| 摘要 |
PURPOSE:To prevent the incoming tone sent from slave equipment from being broken by sending a new incoming signal out to a called object slave equipment for a new incoming through the same radio transmission and reception part and speaking channel with an incoming when the new incoming different from the incoming is generated. CONSTITUTION:When there is an extension incoming from one slave equipment to the other equipment during a line wire incoming, master equipment 1 detects it as an incoming B. Further, data on a last incoming A and data on the current incoming B are sent to the slave equipment side through the speaking channel of the same RF unit 13. Then when answer data on the incoming A are sent after slave equipment 31 answers to the incoming A, the master equipment 1 sends speaking channel data back to the slave equipment 31 to switch the speaking channel. Further, switching to an RF unit 131 is performed. When the answer signal from the slave equipment 31 for the sent speaking channel data is received through the speaking channel of a switched RF unit 132, an A speaking command is sent to the slave equipment 31, which makes a line wire call through the RF unit 132.
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