SUCCESSIVE CALLING SYSTEM FOR NON-RESPONSE TELEPHONE TERMINAL

摘要

PURPOSE:To effectively display the function of a telephone exchange by executing successively the calling to another telephone terminal of the group when one of plural telephone terminal groups connected to the exchange does not respond to the calling of the exchange. CONSTITUTION:When a telephone terminal 1.1 calls a telephone terminal 1.3 through a telephone exchange 1.2, the telephone exchange 1.2 recognizes that the calling to the terminal 1.3 does not respond even when a prescribed time passes, and then, the exchange 1.2 calls other telephone terminal registered as the group. At this time, when a terminal 1.4 responds within a prescribed time after the calling is started, the calling can be executed between the terminals 1.1 and 1.4. When the terminal 1.4 does not respond, the exchange 1.2 calls next other telephone terminal 1.5 in the same way. These actions are successively repeated by the exchange 1.2 until either of the telephone terminals in the group responds.