This number called today to sell walk in tubs. Wanted to come to my home for a thirty minute consultation "sales pitch". The Caller ID displayed the source as ATT otherwise I would never have answered. I asked the person why they used the source at ATT and she said it must be the other company that shares their facility. When I to her I was on the DO-NOT-CALL list and have been on the list for over ten years, verified annually and this type call violated the purpose of that list she said that they use that list but she would add my number to their system and would not call again.
When redialing the source of the call was an unused line, this is obviously a robo-call.