I think this is the second call I received from this number recently.
The guy actually had the name of a person but he had the wrong area code (He apparently dialed 630 instead of 847.)
When I told him he had dialed the wrong area code, he asked who I was (didn't answer quick enough for him I guess) then he asked if it was for a business (I said, "No.") then he asked if it was a residence he had called (I said, "Yes.") Then he asked, "Since I have you, do you want to donate to Special Olympics?"
"No thanks, I do that locally." Well, OK, so they are local... ;-)
The area code 224 is an overlay for the 847 area code.
Some interesting reports here:
Special Olympics Illinois would be my guess based on the Caller-ID others reported as "SOIL" and as reported by "hr" earlier.
It's strange that they would hang up when someone answers though - why would they turn down a chance to ask for money? The guy that called me didn't pass up that chance.