| 摘要 |
PURPOSE:To supervise talking state via a talking line of a mobile station at a fixed station by receiving a dial signal from the mobile station and recording a dial number and a talking start and end time by means of a printer. CONSTITUTION:When a connection request signal comprising a tone signal from a mobile station MS such as car is transmitted, a relay contact r<2> of a fixed station FS is operated so as to connect a telephone line L1 from a telephone set TELA to a radio equipment TRXF. When a dial signal is transmitted from the mobile station MS, an exchange performs exchange connection. A supervisory device SUP of the fixed station FS detects the presence of a line voltage applied to a talking line L1 from the exchange and the polarity, decodes the dial signal and records the dial number, the calling time and the talking start and end time onto a printer. |
