This is interesting. I got an email from verizon probably a couple of months ago, indicating that they had rolled out their own spam filters, and Idefinitely saw a decrease in spam calls, and when one came through, the caller ID was "potential spam".
If I read the OP right, this gov program just now started. Coincidentally, I have gotten a half dozen un-ID'd spam calls* yesterday and the same today, all with the area code from where I used to live.
* I'm assuming spam. I don't answer unknown numbers. Several of the calls were from the same number, and none left a VM.