算法分为路由探测和路由确认两个过程。
It consists of two processes, routing detection and affirmation.
如果初始事务流中的代理服务器通过请求将自身添加到了事务中来记录路由，确认信息将通过这些服务器发送。
If the proxy servers in the initial transaction flows have added themselves to the transaction through requests to record the route, the acknowledgement is sent through those servers.
UAS 将通过确认信息所经过的相同路由发送一个 BYE 消息，从而发起关闭操作，另一个用户代理将发送一个 200 OK 响应来确认此消息。
The UAS initiates the closing by sending a BYE message over the same route that the acknowledgement came over and the other user agent acknowledges this message by sending a 200 OK response.
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