| 摘要 |
PURPOSE:To attain connection in an impartial order by recording the order of idle terminal devices and the order of incoming lines awaiting an incoming call in an exchange. CONSTITUTION:When one of terminal devices 14a-14p is finished for talking and a channel switch 10 is restored, terminal idle information is given from a line circuit 13i to a central processing unit 20 to check whether or not a waiting trunk line exists. When no waiting trunk line exists, a terminal number is recorded to a memory 31 and displayed. When the waiting trunk line exists, the number recorded at first is read from the memory 31 to erase the recorded display of the trunk line number to connect the line circuit 13i of an idle terminal device and a trunk line trunk 12j via the channel switch 10. |
