Please note that this is a guide for the most common Error Codes: reasons for non-delivered documents. 
Please contact Message Stick's Sales & Support Office, which can be found on the tab "Contact Us" on the homepage, for further assistance if the code on your Success Report does not appear below.
| SENT | Fax was successfully sent. | 
| BUSY | Line gave busy signal with all retries. The receiving fax machine was busy. | 
| NOAN | Phone keeps ringing. Nobody answers. If you are sure that the number is correct, please contact the recipient. There may be a problem with their fax machine (e.g. out of paper). | 
| INVD | The number is not a valid number. Please check the number and dial again. | 
| NOLN | Problem with phone line. Please check line. | 
| BARR | Wrong number (number changed, call barred). | 
| OPTO | Number opted out. | 
| NSUP | Service or Function not supported by network or user. | 
| COLL | At the moment we started trying to send a fax a call came in. | 
| ERR | Procedural or unknown error. | 
| FAIL | Document conversion failed. Please resubmit your document. | 
| NOFX | No fax machine detected. Please check the number and try again. | 
| PAGC | No confirmation received after last page transmitted. The fax may have been received by the recipient and the machine failed to confirm. | 
| BADC | Bad connection or fax modem error at receiving end. | 
| HNUP | Call disconnected by the network or remote user (reason unspecified). | 
| LDTE | Latest Delivery timeout expired. | 
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| SENT | Message was successfully sent. | 
| BSIN | Line busy or incorrect number. | 
| MGNC | Receipt of message not confirmed. | 
| RJCT | The message has been rejected. | 
| ERR | Procedural or unknown error. | 
| HNUP | Call disconnected by the network or remote user (reason unspecified). | 
| NOLN | Problem with phone line. Please check line. | 
| NOAN | Phone keeps ringing. Nobody answers. | 
| LDTE | Latest Delivery timeout expired. | 
| OPTO | Destination opted out. | 
| SENT | Message was successfully sent to network. | 
| QUED | Message queued for delivery. | 
| FAIL | Message couldn't be delivered, destination unavailable. | 
| RECE | Error in destination number, please check the number. | 
| SVRE | Error in the SMS delivery pathway, delivery failed. | 
| BARR | Destination blocked or forbidden. | 
| OPTO | Destination opted out. | 
| INVN | The number is not a valid number. Please check the number and dial again. | 
| BADS | The sender ID is invalid. | 
| EXPD | The message could not be deliverd in the requested delivery period. |