我对sip代理和sip出站代理有点困惑？ sip代理和sip出站代理之间的基本区别是什么？是否必须使用sip出站代理和sip代理？任何人都可以从下面的图像中指出我哪一个是sip代理和出站代理？

最佳答案 SIP代理

A SIP proxy server receives a SIP request from a user agent or another
proxy and acts on behalf of the user agent in forwarding or responding
to the request.

Sip出站代理

An outbound Proxy: A proxy that receives requests from a client, even
though it may not be the server resolved by the Request-URI.
Typically, a SIP user agent is manually configured with an outbound proxy, or
can learn about one through auto-configuration protocols.

基本上它们是相同的,唯一的区别是,SIP代理处理UAC(客户端)和UAS(服务器)的请求,但SIP出站代理接收来自UAC的请求.
并且,不,不必将SIP出站代理与SIP代理一起使用.
如果您的图像中的方案,这些不是代理服务器,而是注册服务器,用于注册用户的请求并保留这些请求的信息.