| 摘要 |
PURPOSE:To increase the use efficiency of a calling subscriber by the level of a service to receive a presentation at the time of the dial of the same number by distributing a call to other switchboard in accordance with a service grade changing request from the switchboard to be received first. CONSTITUTION:At a switchboard 2, the switchboard service request from a subscriber 1-1 is detected, and when the calling is executed, it is connected to a switchboard 3-1. When the changing request of a service grade by the subscriber 1-1 is executed, it is connected through a key operation, etc., at a board 3-1 to a board 3-2 or an automatic response board 4 in accordance with the grade. In the board 3-2, the correspondence by the machine correspondence of a sound response and a voice discriminating device is executed by a response board 4 as the service with a low grade, the confirmation with the calling of a subscriber 1-2 is executed, subscribers 1-1 and 1-2 go to a call condition and a collect call service is presented.
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