此代理服务器的功能非常多，并不能在此予以全面讨论，但我将重点讨论两个我认为最好的功能。
The proxy server has far too many features to adequately cover here, but I will highlight two of what I consider its best features.
让我们看一看将安全代理服务器配置为在一个包含两个集群的拓扑结构中进行路由所需的步骤，如图4所示。
Let's walk through the steps required to configure a secure proxy server to route across a simple two cluster topology, as shown in figure 4.
HTTP 应用程序将显示采用两个 SIP 用户代理服务器 (UAS) 的地址和端口号的网页，并启动它们之间的连接。
The HTTP application will display a Web page that takes the address and port numbers of two SIP User Agent Servers (UAS) and initiate a connection between them.
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