FRITZ!Fon MT-F – Service - Knowledge Base

FRITZ!Fon MT-F – Service
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FRITZ!Fon restarts frequently

The FRITZ!Fon restarts frequently. The restarts occur repeatedly, for example when conducting calls, listening to messages on the answering machine, or playing music files from the FRITZ!Box media server.

Simply proceed as described below. After each measure, check whether the issue persists.

1 Installing the latest software for your telephone

2 Resetting the telephone and re-registering all telephones

The problem may be caused by inconsistent settings in the FRITZ!Box or the FRITZ!Fon, for example due to repeatedly registering and deregistering the telephone or after updating the software. Therefore, restore the FRITZ!Fon to factory settings and then use the wizard for telephony devices to re-register all cordless telephones to the FRITZ!Box:

Deleting telephones

  1. Click "DECT" in the FRITZ!Box user interface.
  2. Click "Cordless Telephones" in the "DECT" menu.
  3. Click the corresponding button (Delete) to delete all of the cordless telephones that are registered.

Restoring the telephone to its factory settings

  1. Press the "Menu" key on the telephone.
  2. Scroll to "Settings" and press "OK".
  3. "Reset" > "OK" > "OK"

Turning telephones off

  • Turn all of the cordless telephones off.

Restarting the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" or "Reset" in the "System" menu.
  3. Click on the "Restart" tab (if available).
  4. Click the "Restart" button.

Re-registering all telephones