Patent ID: 8401173

Claim:
A telephone-line-connection method for a call-connection device configured to connect a call from an originating terminal to a destination terminal, the telephone-line-connection method comprising: determining whether a call-connection condition set to the call-connection device is a first call-connection state or a second call-connection state; connecting a call from the originating terminal to the destination terminal when a result of the determination shows that the call-connection condition is the first call connection state; and performing call-connection processing for connecting the call from the originating terminal to the destination terminal and performing call-termination processing without waiting for a disconnection request transmitted from the originating terminal or the destination terminal when the determination result shows that the call-connection condition is the second call-connection state, wherein the performing call-termination processing includes performing call-disconnection processing between the originating terminal and the destination terminal by transmitting a call-disconnection signal from the call-connection device to the destination terminal in response to a ring-back tone signal after transmitting a call-setup signal from the call-connection device to the destination terminal and before a call-setup processing responsive to the call-setup signal is completed in the destination terminal, the call-setup signal instructing an execution of the call-setup processing, the call-disconnection signal instructing an execution of the call-disconnection processing, the ring-back tone signal being transmitted in response to the call-setup signal from the destination terminal to the call-connection device.