| 摘要 |
PROBLEM TO BE SOLVED: To surely notify a portable telephone set of the history of a failure in the case a telephone set to which a caller number notification service is offered fails in an incoming call to the portable telephone set. SOLUTION: When an outer walkie-talkie 11 is connected to a fixed telephone set 1, an incoming call history notifying device 20 receives its subscriber number from a mobile telephone exchange 5 to store the subscriber number and notifies the portable telephone set 2 of the stored subscriber number via the mobile telephone exchange 5 by inputting a special number to the portable telephone set 2.
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