| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a telephone system wherein operation switching control can be conducted without causing contradiction to call control even when a wireless slave unit is made to continue the operation of a master unit to which the wireless slave unit is wrongly installed. <P>SOLUTION: When the wireless slave unit 40A of a wireless telephone set 20A that is different from a master unit 30B is hooked off from the master unit 30 that is in one of operating states of dialing, call terminating or line-acquiring, a shift management means 15C discriminates the propriety of a shift to the operating state of the master unit 30B on the basis of setting information of a master unit 30A paired with the wireless slave unit 40A, and when the discrimination indicates the possibility of the shift, the call control means 15A of a main device 10 releases the operating state of the master unit 30B, shifts the master unit 30A paired with the wireless slave unit 40A to the operating state, and the wireless unit 30A continues the operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
