| 摘要 |
PURPOSE:To call the server, who is concerned with connection of the central office trunk to the extension telephone set, by the recall operation of the subscriber of the extension telephone set, by storing the attendant board of said server. CONSTITUTION:When the call comes to the central office trunk (COT) connected to the switching network (SW), it is displayed on attendant board ATT. When the server of the i-th ATT operates the response button, central control device CC connects this ATT and COT through channel control device SPC. Next, when the server of this ATT dials the number of extension A, CC transmits the call signal to A to connector COT and A. At this time, CC records information of A in the area of storage device M corresponding to this ATT through memory control part MC. When A operates for recall during the service between A and COT, CC retrieves information of A from recorded contents of M and displays the recall on this ATT automatically. |
