Yes, there were a chain of people who didn't get the joke, I was just pointing out that 2400Hz wasn't a thing either, though now I see it was a thing, maybe sti

Yes, there were a chain of people who didn't get the joke, I was just pointing out that 2400Hz wasn't a thing either, though now I see it was a thing, maybe still is, thanks Wikipedia[] : http://en.wikipedia.org/wiki/Blue_box http://en.wikipedia.org/wiki/Blue_box