You answered your own question. If you are on the Federal DNC list & you get a telemarketing call you can be sure on one thing, 100%. Your caller is a domestic, or foreign criminal trying to steal money, or personal information from you. Honest business' follow the DNC, which tells you everything about your caller.
A call from this number claimed to be from Sears and said it is time to renew some extended warranties. He had correct information on what will soon expire, but he offered me a price that does not match what Sears charges. He would not give me his name. I asked him for a phone number to call back after I make my decision and he rudely asked me why I would not renew right then. I told him that I want to think about it. He hung up on me.