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Dokument informacyjny #3383

FRITZ!Box reports "Username already used"

It is not possible to delete entries for IP telephones, for example FRITZ!App Fon, from the list of telephony devices. When you try to delete them, the following error message is displayed:

"An error occurred. Error description: Username already used. Please enter your data again. If the error occurs again, please consult AVM Support."

Cause

  • The FRITZ!Box's telephony settings are inconsistent.

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Saving settings

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" in the "System" menu.
  3. Click on the "Save" tab.
  4. Enter a password.

    Tip:Keep the password in a safe place! The backup file can be used only after the password has been entered.

  5. Click "Save" and confirm that the procedure may be executed on the FRITZ!Box, if you are asked to do so.
  6. Save the file "Settings_FRITZ.Box[...].export" on your computer. If the browser blocks the file download, click "Keep" in Microsoft Edge and Chrome.

2 Loading the factory settings

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" in the "System" menu.
  3. Click on the "Factory Settings" tab.
  4. Click the "Load Factory Settings" button.
  5. During this process, all of the LEDs flash once. The WLAN LED remains lit as soon as the factory settings have finished loading.

3 Restoring settings

Now you can restore all of the settings except for the telephony settings. Afterward, you must manually reconfigure the telephony functions:

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" in the "System" menu.
  3. Click on the "Restore" tab.
  4. Click the "Browse..." or "Choose File" button.
  5. Select the file "Settings_FRITZ.Box[...].export" with the settings you want to restore.
  6. Enter the password you entered when saving the file.
  7. Enable the option "Select manually the settings to be restored".
  8. Click the "Restore" button and on the FRITZ!Box, confirm that the procedure may be executed, if you are asked to do so.
  9. Enable the option "Select all settings".
  10. Disable the option "Overwrite all telephone numbers and telephony settings".
  11. Click "Apply".
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