FRITZ!Box 6490 Cable Service - Knowledge Base

FRITZ!Box 6490 Cable Service

Loud background noise when using a DECT repeater

As soon as a DECT Repeater is registered with the FRITZ!Box, you can hear loud background noise when conducting calls with a cordless telephone.

Here we show you how to correct this issue if you are using an additional FRITZ!Box as the DECT repeater. If you are using a FRITZ!DECT Repeater, proceed as described in this guide to resolve the issue.


  • The DECT repeater is not properly connected or it was not positioned correctly.

1 Deregistering a repeater

  1. Click "DECT" in the user interface of the DECT base station.
  2. Click "DECT Monitor" in the "DECT" menu.
  3. Click on an entry that corresponds to a repeater.
  4. Click the button (Delete).
  5. Delete all of the registered repeaters in the same manner.

2 Re-registering a repeater