| 摘要 |
PURPOSE:To prevent the call effected on the toll control, by adding the contact of the called party information reception relay with the count circuit and compulsively making the count state of the count circuit to the past state at response, in automatic call from the extension telephone set to the office line. CONSTITUTION:When the extension subscriber performs automatic transmission to the office line, the number of dial digits are finished at a given digit, and when the subscriber is in the state of busy with the office line, the polarity of the communication line is inverted with the response of the office line subscriber, the relay E not shown is operated, PD relay is operated by it, and the state of the response count circuit is compulsively to the past state. Thus, the call effected on the toll control can be prevented. |
