The calls are computer generated, comp makes multiple calls in parallel for each sales A$$ hole, and connects the one that was first picked up. Others are checked for other things , like fax VM or live, then call is dropped.
reporting this is the best option.
Repeated calls, telemarketing firm pushing PSE&G (Public Service Electric & Gas) "Worry Free" service contracts. Employees do not give you the chance to say you want to be added to the D-N-C list, instead just hang up on you. I filed a complaint with the FCC as the number they are calling is both on the national D-N-C list and a cell phone which is illegal to call for telemarketers. Go to http://www.fcc.gov/complaints to file your own complaint and lets hit these idiots with some fines.
Also calling the number back does give the option to be added the their D-N-C list but I doubt that will do anything.