* The audio device being used by the person you are calling creates an echo. To improve the call quality at least one person should use a headset instead of loudspeakers.

* If a headset cannot be used, adjust your speaker and microphone volume to a lower level in your system audio settings.
Note: The echo suppression works better in environments with few background noises.

- Incorrect audio device settings

* Check whether your microphone is switched dumbly. Some microphones have control keys to dumb them.

* The microphone can be connected through the 'line-in' port or the 'microphone' port of your audio device. Make sure, that you are using the microphone port. Please also check in your audio settings, that the microphone line is selected and the volume level is up.



* Make sure that the volume level of your speaker is up and the speakers are not muted.


- Personal firewall software:

* Normally you don't need to change the firewall settings. However, some windows personal firewall systems are blocking UDP data by default. You can temporary switch off your personal firewall to check that.