FRITZ!Box 5490 Service - Knowledge Base

FRITZ!Box 5490 Service

Poor voice quality when conducting calls

When conducting calls, one of the following issues either occasionally occurs or always occurs:

  • When conducting calls, you experience disturbances such as echo, dropouts, delays or background noise.
  • A loud and annoying hiss is heard when conducting calls. 
  • The voice of one or both parties sounds distorted or "choppy".

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 Installing the latest FRITZ!OS for the FRITZ!Box

  1. Install the latest FRITZ!OS on the FRITZ!Box.

2 Installing the latest software for your telephone

The following steps are only necessary if you are using a FRITZ!Fon:

  1. Install the latest software on the telephone.

3 Excluding repeater(s) as a cause of error

The following steps are only necessary if you use one or more repeaters to increase the DECT range of the FRITZ!Box and you hear the background noise when making calls with cordless telephones:

  1. Unplug all of the repeaters.
  2. Check whether you still hear background noise when you use a cordless telephone to make a call near the FRITZ!Box.
  3. If you no longer hear background noise, follow the instructions in our guide Background noise when using a DECT repeater. In this case, the repeater is either not correctly connected with the FRITZ!Box or it was not positioned correctly.
    • If you can still hear background noise, plug the repeater in again and continue with the next section.

4 Restarting the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" in the "System" menu.
  3. Click on the "Restart" tab.
  4. Click the "Restart" button.

5 Reducing the call volume on the telephone

  1. Reduce the call volume on the telephone.

    Note:If you want to reduce the call volume on your FRITZ!Fon, press the "down arrow" or "telephone book" icon on the control ring while speaking on the telephone.

6 Registering cordless telephones with the FRITZ!Box

  1. Register all cordless telephones with the base station of the FRITZ!Box and switch off any other base stations.

7 Restoring FRITZ!Fon to its factory settings and re-registering it

The following steps are only necessary if the problem occurs with a particular FRITZ!Fon, but other telephones do not have problems with voice quality:

Restoring the telephone to its factory settings

  1. Press the "Menu" key on the telephone.
  2. Scroll to "Settings" and press "OK".
  3. "Reset" > "OK" > "OK"

Deleting the telephone

  1. Click "DECT" in the FRITZ!Box user interface.
  2. Click "Cordless Telephones" in the "DECT" menu.
  3. Click the (Delete) button to delete the respective telephone.

Restarting the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" in the "System" menu.
  3. Click on the "Restart" tab.
  4. Click the "Restart" button.

Re-registering the telephone

8 Configuring FRITZ!App Fon for Android

The following steps are only necessary if the problem occurs with FRITZ!App Fon on an Android device:

Enabling alternative microphone

  1. Start FRITZ!App Fon.
  2. Tap "More" and then "Settings".
  3. Tap the menu key on the telephone and then tap "Advanced".
  4. Enable the option "Alternative microphone".

Adjusting the microphone volume

  1. Start FRITZ!App Fon.
  2. Tap "More" and then "Settings".
  3. Tap the menu key on the telephone and then tap "Advanced".
  4. Adjust the microphone volume gradually.

The FRITZ!Box's echo compensation and traffic shaping functions guarantee high voice quality. However, if you still experience an echo, delays or short dropouts, they are caused by the telephone, your internet service provider or telephony provider, and cannot be influenced by the FRITZ!Box.