| 摘要 |
PROBLEM TO BE SOLVED: To prevent an extension telephone set from being enlarged and to prevent operability for a user of the extension telephone set from being reduced without increasing the number of keys even if it is necessary for the extension telephone set to deal with a plurality of dial-in numbers. SOLUTION: A central control section 11 of a base unit 10 of a key telephone comprises a control means F44 for displaying a first dial-in call terminating state on a display means of a first dial-in number dealing function key. Further, a display control means F45 is provided for displaying a second dial-in call terminating state on display means of one or more second dial-in number dealing function keys set in advance in the first dial-in number dealing function key, and the display control means F45 identifiably displays the second dial-in call terminating state in a color different from the first dial-in call terminating state. COPYRIGHT: (C)2006,JPO&NCIPI
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