| 摘要 |
PROBLEM TO BE SOLVED: To ensure communication for an important subscriber by making a slave station and a base station use a control channel and to communicate information when a telephone subscriber who makes a call is an important subscriber registered in advance or when a call destination is a previously registered emergency communication destination, when there is no empty channel of a radio channel between the slave unit and the base station. SOLUTION: When a receiver of a telephone set 12 is picked up, an off-hook signal is communication to a slave station 2, and when a speech communication channel empty information recognizing part 21 of the station 2 shifts a processing to an emergency sending recognizing part 22 and confirms that he is an important subscriber, a tone generating part 23 produces dial tone and sends it to the set 12. When the set 12 dials the telephone number or a center, the part 22 of the station 2 compares emergency communication destination registration information with the sent dial number, and when it is a registered emergency communication destination, a control channel controlling part 25 superimposes a channel dial number on a radio control channel, sends it to a base station 3 and configures a loop.
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