FRITZ!Box 7272 Service - Knowledge Base

FRITZ!Box 7272 Service

Cannot register a cordless telephone

The registration of a cordless telephone fails. The following error message is displayed in the FRITZ!Box user interface:

  • "Registration with the DECT base station failed. The reason for the error is displayed on the cordless (DECT) telephone."

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

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

1 Maximum number has been reached

You can register a maximum of six cordless telephones with the FRITZ!Box. If six telephones are already registered, you cannot register any additional telephones.

Note:You can delete telephones that you are not longer using under "DECT > Cordless Telephones" in the FRITZ!Box user interface.

2 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.

3 Disabling the keylock

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Buttons and LEDs" in the "System" menu.
  3. Click on the "Keylock" tab.
  4. Disable the keylock.
  5. Click "Apply" to save your settings.

4 Checking whether the telephone supports DECT-GAP

The telephone must support the DECT-GAP profile. DECT-GAP is a common standard for cordless telephones and wireless data transmission supported by all FRITZ!Fon models, for example.

  • Check the telephone's manual or ask the manufacturer to find out whether the telephone supports the DECT-GAP profile.
    • If the telephone does not support DECT-GAP, we do not guarantee that it will function with the FRITZ!Box.

5 Disabling "DECT Eco"

  1. Click "DECT" in the FRITZ!Box user interface.
  2. Click "Base Station" in the "DECT" menu.
  3. Disable the option "DECT Eco" in the "Radio field strength" section.
  4. Click "Apply" to save your settings.

Do not re-enable the "DECT Eco" option until you have successfully registered the telephone with the FRITZ!Box.

6 Setting a PIN

You may be using an incorrect PIN to register the telephone with the FRITZ!Box. Therefore, set a new PIN for the FRITZ!Box's base station:

  1. Click "DECT" in the FRITZ!Box user interface.
  2. Click "Base Station" in the "DECT" menu.
  3. Enter a four-digit PIN in the "Registration" section.
  4. Click "Apply" to save your settings.

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

8 Resetting FRITZ!Box and using the Wizard to register the telephone

Certain FRITZ!Box settings could be preventing the telephone from being registered. Therefore, restore the FRITZ!Box to factory settings and then use the Wizard for telephony devices to register the telephone with the FRITZ!Box:

Saving the FRITZ!Box settings

Saving the FRITZ!Box telephone books

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Book" in the "Telephony" menu.
  3. Select a telephone book, click the "Save" button and save the telephone book as an XML file on your computer.
  4. Repeat these steps to save each of the telephone books configured in the FRITZ!Box.

Loading the FRITZ!Box factory settings

Using the Wizard for telephony devices to register a telephone

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the "Configure New Device" button.
  4. Enable the option "Telephone (with or without answering machine)" and click "Next".
  5. Enable the option "DECT (cordless telephone)" and click "Next".
  6. Start the registration procedure on the telephone, then click "Connect" and follow the instructions.
  7. If you are asked for the PIN of the base station, enter 0000 on your telephone. This is the factory setting of the FRITZ!Box.

    Note:You do not have to push the "DECT" button on the FRITZ!Box when using the Wizard for telephony devices to register the telephone.

    • If you could successfully register the telephone with the FRITZ!Box:
      • Import the telephone books that you saved and reconfigure the FRITZ!Box.

        Important:Do not restore the settings saved in the file "fritzbox[...].export" as this may cause the registration of further cordless telephones to fail again.

9 Testing a different telephone

Test whether you can register a different cordless telephone with the FRITZ!Box. Use a telephone that supports the DECT-GAP standard:

  1. Restore the FRITZ!Box settings.
  2. Use the Wizard for telephony devices to register the other cordless telephone with the FRITZ!Box.
    • If you can successfully register the other cordless telephone with the FRITZ!Box, then the first telephone is either incorrectly configured or defective.