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。
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。
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.
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