I answered, said Hello. No one said anything. As I was getting ready to hang up I heard a young girl say, Hello, Hello. So, I just hung up. Wasn't a # I knew, and wasn't some one that sounded familiar. I added them to my phones "Auto Reject" list.
Some sort of charity. Called back using a different number and it went to a recording. It mentioned something about how charities are exempt from the national do not call list.