I have no answering machine. I normally do not answer calls from those I do not know. This number started calling me about the same time I started getting calls from MarketLink (515-309-2041), Seniors Health (213-710-8139) and "Out of Area 0 --- --- ----". All but Seniors Health use the same 'ring 4 - 6 times and hang up' routine. All of this started the last week of February 2010.
I am posting about each of the other numbers I listed separately from this post as well.