他们用内部通话系统呼叫他。

They called him on the intercom.

《牛津词典》

为了完成管理域之间的通话呼叫，本附件描述H . 323系统中的管理域之间允许地址鉴别的方法。

This annex describes methods to allow address resolution between administrative domains in H. 323 systems for the purpose of completing calls between the administrative domains.

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系统内的任一话站均能与控制室或其他话站呼叫通话，每个话站均有选择任一通话通道的权利，系统内每个话站有六个通道，通道间没有干扰或串音。

Every station of the system can call to controlled room and other telephone station and can select every channel. There are six channel in every station and no interfere or noisy within the channel.

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