TELEPHONE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a telephone system which can decrease differences in timing of processing between a slave set and a master set connected through radio and can quickly confirm a state of the master set and a transmitter's telephone number on the slave set side. SOLUTION: Processing for judging whether radio communication is enabled from a master set to a slave set or not is performed by a radio communication means 10 immediately after polarity inversion of a line is detected by a polarity inversion detection means. In parallel to this processing, transmitter's information to be transmitted from a line is received by a modem part 5. At the point of time when radio communication is enabled, information on a state of the master set is immediately transmitted to the slave set.