We upgraded from Succession 3.0 to 4.5 last week. Since the upgrade, the headset button on i2002's and i2004's will no longer work as a speaker button. A lot of our employees are used to using the headset button instead of speaker button because it is closer to the dial pad. Is there a way to make this work again? It works fine when there is a headset attached. I am getting a lot of complaints..