We have two separate telex system for both of our theatres. Both theatres unfortunately have to share the green room and dressing room. We want to put wall mounted comms speaker for both the green room and all dressing rooms that works with both telex systems. Is there a way to connect the comms speakers to both systems and be able to switch between both telex systems. Maybe one that comes with two channels or something each channel that can talk/listen to each telex system individually but can switch between the both when needed