Caller ID says "MASSACHUSETTS".  Typically that ID is associated with cell phones in MA.  I did a little searching and that number is/was indeed associated with a mobile phone.

I picked up.  I never say "hello" until they say so first; I let their machine think that I am a machine (they'll be less inclined to re-call).  I heard someone say "hello".  I continued to say nothing.  The caller sounded American.  The noises in the background made it clear that this is a call center.  They hung up.

I called back later (using *67 to block my number).  The message I hear is, "Welcome to Verizon Wireless. The number you dialed has been changed, disconnected, or is no longer in service.  If you feel you have reached this recording in error, please, check the number and try your call again.  Announcement to switch to 8 dash 6."  So that is either their outgoing message or they have spoofed a disconnected number.

Either way, it's a call center with a spoofed number or the inability to be called back.  That means it's either a telemarketer or a SCAMMER.