| 摘要 |
PROBLEM TO BE SOLVED: To identify all callers through the ISDN line and general telephone line and also makes an incoming answer after an incoming call is selected. SOLUTION: Relating to the button telephone main device 102, a caller number identifying and storage means 106 identifies and stores the number of a caller as to an incoming call received through the ISDN line 103 or general telephone line 104 connected to the button telephone main device 102. A caller number notification means 107 notifies a button telephone set 105 of the acquired caller number. A display means 109 displays the acquired caller number. Further, the displayed caller number is selected and decided by an operation notification means 110. Through this constitution, callers are displayed by incoming calls which are generated at the same time, identified and selected, and answered.
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