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Knowledge document #108
FRITZ!Box 6850 LTE
This support document is available for the following products:
- FRITZ!Box 7690
- FRITZ!Box 7590 AX
- FRITZ!Box 7590
- FRITZ!Box 7583 VDSL
- FRITZ!Box 7583
- FRITZ!Box 7582
- FRITZ!Box 7581
- FRITZ!Box 7560
- FRITZ!Box 7530 AX
- FRITZ!Box 7530
- FRITZ!Box 7520
- FRITZ!Box 7510
- FRITZ!Box 7490
- FRITZ!Box 7430
- FRITZ!Box 7390
- FRITZ!Box 7360
Setting up an external fax in the FRITZ!Box
You can use a fax machine connected to an analog extension (for example FON 1) 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:
- Click "Telephony" in the FRITZ!Box user interface.
- Click "Telephone Numbers" in the "Telephony" menu.
- Click on the "Line Settings" tab.
- Click "Changing the Settings" in the "Telephony connection" section.
- Enable the option "Fax transmission using T.38".
- Click "Apply" to save the settings.
2 Reconfiguring the fax machine
- Click "Telephony" in the FRITZ!Box user interface.
- Click "Telephony Devices" in the "Telephony" menu.
- If the fax machine is already displayed in the list of telephony devices, click the (Delete) button for the fax machine.
- Reconfigure the fax machine: Click the "Configure New Device" button and follow the instructions.
- 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.