| 01 | Checksum error | |
| 02 | Syntax error | Error in the NPID parameter (SMS Message transfer) or in the PID parameter (SMT Alert). |
| 03 | Operation not supported by system | |
| 04 | Operation not allowed | Any internal error (e.g. no resources), often of temporary nature. If the RAd:s (number of addresses) parameter contained more addresses than the specified maximum, the System Message parameter will contain "too many addresses". |
| 05 | Call barring active | One of the addresses is on the blacklist. |
| 06 | AdC invalid | |
| 07 | Authentication failure | Authentication failure (PWD parameter in 60-series) |
| 08 | Legitimisation code for all calls, failure | |
| 09 | FA not valid | |
| 10 | Repetition not allowed | |
| 11 | Legitimisation code for repetition, failure | |
| 12 | Priority call not allowed | |
| 13 | Legitimisation code for priority call, failure | |
| 14 | Urgent message not allowed | |
| 15 | Legitimisation code for urgent message, failure | |
| 16 | Reverse charging not allowed | |
| 17 | Legitimisation code for rev. vharging, failure | |
| 18 | Deferred delivery not allowed | |
| 19 | New AC not valid | New AC not valid (NPWD parameter in 60-series) |
| 20 | New lgitimisation code not valid | |
| 21 | Standard text not valid | |
| 22 | Time period not valid | |
| 23 | Message type not supported by system | |
| 24 | Message to long | |
| 25 | Requested standard text not valid | |
| 26 | Message type not valid | |
| 27 | Message not found in smsc | |
| 30 | Subscriber hang-up | |
| 31 | Fax group not supported | |
| 32 | Fax message type not supported | |
| 33 | Adress already in list(60 series) | |
| 34 | Adress not in list(60 series) | |
| 35 | List full, cannot add address to list (60 series) | |
| 36 | RPID already in use | |
| 37 | Delivery in progress | |
| 38 | Message forwarded | |