| Connection failed | There was no receiver on the other end of the call to connect to. |
| Document generation error. | There was an error while generating the document. This could be due to the file being deleted before sending. |
| Failed to train with any of the compatible modems | A remote fax machine was detected, but the sending and receiving modems could not establish communication. |
| Fax transmission not established | We could not detect a remote fax machine. This could be due to there being no fax machine on the receiving end, or a lack of call clarity. |
| Log entry lost | The call started, but the log entry for the call was lost / incomplete. In practice, this should be rare and may indicate a system problem. |
| No response after sending a page | The remote fax machine did not acknowledge that a page of the fax was received. Depending on the remote machine's behaviour, it may have still printed the page and any preceding pages. |
| Received no response to DCS or TCF | The fax service could not successfully determine the remote machine's fax capabilities. |
| The call dropped prematurely | The call dropped due to a non-fax transmission error. It is likely that the receiver hung up. |
| The HDLC carrier did not stop in a timely manner | The fax service initiated a fax transmission with the receiver, but there was a synchronization (timing) error that could not be resolved. |
| Timed out waiting for initial communication | A call was established with the receiver and the bulk fax service attempted to establish a fax session, but there was no fax response from the receiver. This could be due to there being no fax machine on the receiving end, or a lack of call clarity. |
| Timed out waiting for the first message | A call was established with the receiver and the fax service attempted to establish a fax session, but there was no fax response from the receiver. This could be due to there being no fax machine on the receiving end, or a lack of call clarity. |
| Unexpected DCN while waiting for DCS or DIS | The remote fax machine unexpectedly sent a disconnect message when the fax service asked for the remote fax machine's fax capabilities. |
| Received bad response to DCS or training | An unexpected message was received when the bulk fax service asked for the remote fax machine's fax capabilities. |
| Invalid response after sending a page | An unexpected message was received after successfully sending a page. Depending on the remote machine's behaviour, it may have still printed the sent page and any preceding pages. |
| Disconnected after permitted retries | The fax service attempted to send the same message multiple times unsuccessfully. This may be due to a call clarity issue. |
| Far end cannot receive at the resolution of the image | The remote fax machine does not support receiving faxes sent at the resolution that our service sends at. |
| Received a DCN from remote after sending a page | The remote fax machine responded with a disconnect message after a page was sent successfully. Depending on the remote machine's behaviour, it may have still printed the sent page and any preceding pages. |
| Unexpected message received | The fax service received a message that it did not expect given the current context. |
| Received other than DIS while waiting for DIS | The fax service expected to receive the remote fax machine's fax capabilities, but received an unexpected message instead. |
| Unexpected DCN after EOM or MPS sequence | The remote fax machine disconnected unexpectedly after receiving a page of a multi-page fax. Depending on the remote machine's behaviour, it may have still printed the sent page and any preceding pages. |
| Document loading error. | The fax service attempted to generate the message to send, but a document was missing. |
| Invalid ECM response received from receiver | The fax service received an invalid error correction message from the remote fax machine. |
| Unexpected DCN after RR/RNR sequence | The remote fax machine disconnected unexpectedly after indicating that it was not ready to initiate a fax session. |