FRITZ!Box 7340 Service - Knowledge Base

FRITZ!Box 7340 Service

Poor speech quality when making and/or receiving telephone calls

One of the following issues sometimes or always occurs when you conduct calls:

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

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 Installing the latest FRITZ!OS for the FRITZ!Box

2 Installing the latest software for your telephone

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

3 Excluding repeater(s) as a source of interference

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

  1. Unplug all of the repeaters.
  2. Check whether you hear background noise when you make a call with a cordless telephone while you are close to the FRITZ!Box.
    • If you no longer hear background noise, the repeater is either not properly connected with the FRITZ!Box or it is not positioned correctly:
    • If you can still hear background noise:
      1. Plug the repeater in again.
      2. Proceed with the following 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 Checking the DSL connection for errors

A poor DSL connection has the greatest impact on applications that require real-time transmission, such as Internet telephony. It especially affects the upload direction, thus affecting the quality of voice data being transmitted to the party being called. Therefore, check whether the quality of the DSL connection is sufficient for conducting Internet calls:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "DSL Information" in the "Internet" menu.
  3. Click on the "DSL" tab.
  4. Check in the "Error Counter" section whether "Not Remediable Errors" (CRC) occur in the FRITZ!Box or the DSL exchange while you conduct a call over the Internet:
    • If no errors occur, then the signal quality is sufficient for conducting Internet calls:
      • Proceed with the following section.
    • If many errors occur, then the disturbances you experience when conducting calls over the Internet are due to the poor signal quality of the DSL connection:

6 Reducing the in-call volume on the telephone

  • Reduce the in-call volume on the telephone.

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

7 Registering cordless telephones with the FRITZ!Box

  • Register all cordless telephones with the FRITZ!Box's base station and switch off all other base stations.

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

The following steps are only necessary if the issue only occurs with a particular FRITZ!Fon, and you do not experience problems with speech quality when using other telephones:

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 button (Delete) to delete the relevant 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

9 Configuring FRITZ!App Fon for Android

The following steps are only necessary if the issue occurs when using FRITZ!App Fon with 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 step by step.

10 Configuring the FRITZ!Box for Internet telephony

The following steps are only necessary if you are using the FRITZ!Box to conduct calls over the Internet (VoIP):

Setting the speed of the line

The following step is only necessary if the FRITZ!Box is not connected directly to a DSL line:

Note:If you are using your FRITZ!Box as a DSL router (standard), it automatically determines these values.

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. Click on "Change connection settings".
  4. Enter the relevant speeds of your Internet connection in the "Upstream" and "Downstream" fields in the "Connection Settings" section.

    Example:
    Enter 2000 for an upstream of 2 Mbit/s; enter 32000 for a downstream of 32 Mbit/s.

  5. Click "Apply" to save your settings.

Setting up a prioritization rule for Internet telephony

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Filters" in the "Internet" menu.
  3. Click on the "Prioritization" tab.
  4. Check under "Real-time Applications" whether a rule for "Internet telephony" is present.
  5. If there is no rule for Internet telephony, click "New Rule".
  6. Select "All devices" (default) as the network device from the corresponding drop-down list.
  7. Select the entry "Internet telephony" from the drop-down list "Enter the network application:".
  8. Click "OK" to save the settings.

Configuring other applications

Applications such as file sharing software and online games establish many simultaneous Internet connections. Although the "Traffic Shaping" function of the FRITZ!Box ensures that voice data is prioritized and evenly transmitted, for technical reasons it can only compensate for disturbances caused by these applications to a certain extent:

  1. Decrease the number of simultaneous connections that are allowed.
  2. Reduce the maximum throughput available to the application.
    • If you still experience disturbances when conducting calls over the Internet:

The FRITZ!Box's echo compensation and traffic shaping functions guarantee high speech quality when using Internet and landline telephony. However, if you still experience an echo, delays or short dropouts, these are caused by the telephone being used, your Internet service provider or telephony provider, and cannot be influenced by the FRITZ!Box.

If you hear the echo when using your analog landline to make telephone calls, then the signal delay on this telephone line is unusually high. This delay causes such a strong echo that the echo compensation integrated in the FRITZ!Box is unable to suppress it.

The signal delays increase if the telephone is connected to a PBX (such as the FRITZ!Box). In some cases the echo is so strong that neither the FRITZ!Box nor the telephone is capable of entirely eliminating the echo.

Therefore, you may only be able to hear the echo when the telephone is connected to the FRITZ!Box and not when it is connected directly to your landline.