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Knowledge document #122

Telephone connected to FRITZ!Box rings, but there is no incoming call

Occasionally a telephone connected to the FRITZ!Box rings although no one called you, or it rings right after you have ended a call and hung up. Sometimes the telephone may continue to ring although the caller already hung up before you could answer the telephone. When you pick up the handset, you hear a dial tone.

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

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Disabling the option "Message waiting indication on the telephone (MWI)"

The following steps are only necessary if the telephone is connected to an analog extension (for example "FON 1"):

  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 "Telephony Device Features" tab.
  5. Disable the option "Message waiting indication on the telephone (MWI)".
  6. Click "Apply" to save the settings.

If the telephone now no longer rings, you have new messages in the mailbox of your internet telephony provider. The FRITZ!Box calls you to indicate that you have new messages because your telephony provider supports MWI (Message Waiting Indication).

2 Disabling the alarm

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Alarm" in the "Telephony" menu.
  3. Disable the alarm.
  4. Click "Apply" to save the settings.
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