当预定数量的参与者存在和可用时，会议服务器发起会议呼叫。
When the predefined number of participants are present and available, the conference server initiates the conference call.
当预定数量的参与者存在和可用时，会议服务器发起会议呼叫。
When the predefined number of participants are present and available, the conference server initiates the conference call.
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