Nokia E52 :: Sound Trouble During My Calls?

I asked for an answer in one of the older threads a pretty long time, but didn't get a reply. I also searched through some other discussions, but couldn't find a definite solution.My problem is the infamous "echoing" during calls. Specifically, people who call me hear an echo during phone calls. Somebody told me that it almost sounds like they're on speaker phone. It's a real pain in the **bleep**, because things often have to be repeated a number of times in order for it to be understood. So have can I fix this? I'm using the 034.001 software version.