| 摘要 |
PROBLEM TO BE SOLVED: To inform a transfer destination of interruption call even when transferring the interruption call from an outside line during speaking becomes impossible. SOLUTION: When the interruption call incomes from an exchange network 1 to the outside line 11 during speaking by a slave set 20A and the originating ID of the interruption call-receiving person is reported, the main control part 14 of a main equipment 10 detects the interruption call and receives the originating ID. When detecting the flash signal sending operation of the set 20A after detecting the interruption call, the part 14 answers to the interruption call. When detecting the holding operation of the outside line, the part 14 holds an interruption speech. When detecting call operation toward a slave set 20B showing the transfer destination of the interruption call-incoming, the part 14 performs extension call to the set 20B and when detecting holding releasing operation during this extension call, the part 14 informs the set 20B of the originating ID of the interruption call to display it.
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