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Vikings Telecom Paging Interface allows you to provide pagingfrom nearly any phone system instead of from a microphone. Youcan also provide background music and electronic night bell overthe audio system.The PI-1A features a built-in voice activated (VOX) or AC ring activatedrelay which provides D.P.D.T. contacts for muting backgroundmusic during paging or to provide an electronic night bell.These contacts are necessary when interfacing with systems suchas Panasonic, South Western Bell, Intertel, etc., which do not providea paging contact closure.In the event a paging port is not available, the PI-1A can providetalk battery to allow connection of the public address system to anunused line/trunk input on the phone system.The electronic night bell feature is activated by a standard ringing analog PABX/KSU stationcircuit or by a common audible contact closure provided by an electronic key system. The ringpitch and volume are adjustable allowing you to differentiate between multiple ringing lines.