FRITZ!Fon MT-F Service - Knowledge Base

FRITZ!Fon MT-F Service

FRITZ!Fon does not ring when you receive a call

The FRITZ!Fon sometimes does not ring or never rings when you receive calls, although the telephone 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 persists.

1 Number of calls via a DECT repeater is limited

When you receive a call, a maximum of two of the telephones located in the coverage area of a DECT repeater from a different manufacturer ring. If you are using a FRITZ!DECT Repeater or a FRITZ!Box in DECT repeater mode, up to five telephones ring at the same time.

2 Disabling Do Not Disturb on the telephone

The following steps are only necessary if there is a bell with a line through it at the top of the telephone's display:

  1. Press the * button on the telephone for 3 seconds to disable the Do Not Disturb function.

3 Turning the telephone off and on again

  1. Hold down the end call key (red handset) to turn the telephone off, and then turn the telephone on again.

4 Disabling the Do Not Disturb function, call blocks, and call through

The telephone may not ring because the Do Not Disturb function, call blocks, call diversion, or call through is enabled in the FRITZ!Box. Disable these functions in the FRITZ!Box:

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the (Edit) button for the respective telephone.
  4. Click on the "Do Not Disturb" tab, disable any "Do Not Disturb" settings, and click "OK".
  5. Click "Telephony" and then "Call Handling", and delete any call blocks that may be present.
  6. Click on the "Call Through" tab. If the tab is not displayed, enable the Advanced View first.
  7. Disable call through and click "Apply".

5 Disabling "DECT Eco"

  1. Click "DECT" in the FRITZ!Box user interface.
  2. Click "Base Station" in the "DECT" menu.
  3. Disable the option "DECT Eco" in the "Radio Field Strength" section.
  4. Click "Apply" to save the settings.

If the telephone rings now, then the DECT connection to the telephone was disturbed. All devices that emit radio waves are possible sources of interference. These include DECT base stations, baby monitors, mobile telephones, and television antennas, for example. If the telephone does not receive the "wake up" signal from the FRITZ!Box in time and does not wake up from standby mode, repositioning the telephone may help.

6 Defining telephone numbers for telephones

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the (Edit) button for the respective telephone.
  4. Configure the telephone so that it reacts to incoming calls to the desired telephone number: Enter the number under "Outgoing calls" or "Incoming calls", or enable the option "React to all numbers".
  5. Click "OK" to save the settings.

7 Maintaining a permanent internet connection

Calls to your internet telephone number can only reach your 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, then the FRITZ!Box is already permanently connected to the internet.
  5. Click "Apply" to save the settings.

8 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, then your internet telephony provider is experiencing a problem:

Important:After porting telephone numbers (for example after switching to an IP-based line), 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.