My telephone stopped working when I got an ADSL connection

There are several ways to resolve this problem.

  1. Make sure you have installed an ADSL filter (provided with your modem) on each telephone socket. Without the filter the line can be scrambled or non-existent.
  2. You may have an installation with crossed cables. In that case, refer to the FAQ on the installation of your Fritzbox (Installation and start up / Installing my FB).
  3. If you still have a problem, call our Customer Service on 800 777 77.
My telephone stopped working when I got a connection with high to very high speed (VDSL or fiber)

You can carry out these checks:

  1. Check if your telephone is connected to your Fritzbox on a Fon1 or Fon2 port.
  2. Connect to the interface of your Fritzbox and in "Overview" check if the Telephony button is green and indicates your fixed line. 
  3. Follow this path:   ==> Telephony ==> Telephony peripheral on which your fixed line is connected  (Fon 1 or Fon 2);
  4. Your fixed line is connected to a different Fon port than the one in your Fritzbox: connect the line to the right port and do a test.

If you use a DECT telephone:
    In the Fritzbox interface  (menu) under "Overview", check if the Dect button is green.
       -> If the Dect button is green, re-sync your telephone handset with your Fritzbox.
       -> If the Dect button is grey, call our Customer Service on 800 777 77.

Problems with call quality

If the quality of your calls is poor:

  1.  Check the environment around your box (certain objects can affect the quality of your Fritzbox, e.g. a mobile phone).
  2.  Reboot your Fritzbox.
  3.  Change your fixed telephone.

If that doesn't help, call our Customer Service on 800 777 77.