| 摘要 |
PURPOSE:To make incoming call efficiently by calling other telephone set in the same extension representative group when a telephone set included in an extension representative group is called and does not give an answer for a specified time. CONSTITUTION:When a calling telephone set 1 calls, a ringing tone is sent from an originating register 6 through a main switch 3. When the calling telephone set 1 dials the extension number of a terminating telephone set 21, a CPU8 controls the main switch and connects the calling telephone set 1 and the terminating telephone set 21 to a ringing tone sending device 4 and a call signal device 7, and at the same time, starts a time controlling device 10. If the terminating telephone set 21 does not give an answer and the time controlling device 10 becomes time-out, the CPU8 calls terminating telephone sets 22, 23 included in the same extension representative group successively. |
