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Knowledge document #124

FRITZ!Box 6840 LTE

This support document is available for the following products:

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.

Note:All instructions on configuration and settings 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 is solved.

1 IP telephones do not support the function

The "Busy on busy" function is not supported when making calls with IP telephones (for example FRITZ!App Fon). If you are using an IP telephone to conduct a call, it is therefore not possible to give the caller a busy signal.

2 Configuring the FRITZ!Box

Click "Telephony" in the FRITZ!Box user interface.
Click "Telephony Devices" in the "Telephony" menu.
Click the (Edit) button for the respective telephone.
Click on the "Telephony Device Features" tab.
Enable the option "Call rejection on busy (busy on busy)".
Disable the option "Call waiting".
Click "OK" to save the settings.