I took a call from them, they are United Digital Solutions in Van Nuys, CA, (Los Angeles Area) and they sell aftermarket toner for laser printers. I happened to be interested and told them to call me back in 10 minutes, the next call came from an unknown number.
Just got a call at our law office from this number. Based on all the information above, I just filed a complaint with the Do Not Call registry (www.donotcall.gov). Thanks everyone for all the information.