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Knowledge document #73

Telephone connected to FRITZ!Box is dead

When you pick up the handset of a telephone connected to an analog extension of the FRITZ!Box, it does not make a sound (for example a dial tone or busy signal). The telephone is "dead".

Simply proceed as described below. After each measure, check whether the problem is solved.

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

1 Plugging the FRITZ!Box in

  1. Plug the FRITZ!Box into a power outlet where other devices work.

2 Installing the latest FRITZ!OS for the FRITZ!Box

  1. Install the latest FRITZ!OS on the FRITZ!Box.

3 Setting up an analog telephone

Using only one connection option

The "FON" socket has two options for connecting devices: You can either use the RJ11 socket on the back or the TAE socket on the side of the FRITZ!Box. You can only use one connection option at a time:

  1. If you connected devices to both of the sockets for the same extension, disconnect one of the devices from the FRITZ!Box.

Testing a different analog telephone

  1. Disconnect the telephone from the FRITZ!Box.
  2. Connect a different telephone to the same socket on the FRITZ!Box.
  3. If you hear a sound, then the first telephone is defective or the telephone cable is damaged or incorrectly wired. Test a different cable or contact the manufacturer of the telephone.
    • If you do not hear a sound, check whether the plug of the telephone is correctly wired. The two inner pins carry the analog signal of the RJ11 socket "FON" on the back of the FRITZ!Box.

4 Restarting the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" in the "System" menu.
  3. Click on the "Restart" tab.
  4. Click the "Restart" button.
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