How do I prevent "No Internet calling account" error?

I'm running 2.3-Gingerbread. Calling was working fine over the telephone network. I set up the internet calling feature by adding an account to test the featuire out. Then I removed the account. Every time I dial a number I get this error: No Internet calling account There are no Internet calling accounts on this phone. Add one now? If I click cancel, it doesn't dial using the telephone network it just returns to the home screen. I've cleared the defaults for the Dialer application but still the problem persists. Does anyone know how I can prevent this error?