| 摘要 |
PURPOSE:To simplify the relay processing for a conference call by providing a call bus forming means which can connect the subscribers each other, and applying the central processing to the call between subscribers via an exchange and in accordance with the call carried out between both subscribers. CONSTITUTION:An operator 4 accepts a request for conference call and selects one of sound mixing trunks 3 for conference. Then an exchange certificate is produced by regarding a subscriber number of the trunk 3 as the calling subscriber. A called subscriber A1 is called via a call bus 1a, and the trunk 3 is called as a calling subscriber. Then the calling and called subscribers are connected each other. The calling subscriber number is increased by one, and the subscriber A2 is connected to the trunk 3 in the same procedure. This procedure is repeated to connect temporarily all subscribers A1-An to a conference trunk 3. Thus the subscribers A1-An can call each other via the conference trunk 3 through the exchange processing corresponding to a general call carried out by a central processor of an electronic exchange based on the exchange certificate. |
