Same here. Very annoying. Fax machine. At first the callerid said it was Anthem Health Care and then I started getting the same calls from another "Private Number' as well. Same area code and NXX though. I just pick up and hang up or it clogs up my answering machine. This makes no sense.
We have also been receiving multiple calls from this number at the switchboard at work. When I called the number back they have a message set up saying "if you have received faxed calls from this number to leave your number and it will be removed from their list and apologized for it, but what is really weird is they don't identify themselves...