| 摘要 |
PROBLEM TO BE SOLVED: To realize call back communications even when a call back function is not provided in a radio slave set, to reduce the frequency of causing line occupation due to the impossibility of call back communications and to simplify the connecting call monitoring control of a radio master set. SOLUTION: A radio slave set 14 requests call back communications to a radio master set 13 connected through a radio line. The set 13 calls a data providing source 3 in a state of keeping radio line connection with the set 14 to execute cable line connection. This cable line connection and radio line connection between the set 13 and set 14 are linked. The set 14 gains data from the source 3 by call back communications.
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