第一部分是公司已经拥有的第三方通讯基础设施组件，例如PBX系统，IP电话，以及企业级业务应用系统和目录。
The first element is the third party communications infrastructure components a company has in place such as PBX systems, IP Phones, and enterprise business applications and directories.
这种隔离提供了安全性，也消除了建设业务通讯基础设施以满足多用户同时通讯的需求。
This insulation provided security and eliminated the need to build an operational communications infrastructure capable of supporting communications sessions with multiple concurrent users.
该通讯系统的应用，增强了整个GPS遥感大气水汽探测网的可维护性，为最终实现GPS水汽探测网的业务化运行奠定了一定的理论和实践基础。
The application of this communication system can enhance the maintainability of the system and facilitate the operational application of the GPS water vapor remote sensing network.
该通讯系统的应用，增强了整个GPS遥感大气水汽探测网的可维护性，为最终实现GPS水汽探测网的业务化运行奠定了一定的理论和实践基础。
The application of this communication system can enhance the maintainability of the system and facilitate the operational application of the GPS water vapor remote sensing network.
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