Received a call from 937-412-1189 at 9:35a today (Sunday). Individual stated that he was from 'Global ...' ... something about travel ... difficult to understand due to fairly heavy accent. I cut him off by asking him where he was calling from. He stated Independence, Ohio (I believe). I said that we were in the same time zone (EST) and, in light of the fact that he was calling me on a Sunday morning, asked him if I could call him back next Sunday morning at his home residence. He laughed and hung up. My best guess: a total scam. If you have the ability to block numbers through your provider (as I do), I suggest doing it since this is not a legitimate business where, after notifying them to take you off of their call list, they have 48 hours to comply by federal law.
Hopefully, you didn't answer this robo-call--which is exactly what you received.
Tele-scammers use simple robo-call machines, some exist as software on desktop PCs and even laptops, that 24 / 7, systematically call numbers--only recording the ones where people answer up; those calls get "marked".
Then the machine lists only the "marked" calls, which then get listed into a "hot sheet" for either use by the scammer, or sold to other tele-scammer groups for big dollars---sometimes, going as high as paying $170,000 for such a list. Tele-scamming has indeed become big business.
The Do Not Call Registry only affects US generated calls; most all tele-scammers operate OUTSIDE the US.
Your simplest defense: Simply REFUSE to answer any caller ID number you don't recognize; if they're legit, they will leave voicemail. If the number calling you does NOT leave voicemail--it's safe to assume they're frauds out to try and scam you.
Tele-scammers don't make money off unanswered calls.