> So the scammer would call; you would rightly hang up and call the 1-800 number printed on your credit card. Only you were "calling" through the scammer's fake

> So the scammer would call; you would rightly hang up and call the 1-800 number printed on your credit card. Only you were "calling" through the scammer's fake telco dialing sequence and... still be online with the scammer. Wouldn't the scammer also have to play a dial tone on the line (and eventual ring) to keep the ruse going?