Fax Delivery Result Codes

Advantage of Faxing

A primary advantage of sending documents via fax is the extra error checking and reporting available.

Fax works by sending information via a telephone call. During the call, each fax machine communicates to confirm pages were received successfully. If a fax is not received, the sender is alerted.

Technology behind sending a fax

To explain this process further, for every fax transmission there are a few stages:

1. Pre-processing of the fax message (TNZ preparing your fax for sending)
2. Call initiation (TNZ dialling the receiving fax number)
3. Call acceptance (the receiving fax machine answering the fax call)
4. Call negotiation (TNZ negotiating details with the receiving fax machine, eg Caller ID, sending speed, etc)
5. Transmission of data (your fax document being sent)
6. Confirmation of transmission (the receiving fax machine confirms the fax page was successfully received
7. Step 5 and 6 repeat individually for each fax page)
8. Completion of call (receiving fax machine acknowledges all pages have been successfully received)
9. Call ends

Once the fax transmission completes, the sender of the fax will be able to view a Delivery Report detailing the fax results. There are two parts to the Delivery Report:
Status outlines the overall outcome of the fax transmission (either "Success" or "Failed")
Result details a more specific outcome (eg "Sent OK" or "No Answer")

If there is a fax failure at any of the above steps, the Status may be "Failed" and the Result code will outline why.
Eg if the call fails at step 1, the Result will be something like 'Bad Number', whereas if the call fails at step 2, the Result will be something like 'No Answer'. 

Fax Result Codes and what these mean

A full list of Result Codes is as follows:

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