However, in these days, there is an abuse of the technology called “spoofing” that is uncontrollable. Fake movie Numbers (555-555-5555) have been used, the numbers of “Satan” (666-666-6666), and even the numbers of pi (314-159-2653). Services that allow anyone to do the same practice are available everywhere online.
In fact, the services continue for people who will use them legitimately, by right, legally and without intent to harm or deceive. Although the attempt to screen users so that only people who “should” make use of these services. However, there is no real way to stop the consumer through use of the services offered.
The costs are not high (usually with a monthly service fee and / or a fee per minute for each call). This allows the user cost are shown as a caller identification number.
The technology itself works either through PSTN or VOIP, calling service and essentially controls the call spoofing its entire length. In fact, this company provides a legal disclaimer as not being responsible for anything you want users to do or say to use the service.
VOIP offers a great opportunity for simulations of standard PSTN call. Using this technology, in order to participate in the jokes is violating the law. Nevertheless, it is spoofing services themselves are still legal. The technology is allowed, which is how it is used, which can be processed.
Less common, but are also available technology called spoofing, which emulate the Bell 202 FSK signal (also known as orange boxing) and access to the switch of the SS7 network to appear – even to the operators of the company phone – that a call placed by another existing phone number. Finally, and very rare, is VXML, which grew popular VoIP before, but now is pretty stagnant.
