Cause of Block call : No Alerting or connect

[wola44]

Dears,

Please what is the cause of the ff block call on 3G network:

1.Block call with No Alerting or connect ?
2.Block call : N0 RRC connection setup ?
3.Block call: Abnormal RRC connection ?
4. Block call: No MM connection available ?
5. Block call : No Radio bearer setup ?


Thanks , Waiting for your answers.