System for monitoring dialled telephone numbers
    3.
    发明授权
    System for monitoring dialled telephone numbers 失效
    用于监控拨号电话号码的系统

    公开(公告)号:US4013839A

    公开(公告)日:1977-03-22

    申请号:US522129

    申请日:1974-11-08

    IPC分类号: H04M3/64 H04M15/06 H04M15/26

    CPC分类号: H04M3/64 H04M15/06 H04M15/26

    摘要: A system for monitoring dialled numbers is disclosed which provides a subscriber with a record of numbers dialled over his telephone line or lines. The system provides a monitoring unit inductively coupled to each line which tapes the dial pulses as they are dialled. Aslo included is a control processing unit which processes the individual tapes to provide a written record. The system thus eliminates the need for duplicating costly equipment such as discriminators and printers at each line.