PURPOSE:To designate a call-back destination telephone set from an arbitrary telephone set by consisting the system so that after a call-back setting person sets a call-back from a first telephone set, the contents corresponding to a telephone set number of a person to whom a call-back is set of a call-back memory are rewritten to a second telephone set number from a second telephone set. CONSTITUTION:The system is provided with a switch 10, a central control equipment 20 and a main storage device 30, telephone sets 200, 300 and 400 are connected to the SW10 through line circuits 40, 50 and 60, respectively, and the telephone sets 200, 300 and 400 consists of the same constitution. In this state, after a call-back setting person sets a call-back from a first telephone set, the contents corresponding to a telephone set number of a person to whom a call-back is set of a call-back memory are rewritten to a second telephone set number from a second telephone set. In such a way, a call-back destination telephone set is designated from an arbitrary telephone set, and even when the call-back setting person move plural times, a call-back is received smoothly.
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