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A fax arrives while it is being sent: the recipient's machine starts printing as your pages transmit, so a short fax is effectively there when the call ends. The real time goes to dialing, the handshake tones, and redialing if the line is busy. Most fax delays come from busy signals or wrong numbers, not from slow transmission.
A fax call has four phases:
Busy signals. If the recipient's line is in use, most fax machines and online fax services redial automatically, usually a few times with a pause between attempts. A line that stays busy through every retry produces a failed-transmission report, and you try again later. Other slow-downs have nothing to do with the phone network: a paper jam or an empty paper tray at the receiving end stalls the whole thing, and the sender's machine cannot tell you about it. A wrong number that reaches a voice line is another classic: nobody picks up as a fax, the call times out, and you get a "no answer" report.
Page count matters most. A one-page fax is a single short call; a twenty-page document holds the line much longer, and every page is another chance for a line glitch to interrupt. Dense pages slow things down too: a page of solid graphics carries far more image data than a page of plain text, so it takes longer to send. Line quality matters as well: fax machines deliberately slow their transmission speed on noisy lines, trading speed for accuracy, and error-correction mode retransmits garbled lines rather than letting them print wrong. None of this is dramatic: the difference between a fast line and a slow one is the difference between a quick call and a somewhat longer one.
The phone-network part works the same, but internet fax adds handoffs: your document uploads to the provider's servers, then goes out over phone lines for the last leg. That usually adds seconds, not minutes. The bigger internet-fax issue is reliability, not speed: voice-over-IP lines compress audio in ways that can corrupt fax tones, so some providers route around VoIP for the actual call. If your online fax keeps failing to one particular number while others go through fine, the recipient's line setup is the usual suspect, not your document.
| Report | What it means | What to do |
|---|---|---|
| OK / transmitted | All pages went through; the report lists the time, number, and page count | Keep it as your proof of sending |
| Busy | The recipient's line was in use through every redial attempt | Try again later; mornings are often less busy than mid-afternoon |
| No answer | Nothing picked up as a fax: wrong number, voice line, or machine off | Verify the fax number before resending |
| Error / line failure | The call dropped mid-transmission | Resend; if it repeats, the line quality on one end is the problem |
LetterAgent's fax option is currently in testing: you describe the document to your AI assistant, get a per-fax quote with the page count verified, and approve the exact total before anything is sent. Faxes go to US and Canadian fax numbers only, and there are no inbound faxes. Pricing is quoted up front, and you pay once through Stripe.
Ready to fax it? Fax with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is sent.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
Need help? Ask your assistant: it can check a job's status any time. If it ever can't handle something: hello@getletteragent.com