| 摘要 |
PURPOSE:To provide a radio telephone system which is capable of coping with the emergency calling from a slave machine in any line state by analyzing the cause when the emergency calling is not connected with a line wire and providing with an emergency calling control part to preferentially connect the emergency calling with the line wire based on the result on the side of a master machine. CONSTITUTION:The master machine of a radio telephone system is provided with a telephone number analysis part 3 judging whether the calling from a slave machine is emergent or not and an emergency calling control part 4 holding or diconnecting other calling and connecting the emergency calling with a line wire. When the slave machine performs the emergency calling such as a number 110, etc., the master machine converts a radio signal into a digital signal in a radio part 1 and transmits the signal to a frame processing part 2. Whether the telephone number for which a frame processing is performed is for emergency or not is judged in the telephone number analysis part 3. When it is judged that the telephone number is for emergency, the emergency calling control part 4 searches the slave machine which is performing the extension calling from the slave machines which are performing callings and transmits a message to the effect that the slave machine should perform a temporary holding from a message output part 5 to the slave machine. The slave machine performing the emergency calling is connected with the free slot generated as a result. |
