| http://www.w3.org/ns/prov#value | - lephone set, the system including steps of: in response to hooked off of a first telephone set call to the opposite side, transmitting a line connection request signal and selected unit ID among the preliminarily registered unit IDs on a control channel to the master telephone set; in response to receipt of the line connection request and the unit ID, checking whether the received unit ID is of it
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