| 摘要 |
PROBLEM TO BE SOLVED: To surely recognize the who is calling in a telephone system. SOLUTION: A ringing signal sent from an exchange through a telephone line is detected. When the ringing signal is detected prescribed number of times, a calling side telephone number and a caller's name sent together with the ringing signal from the exchange through the telephone line are once stored in a RAM, and the caller's name is read preferentially and displayed on a display part.
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