title: Twilio Fax API - how to get the failure reason for failed fax send
body: <p>Hi all (especially Twilio evangelists out there)</p>
  
  <p>I've connected my EMR app to Twilio in order to send faxes, and it works reasonably well, however there's one big problem I'm running into. Some faxes fail to send, and I can't find the reason for it. If the line is busy, or if there's no answer, Twilio marks the fax instances accordingly, and I can attempt a retry or whatever. But in some circumstances I do not understand, a sent fax immediately comes back as Failed through the webHook. So it gets "queued", but the first message I receive from the webHook is FAILED - no additional data whatsoever.</p>
  
  <p>I've tried checking the developer tools Debugger, but there nothing there - it's 100% blank (checked last 30 days). I know from my test account that I should find the failure reason there, if there's something wrong with my implementation (e.g., if Twilio can't fetch my PDF, or I don't provide the "from" number, etc). But on production account, it's empty.</p>
  
  <p>Faxes that I send to myself (Toshiba multifunction) work just fine, report busy when busy, etc. But the faxes sent to other companies fail, though I'm quite sure the numbers are OK. I was wondering if anybody can make a list of the possible reasons for a fax to fail? And I was also wondering why Twilio doesn't send more details on Failed faxes, it would be very helpful to know what happened from my logs...</p>
  
  <p>Thanks,
  Vic</p>