Appears to be a scam to try and collect personal information.   I told the caller earlier that there is no way I would give them ANY info on me.  They continue to call most every day, getting as far as "Hi, my name is _____.  I'm calling from my company's staffing department" before hanging up.  I had been  blocking the various numbers that begin with (972) 456, but the last few days I go ahead and answer just to see if they stay on for more than a few seconds.  Very odd since it wastes more of the scammer's time than mine.