I didn't answer, they didn't leave a message... I blocked my number and called back, got a recording. It gives you the option to press 1 and be removed from their list... which sometimes will actually prompt them to add you to even more lists, so I hung up. Oh and the number is a landline in MD.
My GF received a call at 9pm from this number, and the woman (possible Indian accent) wanted to talk about her mortgage. This was one day after she made a querie to her mortgage company. Too coincedental, I think. My GF hung up after about a minute.