Why is my phone displaying an accept screen during calls instead of the keypad?

[AC Question]

My dad's phone (a ZTE Z665C from TracFone) started displaying a different screen when he tried calling the lottery line for our state. The screen has a red hangup icon, a green call accept icon, and a messaging icon all around a silver ring that you pull to the icons. Choosing the items during the call does nothing but fade the screen for a moment before displaying the same screen. He wants to be able to dial numbers to navigate the automated lottery service to check his numbers, but we don't know how to get the screen back to normal. Is there any setting or option that we can use to change the screen back to a keypad?