| 摘要 |
PROBLEM TO BE SOLVED: To provide a phone subscriber management device that allows a user of a called terminal to surely grasp even an incoming call caused at power- off, at the outside of zone, or in a communication disabled state. SOLUTION: The subscriber management device stores information with respect to a call request as an incoming call history when a caller terminal cannot receive an incoming call reply message because the called terminal is in an ineffective state unable to receive an incoming call with respect to a phone call request from the caller terminal. The subscriber management device informs the called terminal about the stored incoming call history when the subscriber management device discriminates that the called terminal having been in an ineffective state reaches an effective state.
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