They called again yesterday, Sept. 24th. This time caller id showed "savings". I see I posted here on Sept. 19. Vonage doesn't block calls, so guess now I have to buy a Panasonic phone with call block, as the DNC doesn't do anything.
They call and claim you're a customer of Con Edison, and that they can offer you a lower utility bill. I pressed the prompt to talk to someone and said that I was on the no call list, and they hung up on me.