Summary
Most often in the number itself: a typing error, a reassigned line, or a correspondent who answers with a voice. Then come the machine that is off, jammed or short of paper, then lines passed through internet boxes, which damage the signal. Check the number, wait a little, try again.
The causes, in order of frequency
In first position, the number: a typing mistake, a reassigned line, or an extension from which a voice or a voicemail emerges. On the other end, a fax demands a machine capable of picking up and "whistling" back. Then come the line already busy, the absence of an answer, the device out of power or empty of paper.
Connections switched to internet boxes explain a growing share of failures: codecs designed for speech compress the fax tones and make them unrecognisable. That setting is corrected on the correspondent's side, not from your screen.
Reading the tracking verdict
The tracking page, updated every five seconds, unrolls the stages up to the final verdict. Faced with a failure, the receipts option is not charged: it only is on actual delivery.
Before relaunching the send
Refer to a recent source and comb the number thoroughly, digit by digit; check too that the country chosen is the right one. Busy line? Let the time of office hours pass, which concentrates the attempts. Repeated failure? Call the correspondent: they will confirm the number and how their machine is doing.
A PDF weighed down by photos or dark blocks slows the transmission and makes it fragile; a lightened version, in well-contrasted black and white, more readily passes in one go.
Key points
- First cause: a false number, or one occupied by a voice.
- Busy line, machine without paper, boxes that scramble the signal.
- Tracking shows the failure, and the receipts option stays free.
- Check number and country, wait, then reach the correspondent.