Failed deliveries may include an additional error code in the delivery receipt in order to give more information about the failure. The table below shows the TeletopiaSMS specific SMPP error codes.
| 0x00 | OK |
| 0x20 | BARRED |
| 0x21 | BARRED_SUBSCRIBER_ACCOUNT_BARRED |
| 0x22 | BARRED_SUBSCRIBER_ACCOUNT_CLOSED |
| 0x30 | ACCESS_FAILED |
| 0x40 | INVALID_MESSAGE |
| 0x41 | INVALID_MESSAGE_INVALID_DESTINATION_ADDRESS |
| 0x42 | INVALID_MESSAGE_INVALID_ORIGINATOR_ADDRESS |
| 0x45 | INVALID_MESSAGE_INVALID_CONTENT |
| 0x50 | GATEWAY_ERROR |
| 0x51 | GATEWAY_ERROR_ROUTE_NOT_FOUND |
| 0x52 | GATEWAY_ERROR_MESSAGE_REJECTED |
| 0x53 | GATEWAY_ERROR_OPERATOR_SUBMIT_ERROR |
| 0x54 | GATEWAY_ERROR_WRONG_OPERATOR |
| 0x55 | GATEWAY_ERROR_UNDELIVERABLE (usually unknown user) |
| 0x60 | EXPIRED |
| 0xFF | EXPIRED |