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Attempting to Send a Fax Triggers a Fast Busy Error Reply

Author: Luis Fernandes Updated

Overview

This article provides help with the scenario where sending a fax trigger a reply stating the fax failed with a Fast Busy error. You would see similar errors to the below:

  •  Error Class: 209715206 
  •  Error Code: 3253 
  •  Error Extra: 13458
  •  Error String: Fast Busy

Environment

  • GFI FaxMaker Online
  • All supported environment

Root Cause

A reorder tone, sometimes called a fast busy signal, indicates that no transmission path to the called number is available. This can occur either because the Inter-LATA trunk is busy at the time of the call- in which case this clears in a few seconds if one redials- or the number is temporarily out of service, due to maintenance or the number is not willing to accept calls. It is otherwise played after a recorded announcement explaining the reason for a general call failure.

Resolution

Please call the fax number in question that returns a busy fax tone. Ensure that you can hear a fax tone. If it is not and the tone sounds like a busy tone.

An otherwise unspecified busy signal indicates that the called number is occupied:

  • The called number is talking with another caller on the phone.
  • The number is calling out.
  • Someone else has called the number or is calling the number at the same time.
  • The other line was left off-hook.
  • It is otherwise unavailable.

The standard busy signal sometimes occurs (sometimes with an intercept message played over the busy) at the end of a call to indicate the other party has hung up, but mostly the off-hook tone is used. In some phone companies in the United Kingdom, the busy signal is played after the dial tone to indicate the caller has used up their allocated time to dial a number and must hang up, before the off-hook tone is played.

Other possible causes

Styles
  • Countries have different signaling tones that act as busy signals, in most cases consisting of a tone with equal on/off periods at a rate of between 60 and 120 interruptions per minute (i.p.m.).
  • In North America, the Precise Tone Plan used today employs two tones of 480 and 620 Hz at 60 i.p.m. (i.e. on for 0.5 s, off for 0.5 s). In the past, before the adoption of the Precise Tone system, the busy signal was generally composed of the same tone as dial tone in the central office in question, interrupted at the same rate.
  • In the United Kingdom, busy tone consists of a single 400 Hz tone with equal 0.375 s on/off periods. This tone was adopted in the mid to late 1960s and replaced the older busy tone, which was the same 400 Hz signal but at half the interruption rate (i.e. 0.75 s on, 0.75 s off).