Nokia 6080
Keypad tones heard even when not pressed during call, yet display of numbers is also seen

I Have got nokia 6080 . when i make a call i n also the other end get to hear the keypad tones even when i done press the key pad . its really disturbing to hear the tone. I have done the restore factory setting . n keypad off . but still the problem persist do give me a solution for this as soon as possible.