Reverse automatic number identification system

摘要

A reverse number identification system is described which allows the called party in a telephone link to identify the telephone directory number of the calling party. This system includes a first system component located at the customer's premises which includes a display for the calling party's directory number. A second system component includes equipment connected to the calling party's telephone line located in the calling party's central office which transmits upon request the directory number of the calling party to the first system component. Each subscriber's telephone line in the central office has a microprocessor controlled transceiver placed between the incoming subscriber's telephone line and the central office switching equipment. Each subscriber's premises includes a first system component designed to receive and display the calling party's telephone number. In operation, the calling party dials the directory number of the called party and the called party responds by answering. The second system component in the called party's central office signals to the second system component in the calling party's central office by means of a request to send the directory number of the calling party. In response to this request, the second system component in the calling party's central office transmits the directory number of the calling party. The first system component located at the called party's premises receives the directory number and displays it for the called party.