FRITZ!Fon C5 Service - Knowledge Base

FRITZ!Fon C5 Service

FRITZ!Fon does not ring when you receive a call

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

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

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, no more than 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:

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

3 Turning the telephone off and then on again

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

4 Disabling the do not disturb function, call blocking and call through

The do not disturb function, call blocking, call diversion or call through may be preventing the telephone from ringing. 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"; 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 now rings, then the DECT connection to the telephone was interrupted. All devices that emit radio waves are possible sources of interference. Examples of these are other DECT base stations, baby monitors, mobile telephones and television antennas. If the telephone does not receive the "wake up" signal from the FRITZ!Box in time and as a result does not wake up from standby mode, moving the telephone to a different location may help.

6 Assigning telephone numbers to a telephone

  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 number: Enter the number under "Outgoing calls" or under "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 so that they 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 incoming calls to an internet telephone number although the internet connection and internet telephone number are correctly configured, your internet telephony provider is experiencing technical difficulties:

Important:After porting your telephone number (for example after switching to an IP-based line), you can often make calls with the number immediately. However, you cannot receive calls to this number for one or two more days because the telephone number is not completely ported until then.

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