- Viking universal paging interface- Select: FXO (loop start), FXS (ring trip) or paging port (VOX relay) interface mode- No power supply required in FXS interface mode- Up to 6 units can be powered from one adapter in the FXO or VOX mode- 30V DC talk battery for interfacing with FXO or unused phone system line input/trunk port- Floating 600 ohm paging output with volume control- Normally open or closed relay for external paging amp activation or interfacing the paging amp with an external background music