Actually, my iPad is with me downstairs in my living room, but my iPhone is upstairs in my bedroom.
When a call comes in and my cover is closed/pad sleeping, the pad will ring once in a while, but not often. The screen will light up with the caller though after I open the case to reveal the screen.
Now, if I am on the pad looking at whatever site like ESPN and a call comes in, the pad will always ring with the banner showing me who is calling.
Dont really need the pad to ring while I see the call actually coming in, but rather I need to know when that occurs with the case closed.
I had this issue on the base iPad, IPad Air 5 and most recently with my IPad Pro/M2.
Luckily I have a Series 8 Watch, so I always know when I am receiving a call.