GSM系统CC层定义的原因值(cause value)(Um)0408.doc

GSM系统CC层定义的原因值 1 Normal class 1.1 Cause No. 1 unassigned (unallocated) number（未分配的号码） This cause indicates that the destination requested by the mobile station cannot be reached because, although the number is in a valid format, it is not currently assigned (allocated). 1.2 Cause No. 3 no route to destination（目的地无路由） This cause indicates that the called user cannot be reached because the network through which the call has been routed does not serve the destination desired. 1.3 Cause No. 6 channel unacceptable（信道无法接受） This cause indicates the channel most recently identified is not acceptable to the sending entity for use in this call. 1.4 Cause No. 8 operator determined barring（操作者定义禁止） This cause indicates that the MS has tried to access a service that the MSs network operator or service provider is not prepared to allow. 1.5 Cause No.16 normal call clearing（正常的呼叫清除） This cause indicates that the call is being cleared because one of the users involved in the call has requested that the call be cleared.Under normal situations, the source of this cause is not the network.（一搬是用户挂机，而不是网络问题） 1.6 Cause No.17 user busy（用户忙） This cause is used when the called user has indicated the inability to accept another call. It is noted that the user equipment is compatible with the call. 1.7 Cause No. 18 no user responding（用户无响应） This cause is used when a user does not respond to a call establishment message with either an alerting or connect indication within the prescribed period of time allocated (defined by the expiry of either timer T303 or T310). 1.8 Cause No. 19 user alerting, no answer（用户振铃，无应答） This cause is used when a user has provided an alerting indication but has not provided a connect indication within a prescribed period of time. 1.9 Cause No. 21 call rejected（呼叫拒绝） This cause indicates that the equipment sending this cause does not wish to accept this call, although it could have accepted the call because the equipment sending this cause is neither busy nor incompa