As we all know that post DLT activation a large number of SMS sent may get failed in case there is any DLT error, Against each SMS we get a status response from the operator with the error code in case of SMS.
To help you identify error codes and to identify reasons for failures here is a list of common error status received with a suitable description.
| STATUS | DESCRIPTION |
| ABSENT-SUB | Telecom Operators are not providing service for a particular number. / Mobile Subscriber not reachable. |
| EXPIRED |
SMS expired after multiple re-try. |
| HEADER-NOT-REGISTERED | The Sender ID used along with the template ID do not match as per the registration in the DLT portal |
| INVALID TEMPLATE | The Template id received is in the wrong format or there is no Template id tag |
| INVALID-SUB |
The number does not exist. / Failed to locate the number. |
| REJECTED |
SMS Rejected as the number is blacklisted by the operator. |
| REJECTED-MULTIPART |
Validation fails [SMS over 160 characters] |
| SENDER NOT MATCHED | Sender ID does not match with headers configured against Entity ID (PE ID) |
| TEMPLATE-BLACKLISTED | The message template pushed has been blacklisted at the DLT platform level |
| TEMPLATE-INACTIVE |
The message template sent is in an inactive status at the DLT platform level. |
| TEMPLATE-NOT-MATCHED |
The template does not match the template registered on the DLT platform |
| TEMPLATE-VARIABLE-EXCEEDED-MAX LENGTH |
The variable content sent exceeds the allowed limit (30 characters) |
| NDNC REJECTED |
DND registered number. |
| MESSAGE INBOX FULL |
Recipient’s inbox is full. |
| SNDR-INACTVE |
Sender ID is in inactive status at the DLT platform level. |
| SNDR-NT-REG |
Sender ID is not registered in the DLT system |
| BLACKLIST |
Blacklisted number. |