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Knowledge document #3617

Calls with a cordless telephone drop frequently

When conducting calls with a cordless telephone registered with the FRITZ!Box, some or all calls drop suddenly during calls. The problem either occurs sporadically or all the time.

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 Correcting the settings for the internet telephone number

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the (Edit) button for the respective internet telephone number.
  4. Select "Other provider" from the "Telephony provider" drop-down list.
  5. Click "Additional Settings" to display all of the settings.
  6. Select the option "20" in the field "Packet size in milliseconds in send direction" in the "Additional Settings for the Telephone Number" section.
  7. Click "Apply" to save the settings.

2 Correcting the DECT encryption

The following step is only necessary if all calls conducted with a FRITZ!Fon drop after a few seconds:

  1. Follow the steps in our guide FRITZ!Fon reports "Non-encrypted connection cleared". DECT encryption is incorrectly configured.

3 Optimizing the DECT range

The following step is only necessary if calls only drop when you are at a greater distance from the FRITZ!Box:

  1. Follow the steps in our guide DECT range is too low. The DECT connection is interrupted or the telephone is not within the DECT range when the call drops.

4 Checking the display for error messages

  1. Check whether a message is shown on the telephone's display right after the call drops.
  2. If the message "Non-encrypted connection cleared" is displayed, follow the steps in our guide FRITZ!Fon reports "Non-encrypted connection cleared".
  3. If the message "Search for base" is shown, follow the steps in our guide DECT connection drops frequently.
  4. If no message is shown and the connection is not interrupted, follow the steps in the guide Parties cannot hear each other.
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