If your phone system has no microphone input and no easy way to tie into your overhead speakers, the Viking PI-1A paging interface bridges that gap cleanly — letting you page, play background music, and ring an electronic night bell all through your existing audio system. The PI-1A connects to nearly any phone system's paging port and provides a floating 600-ohm output to drive your public address equipment. When someone makes a page, the built-in voice-activated (VOX) relay automatically mutes background music using its DPDT contacts, then restores it when the page ends. No paging port available? No problem — the PI-1A can supply 22V DC talk battery to connect your PA system to an unused line or trunk input on the phone system instead. It's a versatile workaround that keeps your installation clean without adding complex external hardware. The electronic night bell feature works with either a ringing analog PABX/KSU station circuit or a contact closure from an electronic key system, making it compatible with a wide range of setups. Both ring pitch and volume are independently adjustable, so you can distinguish between multiple ringing lines in larger facilities. Our Expert Take: The PI-1A is especially valuable in environments where the phone system — Panasonic, Intertel, South Western Bell, and similar platforms — doesn't natively provide a paging contact closure. In those cases, the VOX relay handles music muting automatically, saving you from having to rewire or modify the audio system. The adjustable VOX sensitivity and contact time-out are small details that make a real difference in noisy environments where false triggers could be a problem. If you're integrating an older key system with an existing PA setup, this is one of the simplest and most reliable ways to get it done. Key Features Connects nearly any phone system to a public address system for overhead paging Floating 600-ohm audio output for PA system integration Built-in VOX (voice-activated) relay with DPDT normally open and normally closed contacts for automatic background music muting during pages Adjustable VOX trigger sensitivity and contact time-out Selectable 22V DC talk battery for connecting PA system to an unused phone system line or trunk port when no paging port is available Electronic night bell activated by ringing analog PABX/KSU station circuit or common audible contact closure Independently adjustable ring pitch and ring volume for differentiating between multiple ringing lines Wall mount housing with mounting hardware included Technical Specifications Audio Output: Floating 600 ohm Talk Battery: Selectable 22V DC Relay Type: DPDT VOX-activated (normally open and normally closed contacts) Night Bell Input: Ringing analog line or contact closure Mounting: Wall mount Hardware Included: (2) #6 x ¾" panhead screws
