精选优质文档-倾情为你奉上ISUP消息中常见rel原因值 ：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 changed(号码改变)26 Non selected user clearing(清除未选择的用户)27 Destination out of order(终点故障)28 Incomplete number(无效号码格式（不完全的号码）)29 Facility rejected(设施被拒绝)30 Response to status enquiry(对状态询问的响应)31 Normal
