To mimplement overhead paging you need to interface your PBX to the paging amplifier. The easiest way without a lot of programming is to get a Station Level Paging Adapter from Valcom. That hooks up to an analog extension and your paging amplifier. When you dial the extension you hear a tone and you can begin speaking. Next in line is to interface a trunk port to your paging amplifier, which usually requires programming to create the trunk,turnk group, access code, routing, etc. Then you connect your trunk to a zone page adapter (Gordon Kapes, Interalia, Valcom) and connect that to your paging amplifier, or if you have one of the Bogen TPA series you might be able to hook that directly to the trunk. Most paging amplifiers want a 600 ohm input if I remember correctly. You would definitely need help with the second method. I have several buildings with paging, but I set all that up at least 10 years ago, and when we upgraded in 2014 the vendor handled all the new trunking setup.
Don Bruechert, Voice Comm Analyst II
CareTech Solutions @ Holy Family Memorial
Manitowoc, WI, USA