Echo problem with Plantronic headset and Polycom phone

I have a Polycom VVX311 phone and a Plantronics WO2 headset. The headset cord is plugged into the headset jack on the phone base. I can make/answer calls; however, the person on the other end of the call says that there’s a terrible echo on their end. One person said he could hear himself echo more clearly than they can hear me. I don’t hear an echo at all.

Disconnecting the phone curly cord makes the echo even louder. Can you think of anything I can do to fix this?

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