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Knowledge Base document #3702

Setting up the FRITZ!Box for use with a fibre optic connection from o2

The FRITZ!Box is optimally prepared for use with a fibre optic connection from o2. Simply connect it to the fibre optic modem from o2 and enter your personal account information in the FRITZ!Box user interface.

The complete FRITZ!Box range of functions for internet, telephony, and smart home is then available to all of the devices in your home network without restriction.

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

1 Having your account information ready

  1. Have your personal account information for internet access and the login information for telephony that you received from o2 ready.

    Note:You will find your account information in the o2 customer portal at www.o2online.de/mein-o2/zugangsdaten. If your account information is not displayed there, contact o2.

2 Connecting the FRITZ!Box

  1. Insert one end of a network cable into the 'WAN' port on the FRITZ!Box. Use the network cable supplied with the FRITZ!Box, for example.
  2. Insert the other end of the network cable into the LAN port on the fibre optic modem (ONT, Optical Network Termination).

3 Configuring the internet connection in the FRITZ!Box

  1. Open the FRITZ!Box user interface.
  2. Enter the FRITZ!Box password given on the type label of the FRITZ!Box and click on 'Log In'.
  3. Click on 'Internet' and then on 'Account Information'.
  4. Select 'DSL or fibre optic modem' from the 'Internet connection via' drop-down list.
  5. Select 'o2'.
  6. Enter the account information you received from o2 in the relevant fields.
  7. Click on 'Apply' to save the settings.
  8. Now the FRITZ!Box checks whether the internet connection can be established. Configuration is complete as soon as the message 'The internet connection check was successful' is displayed.

    Important:If the internet connection check fails, your internet access may not have been activated yet. In this case, contact o2.

4 Setting up telephony in the FRITZ!Box

Configuring phone numbers

  1. Click on 'Telephony' in the FRITZ!Box user interface.
  2. Click on 'Phone Numbers' in the 'Telephony' menu.
  3. Click on the 'New Phone Number' button.
  4. Select 'o2' from the drop-down list.
  5. Enter your area code and phone number by 'Telephone Number'.
  6. Enter the login information you received from o2 by 'SIP username' and 'SIP password'.
  7. Click on 'Next' and follow the wizard's instructions.

Assigning phone numbers

  1. Click on 'Telephony' in the FRITZ!Box user interface.
  2. Click on 'Telephony Devices' in the 'Telephony' menu.
  3. Click on the (Edit) button for the respective telephony device.

    Important:If the telephony device was not configured yet, click on the 'Configure New Device' button and follow the wizard's instructions.

  4. From the 'Outgoing Calls' drop-down list, select the number to be used by the telephony device for making outgoing calls. If you do not select a phone number, the number entered under 'Telephony > Telephone Numbers > Line Settings' is used for making calls.
  5. Select the phone numbers to which the telephony device should react when you receive calls. You can select up to ten numbers (including the number for outgoing calls).
  6. Click on 'Apply' to save the settings.



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