Receive DLRs
Status Values
For delivery receipts forwarded by the SMPP Server, the stat sub-field value of short_message field may have one of the values defined in the following table.
| stat value | esm_class value | Description |
| ACCEPTD | 0x20 | The message has been accepted by the upstream carrier. |
| BUFFRED | 0x20 | The message is currently with the carrier and in pending status |
| NOCRED | 0x4 | Your SMS Central account has exceeded its credit limit (no credit). |
| DELETED | 0x4 | The message has been deleted at the carrier level and will not be delivered. |
| DELIVRD | 0x4 | Message was delivered. |
| ENROUTE | 0x20 | Message is en route, ie is still being routed to the mobile phone. |
| EXPIRED | 0x4 | Carrier has given up trying to deliver the message. |
| REJECTD | 0x4 | Carrier rejected the message. |
| SYSERR | 0x4 | An error has occurred at the carrier level and the message could not be delivered (system error). |
| UNDELIV | 0x4 | The message could not be delivered. The err sub-field should be consulted for further explanation - refer to Error Codes section for a detail on the sub-field. |
| FAILED | 0x4 | The message could not be delivered and has failed at the carrier level. The err sub-field should be consulted for further explanation - refer to Error Codes section for a detail on the sub-field. |
| UNKNOWN | 0x4 | The message has been sent to the carrier and is in an unknown state (no further information provided by the carrier). It is likely to not delivered. |
The esm_class value of 0x20 indicates that the delivery receipt is intermediate - a further receipt should follow.
The esm_class value of 0x4 indicates the delivery receipt is final.
Error Codes
The following table lists the possible err sub-field values which may be returned by the SMPP server in delivery receipts.
| err value | Description |
| 0 | Success; Message has been sent, delivery confirmation is pending |
| 1 | Success; Message has been successfully delivered |
| 500 | Failed; Internal SMS Central Server Error |
| 503 | Failed; Message has expired within the carrier |
| 511 | Rejected; Your username or password is incorrect |
| 513 | Rejected; Message rejected due to being a duplicate message |
| 514 | Rejected; No ‘RECIPIENT’ value was provided |
| 519 | Rejected; The number you tried sending to is blacklisted |
| 531 | Rejected; Your message contains no content |
| 532 | Rejected; Your message content has invalid characters. Please check your message text |
| 534 | Rejected; Credit limit exceeded. You have run out of SMS credit |
| 535 | Rejected: Your ‘ORIGINATOR’ value is not valid |
| 536 | Notice: Your message has been temporarily delayed |
| 550 | Failed: Message could not be delivered by carrier |
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