| 摘要 |
PROBLEM TO BE SOLVED: To store no invalid and unnecessary dial number in a redial memory. SOLUTION: When a call is originated by a dial number which can not be connected with a line due to an incorrect calling destination number, etc., by a telephone set 1 with a redial function, the dial number is not stored in the redial memory 4. In addition, the number of digits used for the call is inspected and when it cannot be as the telephone number, the dial number is not stored in the redial memory 4.
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