会议电话 meaning in English

conference call
conference telephone

The specification and test methods for conference telephone set
会议电话分机技术要求及测试方法
Wireless features : conference calling
无线电通信特征:会议电话
Operator presides telephone conference
话务员主持会议电话
The specification and test methods for conference telephone tandem board
会议电话汇接机技术要求及测试方法
Conference telephone control board
会议电话主机

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