Adapter for connecting 4-wire or FTZ door phones to an analogue port of modern PBXs.

Access of older door phone systems with up to 2 bell buttons to an analogue port of a modern PBX system

Inverter from 4-wire and FTZ 123 D 12-0 interface to analogue subscriber ports

Additional switching options via optional a/b Switching Modules

Power supply via bell transformer

Separate volume control for both speech channels, impedance adjustable

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