Not as far as I'm aware. You might want to consider a BT earpiece. They work a treat, and leave your phone free to surf the web when you are dealing with a tedious person on the other end.
Even a wired set of earbuds would help. Or train yourself to hold the phone different as to not hit the mute button. My wife has a habit of holding her 5c too far up on her ear, and it causes me to hear myself like an echo. I have to tell her to lower the phone.