I can silence the dial pad using the settings (settings -> Sound & display), but the dial pad can still be heard while making a call.
Here's an illustration: When I dial a number there is no sound when pressing the dial pad to make the initial call, but during the call if I need to dial numbers (for example when in a phone menu) then I can hear the dial pad.
I have not been able to figure out how to silence the dial pad completely.
Has anyone had this problem? Are there any suggestions to follow?