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The DP38-C Main Intercom Controller is the 3rd Generation DoorBell Fon interface - the "brain" of the DoorBell Fon system. This product allows users to answer a door or gate from any telephone in their home or business. This 3rd generation controller can handle up to 4 different doors, is chock-full of features, and is upgradeable to open doors or ring door chimes.Operation is simple. No programming! No codes! Just answer the phone like a regular telephone call!