| 摘要 |
PURPOSE:To open trunks between an originating station and the next station in the side of the originating station and set forcibly an originating terminal to the lockout state by transmitting a response signal from the next station to the originating station for a certain time to disconnect the next station. CONSTITUTION:While a busy tone BT is transmitted from a tone trunk TNT to an originating station OX, the response signal is returned from a next-station trunk TRK2 to an originating-station trunk TRK1. Then, a BT cut-off response signal is released, and the originating station OX discriminates disconnection of the side of a next station TX and starts forcible release. Therefore, since the originating-station trunk TRK1 and the next-station trunk TRK2 are opened at this time, they can be used for the next call. |
