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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.

1 Connecting fax machine to the FRITZ!Box

  1. Connect the fax machine to an analogue extension on the FRITZ!Box (for example 'FON 1').

    Important:The FRITZ!Box has two 'FON 1' sockets. One socket is for phones with a TAE plug and one socket is for phones with an RJ11 plug. Only one of the two 'FON' sockets may be used at a time. The other 'FON 1' socket must remain free (unused).

  2. If the fax machine is an all-in-one printer with an integrated fax machine, also use a network cable or Wi-Fi to connect the printer to the home network of the FRITZ!Box and configure the printer as a network printer.

2 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. If the tab is not displayed, your cable provider automatically configures the line settings during configuration. You cannot change these settings later. Your cable provider can provide you with information on the settings.
  4. Click on 'Changing the Settings' in the 'Telephony connection' section.
  5. Enable the option 'Fax transmission using T.38'.
  6. Click on 'Apply' to save the settings.

3 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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