内部通话 meaning in English

incom intercom

Generic specification for intercommunication system of armoured vehicle
装甲车辆内部通话系统通用规范
Stand down and squawk on your a vx
撤退，转入内部通话
The second includes installation of an intercom and buzzer system in every police cell , linked to a console beside the duty officer ' s desk
第二项计划包括在警署每个羁留室安装一个内部通话器及警钟系统，连接至当值人员办公桌旁的一个控制台。
But other cost savings can be derived from the reduced call fees that result from not having to use expensive public phone networks for internal communications
还有一些减少成本的方面，比如进行内部通话时无需使用昂贵的公众电话网从而减少电话开销。