PURPOSE:To attain automatic calling to a desired subscriber by allowing a subscriber to apply a prescribed registration operation in a private branch of automatic exchange. CONSTITUTION:In case that a subscriber 3 makes a promise of restart of the talking with a subscriber 4 after a desired time during their talking and the talking is intermitted once, a function button time during their talking and the talking is intermitted once, a function button 31 is depressed and a subscriber circuit 5 is informed to a central controller 1 via a channel network 6. Then a registration 11 is started and a telephone number N1 of the subscriber 3 is informed. When the subscriber 3 inputs successively a telephone number N2 of the subscriber 4 and a talking restart time (t), the registration section 11 stores the telephone numbers N1, N2 and the time (t) in a registration area 21 in a main storage device 2. On the other hand, an execution section 12 supervises the presence of a registered call in the registration area 21 and when the registered time (t) reaches 0, the telephone number N1 is extracted to call the subscriber 3, and when the subscriber 3 responds thereto, the telephone number N2 is extracted to call the subscriber 4 to connect the subscribers 3 and 4.
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