Mystery Solved. These calls are NOT coming from The Heritage Foundation. They almost certainly originate from telemarketer The Heritage COMPANY. http://www.theheritagecompany.com/
Called a few minutes ago, caller ID said "Heritage"
Hit the answer/hang up button quick on the cordless so I don't have to be annoyed by the ringing. Some days it's tempting to answer then blow a whistle into the phone. Maybe then they'd take a hint.