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The Viking C-1000B controller allows you to operate a single-line phone on the same line as a door phone or paging amplifier. Place calls on hold while someone is ringing the door phone. This controller can also trigger a CCTV camera from an activated doorbox. For example, switch between two CCTV cameras when one is engaged. Also can be used to allow one analog device to answer multiple lines. Includes a built-in talk battery to support other applications.