This TAMB2 Telephone Access Module with Power Supply from Bogen Communications is designed as an interface between a telephone system and a paging system, providing dual-purpose voice paging. It's compatible with the full range of analog telephone port types, and is capable of station port or trunk port operation. Music from a background music source (with stereo-combining RCA jacks and volume control) is possible via a line-level input, which allows background music to be used during a page with central paging amplifiers don't have a muting provision. This module is ideal for simple or complex telephone paging situations. A 24V power supply is included and is required for all modes of operation.