| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio button telephone system which can function as outside-line buttons as many as necessary outside the lines, even when the number of outside-line buttons is limited. SOLUTION: A private branch exchange 100 has an operation state storage part 107, which records the operation states of lines by blocks and an extension interface part 101, and a master device 200 has a data transmission and reception part 202, which communicates with the private branch exchange and a master device radio transmission and reception part 203, which communicates with a slave device. The slave device 300 has a display part 303, which displays the operation states of the lines corresponding to blocks, a key input part 304 which indicates changes of the operation states of the lines, a slave device radio transmission and reception part 301, and a slave device control part 305, which controls the whole and a slave device control part 305 sends an indication for changing a block as to the display of the operation states of the lines to the private branch exchange, and inputs and displays data on the operation states of the lines, corresponding to other blocks at the display part 303.
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