Abstract: An automatic call distributor system (28) with an automatic call distributor (20) for selectively interconnecting telephonic calls from external telephonic units (32) of an external telephonic network (34) to a plurality of Integrated Services Digital Network (ISDN) interior telephonic units (30) with ISDN characteristics and a microprocessor (50) in the ISDN telephonic unit (30) for controlling the ISDN telephonic unit (30) to alter and enhance performance characteristics of the ISDN telephonic unit (30) in an automatic call distribution environment.

Abstract: A telephone system usable for example in hotels or the like and in which each of a plurality of telephone sets is equipped with a special status indicator or signal light as well as the usual bell, the system being characterized in that the indicator is automatically excited without ringing the bell by voltages applied from the ring generator whose output signal is connected across the tip and ring leads of a telephone line when the latter is placed in a special status (message waiting) by a status signal in the control unit. The ring generator is constructed to produce special status indicator excitation voltages during the "bell silent" intervals of its output signal, and the indicator is periodically actuated by connecting that output signal across the tip and ring leads of telephone sets, which are in the special status, during at least a portion of such intervals.