| 摘要 |
PURPOSE:To call a fixed telephone set even if no slave device is included in a registered zone and to decrease the invalid incoming calls by providing a position register table which stores the zone No. registered manually or automatically by a mobile slave device and a No. table for wire fixed telephone sets corresponding in l:1 to each mobile slave device. CONSTITUTION:A No. table is provided to show the correspondence between the module slave devices 11 and 12 and the wire fixed telephone sets 16 and 17 respectively. When the device 11. has no response to an incoming call, that is, when no position is registered as yet in a new zone even though the position is registered in another zone distant from the zone where the device 11. is registered or when the power supply of the device 11 is cut off and the device 11 is not available, a call is given to the set 16 corresponding to the device 11 by reference to the No. table. Thus the connection is formed with the carrier of the device 11 and an invalid incoming call is prevented. |
