Due to the flexibility of IP network, openness, VoIP brought about by the huge profit space as well as the national regulation, some illegal personnel are to carry out underground IP phone, commonly known as "information" smuggling, they use the basis of telecom operators network, IP telephone business constitutes unfair competition; Shunt the telecom operators of long-distance telephone business income, disrupted the market order, and for users, has has developed from a "want to save money, use IP" into "want to save money, use underground IP", although it was possible to do not have the good quality of service, so if there is a way to find and stop the existence of the phenomenon of illegal VoIP operation? This article will do for you in detail,
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