Years ago I did a conference room option with ceiling speakers. The caveat was it worked like the listen feature on a Norstar. One guy would talk on the handset and the whole room heard the conversation. If I remember correctly I used an adapter that would bridge the handset to an amplifier or p.c. input (maybe got it from Sandman) then connected to an amp and ceiling speakers. Again the drawback was the outside callers could only hear the guy on the handset.

John 807