed and setup some sort of PA system using voice over IP? They also ideally would like to get the school's bell system on this as well so that the bells will ring at certain times throughout the day to dismiss the students. I know this is not really security related, but I was hopig someone on here (being that I really trust the opinions of those on here) to let me know if its even possible, what types of equipment would be needed and so forth.