| 摘要 |
PURPOSE:To confirm the validity of a using place to prevent a crime by connecting a terminal device which is carried by an operator to a subscriber's telephone line, transmitting a subscriber's telephone number, terminal number and a customer's number to the center, then the telephone is turned off provisionally and calling the telephone from a center in return. CONSTITUTION:An operator moves the customer's place by bringing a portable terminal device 3 with him, and a computer system 1 is called by a subscriber's telephone set 2 of the customer. When the line is connected, a terminal number, a customer's number, and a subscriber's telephone number used which are registered beforehand are transmitted, and the telephone is hung up provisionally. The center 1 dials in return the number of the telephone 2 which is transmitted now, connects the movable terminal device 3, and exchanges transaction data between the terminal device 3 and the center 1. Thus, a criminal is prevented, and the customer's burden of charges which are accompanied to the calling can be avoided. When the center 1 collates the transmitted number data with the table which is provided at the center 1, a crime can be prevented more securely. |
