| 摘要 |
PURPOSE:To restrain the number of times of toll call by recording the number of times of toll outgoing in a memory circuit and when the number of times of toll outgoing arrives at a prearranged value, making further toll outgoing impossible by a control circuit. CONSTITUTION:In the case of toll outgoing where initial figure of telephone number is 0 or 10 etc., CPU 9 records the number of times of toll outgoing of the main wire up to the present in RAMA of a memory circuit 11. If this number of times exceeds allowable number of times of toll outgoing registered in RAMB, a dial signal sending circuit 2 is stopped by a dial sending control circuit 15, and at the same time, a timer circuit is 16 is operated. In the circuit 16, when a certain time lapsed after starting of the timer, CPU 9 erases the number of times of outgoing recorded in RAMA and enables anew toll outgoing unitl allowable number of times. |
