FRITZ!Box 6490 Service - Knowledge Base

FRITZ!Box 6490 Service
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Cordless telephone is deregistered after a FRITZ!Box restart

After the FRITZ!Box is restarted, for example after a FRITZ!OS update, a cordless telephone from another manufacturer no longer connects to the FRITZ!Box automatically and must be registered again.

Cause

  • The cordless telephone does not support the expanded security functions for the DECT connection.

Disabling expanded security functions

  1. Click "DECT" in the FRITZ!Box user interface.
  2. Click "Base Station" in the "DECT" menu.
  3. Disable the expanded security functions in the "Security" section.
  4. Click "Apply" to save the settings.

After disabling the expanded security functions, you must register your cordless telephone with the FRITZ!Box once.