他们用内部通话系统呼叫他。

They called him on the intercom.

《牛津词典》

固定-移动电话系统可以让移动电话通话经由公司内部的中央电话交换机来连接，这样可以大大减少打电话的支出，尤其是国际电话。

Some FMC systems, for example, allow calls from mobile phones to be routed through a company's central switchboard. This makes outgoing calls, particularly international ones, much cheaper.

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声力电话及内部通讯系统使得火控官可以和分散在各舱室的全体组员通话。

Sound-powered telephones and interior communications systems make it possible for a control officer to talk to whole groups of men at many stations.

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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。

The second includes installation of an intercom and buzzer system in every police cell , linked to a console beside the duty officer ' s desk.

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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。

The second includes installation of an intercom and buzzer system in every police cell , linked to a console beside the duty officer ' s desk.

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