I have a room full of people who talk through microphones, amplifiers and speakers. I would like to have people in other locations participate, both speaking and listening through their telephones. I can use a conference calling service to connect the many phones together. What I need is a device that I can plug a phone line into (This phone line will be on the conference call) and then plug into the line in and line out connectors on the amplifier. Does such a device exist? I am using a Polycom conference phone with a dedicated microphone and a dedicated speaker to send signals to and from the Polycom. This is a bit awkward. Is there a better way?

-Thanks!

See if JK Audio has what you need. Their inline patch or tap products could run phone audio into a mixer/amp/audio processing rack to do whatever you wanted with it and also inject music, other audio sources, etc. back onto the phone line.