Telephony is a unique business. I initiate a call on a device that I carry in my pocket, and in seconds I can speak to someone on the other side of the world. The call travels over routes owned by a series of different companies through many different jurisdictions. This works because they have agreed to a system of billing that will ensure that if they make the connection happen that they will get paid for it. It is that agreement that enables connections to be so reliable to make, but it also enables toll fraud.