In this case, I rely on the server setting a special HTTP header named X-Ticket-Sequence-Number, which holds the unique identifier for the ticket the user is constructing.
在本例中，我依靠服务器设置一个名为X - Ticket - Sequence - Number的特殊HTTP头部字段。这个字段中保存的是用户正在构造的故障单的唯一标识。
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。
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