内部通信 meaning in English

communication interior
intercommunication
interior communications

I can send him a note via the internal mail system
我可以通过内部通信系统给他发个通知。
Mr . hobbs ? it ' s me on the intercom
霍布斯先生？我，内部通信系统的
General rules and testing methods for intercommunication equipments
内部通信设备的通用规则和试验方法
Ics - internal communication system
内部通信联络系统
The interior communication is presents from chapter two to chapter four
从第二章到第四章讨论的是内部通信问题。

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