代理服务器必须公开的最小端口集是 80 和 443。

The minimum set of ports required to be exposed by the proxy server are 80 and 443.

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一些HTTP代理服务器也许会限制端口或者只允许特定的被授权的服务器来访问。

Some HTTP proxy servers may restrict ports or allow access only to specific, authorized servers.

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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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