SIP RFC 定义了两种类型的代理服务器，有状态代理服务器和无状态代理服务器。

The SIP RFC defines two types of Proxy Servers, one stateful and one stateless.

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而在HA环境中(图2)，无状态代理服务器不能从Web服务中获得任何上下文，因而无法将Web服务路由到正确的计算机。

In an ha environment (Figure 2), the Web service has no context for the stateless proxy servers to route the Web service to the correct machine.

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对于代理服务器中的SIP功能，务必了解它是无状态的。

For the SIP function in the Proxy server, it is important to understand that it is stateless.

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