| 摘要 |
PURPOSE:To attain the improvement of a connection completion ratio, and the reduction of a connection time, by providing a telephone number accumulating means, comparing an accumulated telephone number, with an outside incoming telephone number, and loop back-connecting when they coincide. CONSTITUTION:At the time of selecting an outside incoming telephone number Nn attached on another tenant 2-n sharing an electronic private branch exchange 1 by an extension 5-11, a central control unit 110 refers an area 1111 in a main memory device 111, and extracts the outside incoming telephone numbers N1 through Nn stored in advance in order, and compares them with the outside incoming telephone number Nn accumulated in an accumulation part 1101 by a comparator part 1102, By detecting the coincidence of the telephone numbers, a return-connection is performed by a channel p2 in a channel network 13 without passing through a public telephone exchange network 3.
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