- Integrate your public address system with nearly any phone system- Cut out background music during paging- Electronic night bell from ringing line or contact closure- Floating 600 ohm output- Selectable 22V DC talk battery for interfacing with unused phone system line input/trunk ports- Paging port interface- Ringing analog line input for night bell- Contact closure input for night bell- DPDT normally open and normally closed VOX activated contacts for cutting out background music- Adjustable VOX contact