| 摘要 |
PURPOSE:To enhance the reliability of the calling by sending a call radio wave signal to a master set of the cordless telephone set and then a slave set of the cordless telephone set when a radio signal is sent to an interphone slave set from the cordless telephone set. CONSTITUTION:When a reply from a master set 6 of the cordless telephone set is not received by an interphone slave set 1 with respect to a call signal from the interphone slave set 1, the call signal is sent to a slave set 12 of the cordless telephone set succeedingly. After the call to the slave set 12 of the cordless telephone set is finished, the slave set 12 of the cordless telephone set relays the call signal to the master set 6 of the cordless telephone set newly.
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