| 摘要 |
PROBLEM TO BE SOLVED: To provide a telephone table capable of normally performing calls and the other operations for the calls even on the occurrence of line disconnections. SOLUTION: Disconnection of a telephone line is detected to generate a line disconnection detection signal. A selection signal for selecting one of telephone sections according to selection input is generated. One of at least two function keys is selected and validated according to the line disconnection detection signal and the selection signal. COPYRIGHT: (C)2010,JPO&INPIT
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