# Postback notification codes

This document details the postback notification codes of the MMS JSON API.

| Code | Description |
|  --- | --- |
| N101 | Notification that MMS was sent. |
| N102 | Notification that MMS status was updated. |
| N103 | Notification that MMS expired. |
| E101 | Error occurred. Impossible to send MMS. |
| E102 | Error occurred. MMS Delivery wasn't successful. |
| E002 | Encoding of MMS audio failed. (saveMMS function) |
| E003 | Encoding of MMS video failed. (saveMMS function) |
| E004 | Encoding of MMS image failed. (saveMMS function) |
| E011 | Content validation failed. |
| E012 | Encoding of MMS audio failed. (sendMMS function) |
| E013 | Encoding of MMS video failed. (sendMMS function) |
| E100 | Invalid request, please make a valid Post request. |
| E202 | Error occurred. MMS as SMS Delivery wasn't successful. |
| E999 | Post Message Sending Queue Processing Errors. |
| N013 | Transcoding successful. |
| N202 | Notification that MMS was delivered as SMS. |
| N401 | MMS MO received successfully. |