FRITZ!Box 6430 Cable Service - Knowledge Base

FRITZ!Box 6430 Cable Service

Setting up FRITZ!App Fon

With FRITZ!App Fon, you can make convenient calls via the FRITZ!Box using your smartphone as an IP telephone. FRITZ!App Fon can also be used with several FRITZ!Boxes; this means that you can use different FRITZ!Boxes to conduct calls, depending on your location. To do so, you have to register FRITZ!App Fon once with each FRITZ!Box as described here. Once it is registered, you can also conduct calls over a VPN connection. Besides making calls from home, you can then also make calls over the FRITZ!Box from anywhere.

Requirements / Restrictions

  • iOS 9.0 or later or Android 4.0 or later is installed on the smartphone or tablet.
  • A maximum of ten IP telephones (including FRITZ!App Fon) can be registered.
  • The FRITZ!Box (IP address in the factory settings) should use an IP address from one of the following private IP address ranges:
    • -
    • -
    • -
  • FRITZ!App Fon cannot be registered over the wireless guest access.
  • Various FRITZ!Box functions cannot be used with FRITZ!App Fon. This includes call transfer, busy on busy, call-back on busy / no response, do not disturb function for individual numbers, the ability to control certain FRITZ!Box functions such as enabling or disabling wireless LAN, loading factory settings, or setting up call diversions.

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

1 Configuring the FRITZ!Box to allow applications to access it

In the factory settings, the FRITZ!Box is configured to allow applications to access it. If you changed the FRITZ!Box's settings, configure it so that it will once again allow applications to access it:

  1. Click "Home Network" in the FRITZ!Box user interface.
  2. Click "Home Network Overview" in the "Home Network" menu.
  3. Click on the "Network Settings" tab.
  4. Enable the option "Allow access for applications" in the "Access Settings in the Home Network" section. If the section is not displayed, enable the Advanced View first.
  5. Click "Apply" to save the settings.

2 Setting up a wireless connection to the FRITZ!Box

The smartphone or tablet must be connected with the FRITZ!Box's wireless network when you set up the app:

Important:The smartphone or tablet may not be connected to the FRITZ!Box via wireless guest access.

3 Installing FRITZ!App Fon

  1. Download FRITZ!App Fon from the Google Play Store or the Apple App Store and install the app on your smartphone.
  2. Start FRITZ!App Fon.
  3. If you set a password for the FRITZ!Box user interface, enter the password.
    • If you enabled "login with FRITZ!Box user name and password", enter the user name and password. The user must be authorized to use FRITZ!App Fon. You can edit the access rights of users under "System > FRITZ!Box Users" in the user interface.
  4. Confirm that the procedure may be executed on the FRITZ!Box, if you are asked to do so.

FRITZ!App Fon is now automatically configured as an IP telephone on the "LAN/WLAN" port in the FRITZ!Box.

4 Assigning telephone numbers

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the button (Edit) for FRITZ!App Fon. When it was installed, FRITZ!App Fon was automatically configured with the telephone's device name on the "LAN/WLAN" port in the FRITZ!Box.
  4. From the drop-down list "Outgoing Calls", select the number that FRITZ!App Fon should use for making calls.
  5. Select the numbers that FRITZ!App Fon should react to when you receive calls.
  6. Click "OK" to save the settings.

5 Configuring FRITZ!App Fon for VPN

If you set up the VPN connection in Android or iOS, then you must configure the following settings in FRITZ!App Fon so that you you can conduct calls over the VPN connection:

Configuring FRITZ!App Fon for iOS

  1. Start FRITZ!App Fon.
  2. Tap "More" and then "Settings".
  3. Tap "Address".
  4. Instead of entering, enter the local IP address of the FRITZ!Box ( in the factory settings).

Configuring FRITZ!App Fon for Android

If you are using Android 5 ("Lollipop") or higher, you can use FRITZ!App Fon over a VPN connection without having to configure any settings first. The following settings are necessary in Android 4.4:

  1. Start FRITZ!App Fon.
  2. Tap "More" and then "Settings".
  3. Tap the menu key and then "Advanced".
  4. Enable the option "In all networks - Connect to FRITZ!Box even if WLAN is not connected".

6 Selecting a telephone book

FRITZ!App Fon allows you to access the contacts stored in your telephone and all of the FRITZ!Box telephone books, regardless of whether the telephone books are saved in the FRITZ!Box or you are using a telephone book of an email account:

Granting access to contacts in iOS

In order for FRITZ!App Fon to access the contacts on your iOS device under iOS, you must grant FRITZ!App Fon access to your contacts:

  1. Open the iOS settings.
  2. Tap "Privacy" and then "Contacts".
  3. Grant FRITZ!App Fon access to the contacts.

Switching telephone books

  1. Start FRITZ!App Fon.
  2. Tap "Phone book".
  3. In iOS, tap "Switch To"; in Android, tap the menu key and then "Select telephone book".
  4. Tap the telephone book you would like to use with FRITZ!App Fon. "Phone contacts" or "iPhone contacts" are the contacts stored in your telephone. The names of FRITZ!Box telephone books correspond to the names you gave them in the FRITZ!Box user interface.

When you now start FRITZ!App Fon, FRITZ!App Fon automatically connects to the FRITZ!Box and remains active in the background. This way you can then quickly and easily make calls over the FRITZ!Box. If you want, you can also completely closeFRITZ!App Fon. If you also use other telephony apps (such as Joyn) on your smartphone, then you must always start FRITZ!App Fon before you start the other telephony apps because otherwise automatic registration with the FRITZ!Box can fail.