| 摘要 |
PURPOSE:To attain the recording of detail of call charge on the condition of the protection of privacy of a subscriber by transferring call charge detailed information to a telephone set from an exchange at the end of a call for displaying and recording it, erasing the detailed recording of a detail recorder after the transfer and recording only the number of times of a calling circuit. CONSTITUTION:The detailed charge information recorded in a memory MM of a charge detailed information recorder LAMA is read by a central processing unit CPU and transferred to a charge detailed information transfer trunk LAMA- TRK (MODEM M/D) via a communication control unit CCU. A receiver REC of a charge detailed information recorder M-IND of a telephone set receives the polarity inversion and an MODEM start frequency from the trunk LAMA-TRK and discriminates the start. Then, the MODEM communication between the trunk LAMA-TRK and the device M-IND is attained further, the call charge detailed information is transferred and recorded to a microprocessor MCPU. After the trunk LAMA-TRK transfers the charge information, it starts the device LAMA. The device LAMA erases the content of detailed recording after the end of information transfer, integrates once the number of calls of the subscriber and completes the control. |
