| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication apparatus for surely detecting polarity inversion due to the response of a notification destination to notify the contents of notification. SOLUTION: The apparatus is provided with a confirmation communication control unit 108 for calling a predetermined opposite party using a line control unit 101 or a dial transmitter 102 to perform communication, a polarity inversion detector 105 for detecting the presence or absence of inversion of voltage polarity of a telephone line during performing communication, and a response time polarity inversion setter 111 for setting a polarity inversion timing at the time of response on the basis of a response detecting signal from the response detector and a polarity inversion detecting signal from the detector 105. COPYRIGHT: (C)2005,JPO&NCIPI
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