Troubleshooting: What to do if you have problems receiving and making calls from a landline?

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Are you having problems with your landline? Then see our advice below:



1. If your phone no longer works on a very high speed connection (VDSL or Optical Fiber)

  • Reboot your FRITZ!Box
  • Make sure your phone is connected to your FRITZ!Box on port FON1 or FON2
  • Test with another phone by plugging it into the FON1 or FON2 port


If your landline is connected to a FON port different from the one present in your FRITZ!Box, reconnect the line to the correct port and carry out a test.

2. Your phone no longer works on an ADSL connection

  • Check that, on each telephone socket, you have installed an ADSL filter supplied with your modem. Without a filter, the line may be distorted or even non-existent.


3. Poor call quality

  • Check the environment around your box (certain objects can disrupt the quality of your FRITZ!Box, such as your telephone).
  • Reboot your FRITZ!Box
  • Change your landline phone


For step-by-step troubleshooting, follow the Tango chat 🤖

Just type “Landline issue” and follow the guide! 

Chat is available 24/7 and can put you in direct contact with one of our help desk staff (Monday to Friday from 9 a.m. to 6 p.m. and Saturday from 9 a.m. to 5 p.m.) if required.

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