H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/0.5
H04Q 3/72 (2006.01) H04M 3/533 (2006.01) H04M 3/56 (2006.01) H04M 7/00 (2006.01)
Patent
CA 2028258
NE-292 - 11 - ABSTRACT OF THE DISCLOSURE In a telephone switching system, subscriber line interfaces are connected to a switching network for detecting a hook flash. A three- way trunk circuit operable in a called-party release mode is connected to the network in addition to incoming and outgoing trunks. Individual subscriber data are stored in a main memory indicating the presence or absence of a request from a subscriber for detection of a malicious call and a telephone number of a third-party subscriber. The control unit of the system is responsive to a normal call request for establishing a normal connection in the switching network and clearing it on a calling party or first-party release basis, and responsive to the detection of a hook flash by a subscriber line interface for identifying it as corresponding to the subscriber from which the request is made. A first connection is then established between the identified subscriber line interface and the three-way trunk, and the normal connection between the identified subscriber line interface and a calling party from which the malicious call has originated is cleared. A second connection is established between the three-way trunk and the malicious calling party and a third connection between the three-way trunk and a subscriber line interface of the third-party subscriber.
Corporation Nec
Smart & Biggar
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