Echoes happen when your voice is picked up by friend's microphone and transmitted back to you. Have you tried using a headset? That often takes care of the echo. But if you prefer to use speakers and a microphone instead, you can try one or more of the following methods to reduce "far-end" echo problems (the person who needs to do this is not the person hearing the echo, but the person at the far end of the conversation):

• Move the microphone as far away from the speakers as is practical.
• Reduce the microphone level (use the volume control on the left, below the "Talk" button). Try talking directly into the microphone to be heard clearly.
• Reduce the speaker level (use the volume control on the right).