I'm not sure that much can be done on the government level. I would say that the majority of these telemarketer outfits are located overseas and are utilizing VoIP services to make their calls.
I read somewhere that US companies that contract call center operations to overseas firms are supposed to ensure that they comply with the law.
Outfits attempt to skirt the rules. Someone pitching solar power might conduct a survey before entering into the marketing portion of their presentation in an attempt to exploit the survey loophole in DNC rules.
If I don't recognize a telephone number, or, Caller ID shows what Hal mentioned earlier, I simply let the auto attendant or voice mail (calls to my cell phone) handle it. Annoying for sure, but, they won't be able to get any money out of me.
