| 摘要 |
PURPOSE:To reduce the time for redialing by arranging a busy tone detection circuit and a registratin table applying group edition and registering to destination terminal equipments to a dial section of a communication terminal equipment. CONSTITUTION:Terminal numbers of destination terminal equipments edited at every group A, B are registered and stored in a group call registration table 11. The busy tone signal detection means 12 identifies a busy signal received from a communication line 20 and detects the signal and informs the result to a group call means 13. The group call means 13 extracts one of call groups of the table 11, e.g., a terminal number included in a call group A as a group call during the call and another terminal number included in the call group A in receiving the reception notice of a busy signal in response to a prescribed order. Then the comnunication circuit 20 is restarted automatically and the terminal number extracted newly is sent to the circuit 20 to call the terminal equipment as a dial code.
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