| 摘要 |
PURPOSE:To get rid of an inconvenience in the case that a callee side is busy, etc., by adding one to the dialed number of a preceding time and calling up the callee of the added telephone number when a reset calling key equipped on a key telephone set is operated. CONSTITUTION:In the case that the callee side of the dialed number is busy or the like, when the reset calling button of the dialed key telephone sets 30a, 30b-is operated, it is converted into a reset calling data inside the said key telephone set. Then, when it is decided as the reset calling data by a reset calling key decoding circuit 27, a control circuit 25 reads the dialed number in a storage circuit 26, transmits it to an operation circuit 28, adds one to the dialed number, transmits it to a dial transmitting part 24, converts it into a dial signal, and transmits it to a trunk line L. Thus, in the case that a caller knows that the callee has the line of continuous telephone number, the caller can call up the callee side by operating the reset calling button of the key telephone sets 30a, 30b-.
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