We need a loudspeaker/paging system in our shop area to work with our 3cx Small Business system. Our old PBX had a speaker system that worked as an extension on the phone system. I am assuming they make something like this to work with an IP-based PBX? Can anyone advise on brands or where I might buy a system, that I know will succesfully work with 3cx? I've been searching on the Internet but can't seem to find exactly what I want.