At a minimum, it allows the destination to know the highest message number in the sequence so it can return a Fault if it receives any messages with a number greater than three.
至少，目的地可以用它来了解序列中的最大消息数量，因此如果它收到任何比3大的消息号时可能会返回错误。
If the originating router receives an invalid-number or user-busy code from the destination router, the originating router proceeds to the next dial peer in the sequence.
如果起始路由器接收到空号或目的地路由器的用户忙于编码，起始路由器就开始序列表中的下一个拨号点。
Gets the maximum update sequence number (USN) for which the destination server has accepted changes from the source server.
取得目的伺服器已接受的来源伺服器变更之最大更新序号(usn)。
Gets the maximum update sequence number (USN) for which the destination server has accepted changes from the source server.
取得目的伺服器已接受的来源伺服器变更之最大更新序号(usn)。
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