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FRITZ!App Fon does not ring when you receive a call

FRITZ!App Fon sometimes does not ring or never rings when you receive calls, although FRITZ!App Fon is correctly registered with the FRITZ!Box and you can make telephone calls with this number.

Simply proceed as described below. After each measure, check whether the problem is solved.

1 Disabling "Do Not Disturb" mode for FRITZ!App Fon

The following steps are only necessary if the problem occurs with FRITZ!App Fon on an Android device:

  1. Tap the "Settings" icon on the home screen of the Android device.
  2. Tap "Apps & notifications" in the "Settings" menu.
  3. Tap "Notifications" and then "Advanced".
  4. Tap "Do Not Disturb" and disable the "Do Not Disturb" mode for FRITZ!App Fon.

2 Enabling the option "React to calls" in FRITZ!App Fon

  1. Start FRITZ!App Fon.
  2. Tap the the three-dot menu on the top right (Android) or "More" (iOS) and then tap "Settings".
  3. Enable the option "React to calls".

3 Disabling call blocks and call through in the FRITZ!Box

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Call Handling" in the "Telephony" menu.
  3. Click on the "Call Blocks" tab and delete all call blocks.
  4. Click on the "Call Through" tab. If the tab is not displayed, enable the Advanced View first.
  5. Disable call through and click "Apply".

4 Defining telephone numbers for FRITZ!App Fon

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the (Edit) button for FRITZ!App Fon. When it was installed, FRITZ!App Fon was automatically set up with the device name of the telephone on the "LAN/Wi-Fi" port.
  4. From the drop-down list "Outgoing Calls", select the number to be used by FRITZ!App Fon for making calls.
  5. Specify which telephone numbers FRITZ!App Fon should react to when you receive calls.
  6. Click "OK" to save the settings.

5 Maintaining a permanent internet connection

Calls to your internet telephone number can only reach the FRITZ!Box if an internet connection is active. Some FRITZ!Box models must be configured to permanently maintain the internet connection:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. Click "Change Connection Settings".
  4. Enable the option "Maintain permanently (recommended for flat rates)". If the option is not shown, the FRITZ!Box is already permanently connected to the internet.
  5. Click "Apply" to save the settings.

6 Having your numbers checked

If the telephone still does not ring when you receive calls to an internet telephone number although the internet connection and internet telephone number were configured correctly, your internet telephony provider is experiencing a problem:

Important:After porting telephone numbers (for example after switching to an IP-based connection), telephone numbers can often be used immediately for outgoing calls. However, you cannot receive calls to these numbers for one or two days because the telephone numbers are not completely ported until then.

  1. Contact your internet telephony provider and have your number checked.