Called hung up when I said hello.  Most likely telemarketer

When I answered, there was just dead air like when a telemarketer makes several calls at once and doesn't answer immediately when you say "hello".  If they can't respond immediately to my "hello", I'm not waiting for them to find out they got a live one on the line.  They called on a Sunday at 5:14 p.m.  Caller ID said a name was unavailable.