They did not leave message.
I am registered on the DNC List.
 Jun 10th, 2013
Caller ID says UNKNOWN NAME, left no message. Get a real job. My call was at2:57pm on June 6th. Also on the useless DNC list.
Annoyed in MA
 Jun 06th, 2013
Read the "Annoyed in NYC" comment. Identical situation here. My call came in 06/06/13 @ 2:24pm
Annoyed too
 Jun 06th, 2013
I got a call from this number 650-644-4123 on 6/1/13 at 5:17pm at my home in NYC.
My caller ID said UNKNOWN NAME.
I called back the number and heard a strange "ding" and then got a very odd, automated recording of a person which tried to act as if it was not an automated recording. I know that sounds weird but it is the truth. The system was listening to questions I would ask, for key words and then respond as if it was a real person.
The "caller" identified themselves as Jeff Stewart of the American Veterans Support Foundation. When I asked what that was the automated response said it was a "very special project" of the National Vietnam Veterans Foundation. When I asked where they were located they said Eden, NJ (which is odd since the area code is in Palo Alto, CA). When I asked how can I get back in touch with them, they gave me an 800# (1-800-270-0018) which led back to a "Fundraising Company", the woman would not give me her name or the name of the company and she said they were a company which does fundraising for many different groups. I then researched the "American Veterans Support Foundation" and found this posting about them:

"It turns out that they are a legal organization, but although they comply with the law by reporting to the state, in fact they are in business for themselves. According to the attorney general's office, they collected $4.3 million dollars last year. They claim 86 percent for expenses and only 14 percent goes toward helping veterans."
Annoyed in NYC
 Jun 01st, 2013
Called 2.23pm Jun 1st 2013. No answer. I am on the do not call list for what it's worth
 Jun 01st, 2013
Unidentified caller who left no message at 8:28 PM. We are on "Do not call list".
 May 29th, 2013