The response is retrieved by a second request, also modeled as a request/reply operation with two messages sent as a single transport-level exchange.
响应由第二个请求检索，它也被建模为请求／答复操作，同时有两条消息被作为单个传输层交换发送。
The initial request is modeled as a request/reply operation, with two messages sent as a single transport-level exchange.
初始请求被建模为请求／答复操作，同时有两条消息被作为单个传输层交换发送。
This is done through exchange of a Registration Request and Registration Reply messages (which are sent with UDP using well known port number 434).
注册请求和注册应答消息通过知名端口号434发送。
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