通常，SIP代理是有状态实例，而无状态代理是指定为无状态的代理。
Normally, a SIP Proxy is a stateful instance and stateless proxies are specified as such.
这样就能构建非常轻量级的无状态代理(proxy)来支持多种传输和转换选项。
This enables the building of very lightweight, stateless proxies that support a multiplicity of transport and transformation options.
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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