FRITZ!Box 5490 Service - Knowledge Base

FRITZ!Box 5490 Service

Callers do not hear busy signal when 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 then assumes that the line is available.

Important:Some of the settings described here are only displayed if the advanced view is enabled in the user interface. The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS

Simply proceed as described below. After each measure, check whether the issue persists.

1 IP telephones do not support the function

The function "call rejection on busy (busy on busy)" 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

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the button (Edit) 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". If you are using ISDN telephones, you must disable the option directly in the telephone. Refer to the device's manufacturer for information on how to set it up, for example consult the manual.
  7. Click "OK" to save the settings.