The TIF-2000A is a single line digital hybrid telephone line interface designed to be compatible with ADAM-M, ADAM, ADAM-CS, Cronus, Zeus, and CS 9000 series intercom systems. It provides bidirectional 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 1U high by 1/2 wide rackmountable (via an optional MCP-1 or MCP-2 kit) TIF-2000A provides a transparent link to the telephone system enabling full dial-out capability from any designated keypanel with keypad. The TIF-2000A has full dial-in capability giving the caller a keypanel on the system via commands from the DTMF pad on their telephone. Since the TIF-2000A 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.