Telemarketer for a real estate company soliciting my business. Long silence at the beginning of the call, then caller started his sales pitch. When I brought up the Do Not Call list, he said he was familiar with it, but he couldn't quite understand the concept of not calling someone on the list for the purpose of soliciting my business. It took a while to explain. The number belongs to a real estate agent in Montgomery County, MD; I don't know whether the caller is spoofing the number or really is an employee.