| 摘要 |
PURPOSE: A conference call method in a circuit switching network is provided to maintain the conference call of conference callees irrespective of the disconnection of a channel of a conference caller who requests the conference call. CONSTITUTION: A switch 1 retrieves whether a hook-on signal is received from a conference caller(202). If the hook-on signal is not received from the conference caller, the switch 1 retrieves whether a hook-on signal is received from a conference callee(204). If the hook-on signal is received from the conference callee, the switch 1 recognizes that the number of conference callees is decreased by 1(206). The switch 1 judges whether the conference callee is a last conference callee(208). If the conference callee is not the last conference callee, the switch 1 turns off a channel with the corresponding conference callee(216). If the hook-on signal is received from the conference caller, the switch 1 retrieves whether the number of conference callees who currently perform the conference call is one(220). If the number of conference callees is two ore more, the switch 1 performs a conference call sub-routine among the conference callees.
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