FRITZ!Box 7530 Service - Knowledge Base

FRITZ!Box 7530 Service

Setting up an external fax in the FRITZ!Box

You can use a fax machine connected to an analog port 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 telephone 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 "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone 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.
  5. Enable the option "Fax transmission using T.38".
  6. Click "Apply" to save the settings.

2 Reconfiguring the fax machine

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