Re: No
"And if the caller is I'D as international and vanishes the next day?"
Then they succeed in annoying you. That said, you know they're a scam because they aren't obeying the DNC.
Just because a given law isn't perfect and doesn't solve every possible use case doesn't mean it isn't a step in the right direction. What would you prefer, a DNC law that is imperfect and in which some scammers make it through or no DNC law at all in which you are irritated dozens of times a night by telemarketers?
People who let perfect be the enemy of good are, to my thinking, batshit crazy.