Malicious call search system

Abstract

Abstract PURPOSE:To make it possible to search for a malicious calling subscriber rapidly in an extremely easy way by adding an additional unit to a called telephone set, by transferring information between the additional unit and an exchange by using a full-confirmation type signal, and then by sending a calling-subscriber's number to the additional unit. CONSTITUTION:Called-subscriber's telephone set SUB.B is provided additionally with additional unit MCTAU and a full-confirmation type signal, an inter-office signal, is used for information transfer between unit MCTAU and outgoing sender OS of an exchange. Then, the telephone number of calling subscriber SUB.A is sent out so as to search for the malicious calling subscriber rapidly in an extremely- easy way.

Inventors

• 👤 Takashi Morita

Bibliographic Details