An echo is caused when your voice is picked up by friend's microphone and transmitted back to you. Have you tried using a headset? You can use the hands-free mode without an echo. If you prefer to use speakers and microphones instead of a headset, you can use one or more of the following methods to reduce far-end echo problems (the person that needs to take these steps 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 (using the volume control on the left, below the "Talk" button). Try talking directly into the microphone to be heard clearly.
• Reduce the speaker level (using the volume control on the right).
• If the above steps do not help, turn off hands-free mode (remove the check from the Hands-free box) and take turns pressing the "Talk" button to speak. Do not leave the "Talk" button depressed when the other person is speaking.