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Knowledge Base document #108

Setting up an external fax in the FRITZ!Box

You can use a fax machine connected to an analogue extension of your FRITZ!Box to send and receive faxes over the internet.

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

1 Enabling fax transmission with T.38

If you use an internet phone number for faxing, you must enable T.38 (fax over IP) in the FRITZ!Box for fax transmission. With T.38, a special network protocol is used for fax transmission instead of signal tones. This makes transmission significantly less susceptible to interference:

  1. Click on 'Telephony' in the FRITZ!Box user interface.
  2. Click on 'Phone Numbers' in the 'Telephony' menu.
  3. Click on the 'Line Settings' tab.
  4. Click on 'Changing the Settings' in the 'Telephony connection' section. If the section is not displayed, enable the Advanced View first.
  5. Enable the option 'Fax transmission using T.38'.
  6. Click on 'Apply' to save the settings.

2 Reconfiguring the fax machine

  1. Click on 'Telephony' in the FRITZ!Box user interface.
  2. Click on 'Telephony Devices' in the 'Telephony' menu.
  3. If the fax machine is already displayed in the list of telephony devices, click on the (Delete) button for the fax machine.
  4. Reconfigure the fax machine: Click on the 'Configure New Device' button and follow the instructions.
  5. If you cannot select the socket the fax machine is connected to when configuring it, another telephony device was already configured for that socket. Delete that device first.



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