Got a call from the number. Answered with my name because I thought it might be work related and an automated system on the other end beeped and said "Good Bye".
I had the same experience as others. My mobile phone rang and showed the caller as MA, USA. I have friends in Massachusetts so I answered. Nothing on the line except a beep and an automated voice saying, "Goodbye." Annoying as heck.
What you have just experienced is the result of a "predictive dialer" that had more calls answered than agents available. Many if not most call centers use this technology to maximize agent utilization. They call 3 or more numbers at a time for each available agent knowing that most of the time only one of the numbers called will reach a person to be transferred to an agent. In the event that more answer, all after the first receive the "beep" and "goodbye" however the computer notes a live answer and reinserts your number into the calling queue. No answers or answering machines do not get recycled into the queue as fast.