I didn't quite trust the number but answered it anyway because I do go to a chiropractor. (It was from "Chiropractors B") It was a very clever recording, a woman's voice saying a delayed "hello" or "hi" and then apologizing for not having her headset on right. When I asked something, it became quite clear that it was a recording, not a real person - but they sure made it sound like someone was on the line. I didn't stay on long enough to find out what the pitch was. It's the second time I've heard that (the first perhaps a couple of months ago), but I don't recall whether the previous call was from the same number.