When I call this number back from an unlisted blocked number, it sounds like a real person actually picks up... but as you listen to the voice, you realize it's someone using a computer with pre-recorded phrases, as they repeated "Hello" a few times and then had the voice thank me for calling today and that they appreciated my time (despite the fact that I said nothing on the phone).  Clearly a spam, and now they're permanently blocked.

Phone rang around 6:00 PM this evening.  Didn't recognize the number, so I let it ring.  No message left on the answering machine.  Caller ID just said "Massachusetts", which is quite obvious in that 617 is the Boston area code.

Phone rang at least 8 times and would not go to voice mail.  Blocked it!!!  Said Somerville MA.