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Knowledge document #237

FRITZ!Fon reports "Non-encrypted connection cleared"

A FRITZ!Fon cannot be used to conduct calls. Outgoing and incoming calls drop after about 10 seconds. One of the following messages is shown on the telephone display:

  • "Non-encrypted connection cleared"
  • "Connection clear-down began"
  • "Repeater connection cleared!"
  • "Reject repeater connection? Yes/No"

Cause

  • DECT encryption is not enabled in the FRITZ!Box user interface and the FRITZ!Fon is configured so that it does not allow non-encrypted DECT connections.

Whether you can enable DECT encryption in the FRITZ!Box and in FRITZ!Fon depends on whether you are using a DECT repeater from another manufacturer. DECT repeaters from other manufacturers never encrypt data they transmit, which is why you must disable encryption so you can conduct telephone calls. If you are not using a DECT repeater or are only using FRITZ!DECT Repeaters from AVM, enable encryption in the FRITZ!Box and in FRITZ!Fon. FRITZ!DECT Repeaters support encrypted connections.

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

1 Enabling encryption in FRITZ!Box and FRITZ!Fon

If you did not register any DECT repeaters or only registered FRITZ!DECT Repeaters with the FRITZ!Box, enable encryption in the FRITZ!Box and in FRITZ!Fon:

Enabling encryption in the FRITZ!Box

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "DECT" in the "Telephony" menu.
  3. Enable the option "Permit only secure DECT connections (recommended)" in the section "Security".
  4. Click "Apply" to save the settings.
  5. If the option was disabled, you must then restart the FRITZ!Box once using the user interface ("System > Backup > Restart").

Enabling encryption in FRITZ!Fon

  1. Press the "Menu" key on the telephone.
  2. Scroll to "Settings" and press "OK".
  3. "Telephony" > "OK"
  4. Enable the "Secure" setting.

2 Only with DECT repeaters from another manufacturer: Deactivating encryption

If you registered a DECT repeater from another manufacturer with the FRITZ!Box, you must disable encryption in FRITZ!Fon:

Deleting telephones

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the (Delete) button to delete all of the registered telephones that are connected via "DECT".

Disabling encryption in FRITZ!Fon

  1. Press the "Menu" key on the telephone.
  2. Scroll to "Settings" and press "OK".
  3. "Telephony" > "OK"
  4. Deactivate the "Secure" setting.

Re-registering all telephones

  1. Use the wizard to register all of the cordless telephones with the FRITZ!Box.
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