Some 888 number. I always run a check on unknown phone numbers at places like "who called me" etc.
1-888-802-5343 is the number reported on my phone at the time.
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It's usually a robotic voice in a monotone that begins with something like "We have been trying to reach you. This is IRS". (not the IRS) I don't pay for caller ID or any blocking services and, lately, we've been getting more and more spam calls. Most will wait for a person to speak. Then, a brief tone will be heard as they enter the call. I know hang up at that tone. Some have no one on the line at all but will hang up (with or without a tone) after I answer. As I understand it, many of these are robots searching for phone numbers where a caller is likely to get a human voice than an answering machine. I have begun to not pick up the phone and say "hello". Rather, I wait a few seconds. Often the other end hangs up. I figure that, if its a friend or family member, they will offer the "hello" if they don't hear me. I will get these calls from morning until after 9:00 PM and they'll number almost one per hour. I do expect an increase in robot calls during political seasons but those haven't hit yet.
I think I'm lucky but they have free phone # blocking and now NOMOROBO.
CNET write about it at https://www.cnet.com/how-to/screen-unwanted-calls-without-one-at-a-time-blocking/
But it's up to the caller to verify whether our number is on the list. It seems to work well for Australian numbers and any mistakes tend to be corrected. But it doesn't work for overseas calls, usually from the Subcontinent, or withheld numbers.
Subcontinent accents get a "Good Morning, what's the weather like in Bangalore?" Usually produces a hangup, though one guy said "I'm not in Bangalore, I'm in Mumbai." Duh!
Here, any call recording has to be notified before the call continues. So my other favourite response is "Good day, before you continue, I'm obliged to tell you that I'm an independent contractor working on a government security project and as such, all calls to this number are recorded with their origin. Are you happy to continue?" Rarely gets past "recorded"!
Be careful but have fun!