OK, I know they sell SIP overhead paging modules, but they want too much money for them because it's a specialized device that caters to business needs. I also know that you can buy phones that will answer all incoming calls automatically and uses the headset jack to supply audio to an amplifier. Some people use this method but not all phones have this feature. However, for ~$4.00 and a trip to Radio Shack, you can convert just about any SIP phone that has a speaker phone into a overhead paging module. Here's how: I used a spare SPA942. This phone is nice to modify because it's inexpensive, has POE and is easy to take apart. Open up the phone to expose the insides. Here's the ~$4.00 3.5mm audio jack you need from Radio Shack. It disconnects the audio to the speaker when something is plugged into it. Using a soldering iron unsolder the wires going to the speaker. Solder the speaker wire to the input of the plug and solder a length of extra wire from the output to the speaker. I drilled a hole in the bottom of the case and used a bit of hot glue to secure the plug. An there you have it, a phone that you can connect to any amplifier using a mini y-adapter. Simply set the phone up as an extension and assign it to a paging group. Use the volume adjustment on the phone to increase/decrease the output levels.