This guide is suitable for FRITZ!Fon MT-F DECT handsets.
What we'll cover:
- registering a FRITZ!Fon handset with a FRITZ!Box router
- Managing a registered FRITZ!Fon handset
Not what you're looking for? Try the NodePhone guide for FRITZ!Box routers.
Registering a FRITZ!Fon handset with a FRITZ!Box router
When the FRITZ!Fon is turned on for the first time it will begin the registration process. You will be prompted on the screen of the phone to 'Hold the DECT button on the FRITZ!Box down'. This is a convenient way of quickly associating the FRITZ!Fon with the FRITZ!Box.
- When the FRITZ!Fon has been fully charged, turn the device on by pressing and holding down the end call button.
- You will be prompted to hold the DECT button on the FRITZ!Box.
- Continue holding the DECT button on the FRITZ!Box until the device is registered.
Your FRITZ!Fon will now be registered to the FRITZ!Box. If a NodePhone account has been previously set up, you will be able to make calls through the now-registered phone. If a NodePhone account has not been configured, see our NodePhone guide for FRITZ!Box routers to set one up.
Managing a Registered FRITZ!Fon
Step 1
- Ensure that your computer is connected to your FRITZ!Box and you have access to the internet.
- Open your preferred web browser, e.g., Internet Explorer, Mozilla Firefox, etc.
- Enter the following address into the address bar and then hit Enteron your keyboard:
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Figure 1: Entering the address to access the router
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Step 2
- The FRITZ!Box Log In page will open. You will be prompted for a password.
- The default password is admin (you may have changed this password when you initially configured the device).
- Click Login.
- If the interface prompts you to select your language please follow the initial setup guide instead.
Step 2
- Once you are logged into the FRITZ!Box, select Wizards from the menu to the left of the screen.
- Click Manage Telephony Devices. The registered FRITZ!Fon will appear in the Manage Telephony Devices table. You can ensure you are configuring the correct device by checking the name in the main screen of the FRITZ!Fon to the name in the device table.
- Click Edit next to the device you would like to configure.

Step 3
- Select your NodePhone account from the drop-down list next to Outgoing Calls.
- Choose React to all Numbers.
- Click Next and then OK to complete the wizard.
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Figure 2: Changing the NodePhone account your handset will use
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If you have multiple NodePhone accounts, it's possible to choose React only to the following numbers. This will allow you to specify which number, when dialled, will cause this phone to ring.
You should now be able to make VoIP calls from the specified NodePhone account using the registered FRITZ!Fon. If you ever need to change which account this phone uses or any other features of the phone, you can come back into 'Manage Telephony Devices' at any time.
Further Assistance
If you're looking to also set up your NodePhone service for your FRITZ!Box router, please refer to our other guide:
If you are having trouble setting up your router or would like to clarify some of the steps, please contact our Support Team.