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I think it is UAB  Medicine

I got a call but they did not leave a message. Another site says its a high degree of spam with 390 spam calls. (whitepages)
Another site says its a UAB appointment reminder. I have an upcoming appointment but not with UAB.
If it was an appointment reminder you would think they would leave a message.

I called it back- message said a representative would be right with you. Then it hung up.
If it was a spam call, me calling back will probably mean more spam calls.
But unlike most, my VOIP phone does not ring. I keep it off only plugging it in if I need to make a call. (Flip phone stays in the car)
This is because I got woke up by too many spam calls in the past. But, there has not been many in recent months.

390 people who never answered the call and simply assumed that it was spam just like you.