说明: 1 Unassiagned number(未分配的号码(空号)) 3 No route to destination(无至目的地的路由) 6 Channel unacceptable(不可接受的信道) 16 Normal clearing(正常清除) 17 User busy(用户忙) 18 No user responding(无用户响应) 19 User alerting,no answer(已有用户提醒,但无应答) 21 Call rejected(呼叫拒绝) 22 Number cha
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