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Knowledge Base document #124

Callers do not hear busy signal when a call is already being conducted via FRITZ!Box

Callers hear a ringing tone instead of a busy signal if a telephone call is already being conducted over the FRITZ!Box. The caller therefore assumes that the line is free.

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 Configuring 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 "Telephony Device Features" or "Properties" tab.
  5. Enable the option "Call rejection on busy (busy on busy)".
  6. Disable the option "Call waiting". With ISDN telephones, you must disable the option directly in the ISDN telephone. Refer to the manufacturer of the device for information on how to set it up, for example consult the manual.
  7. Click "OK" to save the settings.

2 Function not supported by IP telephones and telephones connected to the Mesh Repeater

The 'Call waiting' and 'Busy on busy' functions are not supported for the following phones:

  • IP phones (e.g. FRITZ!App Fon)
  • Phones on a FRITZ!Box that is configured as a Mesh Repeater

If you are making a call with an IP phone or with a phone on a Mesh Repeater, a busy signal cannot be heard by other callers.

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