To resolve this problem:

  1. Make sure the phone number you are faxing to is a valid, available fax number.
  2. Send the fax again.

If the fax number is available for faxing, but the problem continues:

  1. Set Disable Call Waiting to Noif you do not have call waiting service:
    • From your telephone, dial (press) *70.
      You should hear a busy signal to indicate that you do not have call waiting.
  2. Press Home on your printer control panel. 
  3. Press the down arrow button to select Fax Settings.
  4. Press the down arrow button to select Disable Call Waiting.
  5. Make sure that Disable Call Waiting is set to No.
  6. Send your fax again.