User agents are typically phones (POTS, mobile phones, soft phones, IP-PBX devices, and so on), but can be any SIP-enabled device.
用户代理一般是电话(POTS、移动电话、软件电话、IP -PB X设备，等等)，但可以是任意的允许SIP的设备。
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.
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。
IP telephony system can not only provide voice application, but also provide many kinds of intelligent services, it can replace the traditional Private Branch eXchange (PBX) system completely.
IP电话系统不仅能传输话音，而且能提供多种智能服务，完全可以取代传统的个人分支交换(PBX)系统。
IP telephony system can not only provide voice application, but also provide many kinds of intelligent services, it can replace the traditional Private Branch eXchange (PBX) system completely.
IP电话系统不仅能传输话音，而且能提供多种智能服务，完全可以取代传统的个人分支交换(PBX)系统。
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