Sidetone too loud sometimes and causing echo

[John62]

On some calls we get a loud sidetone, which I understand to be hearing your own voice in the receiver, and an echo. My guess is that the sidetone is the cause of the echo. Most times when this happens the other party cannot hear the echo. The echo is of our own voice and not the other party's voice.

Is there any way to solve this? I searched here but didn't see an answer. Do I just need to make a ticket? Using T215 E2 phones. Thanks!

After posting this I did see this link. http://forum.yealink.com/forum/showthread.php?tid=2742

[Johnson_Yealink]

Dear Customer,

This is Johnson from Yealink technical support team, nice to work with you.
Would you please setting "Echo Cancellation" via web interface.
ECHO enable
VAD enable
CNG enable

Please refer to below attachments file.

Any question, please feel free to let me know.

BR
Johnson