JPH05252243

PURPOSE:To attain outgoing and incoming call processing through an external line between a master set and slave sets by providing the master set, the plural slave sets to the telephone set and registering ID codes of the master set different from each other to each slave set so as to allow each slave set to access the master set freely. CONSTITUTION:An ID code is registered in advance in an IDROM 16 in a master set 1 and when a slave set 30 is accommodated to the master set 1, the ID code stored in the IDROM 16 of the master set 1 is copied to an IDROM 32 of the slave set 30. Then in the case of outgoing/-incoming call, when data are sent 7 received via a radio line between the master set l and the slave set 30, the ID code is used without fail for the communication and when the ID codes are unmatched, the outgoing and incoming call is not allowed. Thus, each master set is accessed freely.