As described in this Information Center article, the SIP side of the proxy has the ability to route to a cluster based on a variety of mechanisms, including the message type explained in my example.

如这篇信息中心文章中所述，代理的sip侧有能力基于各种机制路由到集群，包括在我的示例中介绍的消息类型。

youdao

While in New York for my usability conference, I wanted to take the speakers out for an evening of jazz. Here's the information I found about a Jazz at Lincoln Center performance

当在纽约参加我的可用性讨论会时，我想带演讲人们晚上出去听听爵士乐。

youdao

One of my first steps was to set up a meeting with the Kansas Parent Information Resource Center (KPIRC) to discuss our approach to involving families.

WHITEHOUSE: Fostering a School and Home Connection