Fax Error Codes
Fax Error Codes
Section titled “Fax Error Codes”When an outbound fax fails, SIPSTACK shows the reason with an error code, such as (Error FAX-102). You see it on the fax in the inbox, in the failure notification and in the failure email.
The codes are grouped by where the send stopped:
- FAX-1xx: the call never reached a fax machine.
- FAX-2xx: a fax machine answered, but the transfer did not finish.
- FAX-3xx: a problem with the document or the number you sent from.
- FAX-9xx: a problem on our side.
Outbound faxes are attempted once and are not retried automatically. To try again, send the fax again from the inbox.
Error codes
Section titled “Error codes”| Code | Meaning | What you can do |
|---|---|---|
| FAX-101: No answer | The receiving number did not answer. | Check the fax number and that the receiving fax machine is switched on, then send again. |
| FAX-102: Busy | The receiving number was busy. | Wait a few minutes and send again. |
| FAX-103: Call not completed | The call to the receiving number could not be completed. | Check that the number is correct and can receive calls, then send again. If it keeps happening, contact support with this code. |
| FAX-201: No fax machine detected | The call was answered, but no fax machine responded. | Make sure the number belongs to a fax machine and not a person or voicemail, then send again. |
| FAX-202: Fax negotiation failed | The receiving fax machine answered, but the two machines could not agree on how to send the fax. | Send again. If it keeps happening, ask the recipient to check their fax machine settings. |
| FAX-203: Retries exceeded | The receiving fax machine did not accept the pages after several attempts, so the transfer was stopped. | Send again later. If it keeps happening, ask the recipient to check their fax machine (paper, memory and line). |
| FAX-204: Receiver disconnected | The receiving fax machine hung up before the fax was complete. | Check the page count shown on the fax. Ask the recipient what arrived, then send again. |
| FAX-205: Time limit reached | The fax did not finish within the 20-minute limit and was stopped. | Ask the recipient what arrived. For a long document, split it into smaller PDFs and send each one. |
| FAX-301: Document could not be faxed | The document could not be prepared for faxing. | Check that the file is a valid PDF that is not password-protected, then send it again. |
| FAX-302: Sending number unavailable | The number this fax was sent from is no longer available for faxing on your account. | Choose another fax number in From and send again. |
| FAX-901: Temporary service problem | We could not send this fax because of a temporary problem on our side. The fax was not sent. | Send again in a few minutes. If it keeps happening, contact support with this code. |
| FAX-902: Delivery not confirmed | We could not confirm whether this fax was delivered. It may have been sent. | Check with the recipient before sending it again, so they do not receive it twice. |
Contacting support
Section titled “Contacting support”If an error keeps happening, open a ticket and include:
- the error code,
- the number you sent to,
- the time you sent the fax.
The code tells our team where the send stopped, so they can find the cause quickly.