| 摘要 |
PURPOSE:To trace a malicious call without hooking operation by collating a call with a malicious call tracing registering table at a call from an outgoing station and executing the trace of malicious call at the state of calling when the caller is a malicious call registration subscriber. CONSTITUTION:When a malicious caller 6 dials a telephone number of an incoming subscriber 7, the dial number is collated with a subscriber number registered in the malicious call tracing registration table 3 provided in an exchange and when they are coincident, just after the incoming subscriber 7 replies, only the channel of incoming subscriber 7 malicious call sender 6 is interrupted. This is conducted by cutting off the path of the secondary time switch 14 during a prescribed timing period only. When the incoming subscriber 7 hooks off during the said timing period, since the channel is set to a path of incoming subscriber 7 malicious call sender 6 only, a click sent to the path of incomingsubscriber 7 malicious call sender 6 i not sensed by the malicious call sender 6. |
