| Bin | Cauase | Desc |
| 10 | 2 | IMSI unknown in HSS |
| 11 | 3 | Illegal UE |
| 101 | 5 | IMEI not accepted |
| 110 | 6 | Illegal ME |
| 111 | 7 | EPS services not allowed |
| 1000 | 8 | EPS services and non-EPS services not allowed |
| 1001 | 9 | UE identity cannot be derived by the network |
| 1010 | 10 | Implicitly detached |
| 1011 | 11 | PLMN not allowed |
| 1100 | 12 | Tracking Area not allowed |
| 1101 | 13 | Roaming not allowed in this tracking area |
| 1110 | 14 | EPS services not allowed in this PLMN |
| 1111 | 15 | No Suitable Cells In tracking area |
| 10000 | 16 | MSC temporarily not reachable |
| 10001 | 17 | Network failure |
| 10010 | 18 | CS domain not available |
| 10011 | 19 | ESM failure |
| 10100 | 20 | MAC failure |
| 10101 | 21 | Synch failure |
| 10110 | 22 | Congestion |
| 10111 | 23 | UE security capabilities mismatch |
| 11000 | 24 | Security mode rejected, unspecified |
| 11001 | 25 | Not authorized for this CSG |
| 11010 | 26 | Non-EPS authentication unacceptable |
| 100011 | 35 | Requested service option not authorized in this PLMN |
| 100111 | 39 | CS service temporarily not available |
| 101000 | 40 | No EPS bearer context activated |
| 101010 | 42 | Severe network failure |
| 1011111 | 95 | Semantically incorrect message |
| 1100000 | 96 | Invalid mandatory information |
| 1100001 | 97 | Message type non-existent or not implemented |
| 1100010 | 98 | Message type not compatible with the protocol state |
| 1100011 | 99 | Information element non-existent or not implemented |
| 1100100 | 100 | Conditional IE error |
| 1100101 | 101 | Message not compatible with the protocol state |
| 1101111 | 111 | Protocol error, unspecified |
