Ok, I have a novel way of doing this by just using an old IP phone. I have used this a couple of times (on different systems) but recently used it on a 3300. All you do is program up an IP phone in the paging group and install it next to the audio input for the amplifier. Next you open up the phone, snip the two wires that connect to the speaker in the phone and joint them onto a cable that connects into the audio in on the amp.