| 摘要 |
PURPOSE:To secure the service for the subscribers through the common control system automatic telephone exchange by displaying the originating subscriber number at the originating subscriber number display unit provided at the subscriber terminal or informing the number through the calling subscriber number aural information unit connected to the terminating trunk for the terminating subscriber. CONSTITUTION:In the common control system automatic telephone exchange system, originating subscriber number extracting unit ID, incoming register IR1 to receive the originating subscriber number request signal plus outgoing sender OS1 to transmit the originating subscriber number are provided at the originating station. At the same time, outgoing sender OS2 to transmit the originating subscriber number request signal plus the originating number and incoming register IR2 to receive the originating subscriber number are provided at the terminating station. In addition, display unit DISP to display the originating subscriber number or aural informating unit VOE connected to the terminating trunk is installed to the terminal of subscriber SUBB at the terminating station. Thus, when the terminating connection is given via switch frame SW2 of the terminating station, the originating subscriber number is sent back from the originating station for display or information via the voice by the originating subscriber number request signal supplied from the terminating station. |
