Do not disturb issue

Is DnD different on iOS 8 than iOS 7?

On iOS 7 when I received a call, it didn't ring and the screen didn't light up, but it told me I had a missed call when I turned the screen back on.

On iOS 8, it doesn't even tell me that someone called. I always have people texting me saying why aren't you answering my calls, and I have no missed calls.

Is this normal?