| 摘要 |
PURPOSE:To prevent the re-response to new calling, after the subscriber for incoming mobile telephone is finished for the call in advance during call, by identifying the state of conventional subscriber allocating exchange station with the register sender in the mobile telephone allocating station. CONSTITUTION:When the mobile subscriber, not shown makes a call, the register sender trunk RST in the mobile telephone exchange station is connected to the subscriber trunk LT assigned to the subscribers via the network NWO, and further connected to conventional subscriber allocating exchange station via the relay lines. The ground via the contact L deg. of the subscriber circuit LC of convertional subscriber allocating exchange station, or the ground via the relay D of the incoming trunk ICT is connected to the call line depending on the vacancy or bursy of the relay lines. The DC potential monitor circuit IC in RST operates the relays ID and LP when the relay line is vacant. RST stats the outgoing operation of the mobile subscriber by it and if the relay line is busy, busy tone is fed to the mobile subscriber by the circuit, not shown to prevent the re-response by mistake. |
