Called back and it says something about "Fund Raising Drive." then there's silence for a few seconds. If you wait though it says hit 9 for more options. Did that, then you can hit to add to do-not-call list.
This number calls several times a week, never leaves a message (I won't pick up if I don't know who it is). They call various times per day from early morning to late evening.
This number calls frequently leaving no messages. Usually don't answer number I don't recognize but did today and the line was silent. Don't understand what they are getting from this.