The RTS TIF2000A is a single line digital hybrid telephone line interface designed to be compatible with ADAM Series, Zeus Series Intercom systems and Cronus Intercom systems. It provides bi-directional communication between the intercom matrix and a standard DTMF capable telephone line. It allows the phone to access all crosspoints of the matrix, as well as dynamic party lines, IFB circuits, and other forms of communications. The 1RU high by 1/2 wide rack-mountable (via an optional kit) TIF2000A provides a transparent line to the telephone system enabling full dial-out capability from any designated keypanel with keypad. The TIF2000A has full dial-in capability giving the caller a keypanel on the system via commands from the DTMF pad on their telephone. Since the TIF2000A appears to the matrix as any other keypanel would, the only limitation on the number of units in the system is the same as for other keypanels.