Leaves no message on voicemail. Obviously - the 'Do Not Call List' is completely useless. It's clearly not enforced, and these idiots manage to find ways around it.
Be cautious when you receive call that seems even slightly suspicious. I got a 'spoof' call the other day where caller ID showed the correct name and phone number for one of my credit cards. Since my credit card companies never call, I assumed it was a scam and let it go to voicemail - but just to verify, I checked with the card issuing bank, and they confirmed that they did not call me. In fact, I was advised that they knew this was happening to other card holders. Most banks that issue credit cards are on the hook for fraudulent activity up to a fairly large amount, so it's surprising they make no effort to warn card holder of these scams, When I received a second call from this number, I answered. The woman (sounded unprofessional) insisted she was with the Bank. I advised her that I knew it was scam, and that I had reported them to the credit card company and the State Attorney's office. She hung up.