Refiling is a call switching process from one user to another, in which incoming international traffic is replaced by the local one, in order to minimize costs. To do this, you should use the special equipment - VoIP GSM gateways. Gateway owners earn on the difference in the cost of international and local calls.
An elementary feature that allows you to "recognize" refiling is when you take an incoming call from abroad, the caller's number is not identified or identified but as a completely different, a local one. The other party, in turn, cannot call or send a message to the identified number.
To do refiling, you should use a set of on-net GSM channels, which are SIM-cards of local operators with net tariffs. Most gateways are unidirectional, i.e. the SIM card generates large volumes of outgoing traffic, but at the same time there is no incoming traffic. The significant prevalence of outgoing calls with incoming is used by GSM operators as a parameter to track refiling.
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Cellular operators annually lose a few million dollars because of refiling. Terminators substitute international traffic for the local one, "robbing" the mobile operators off potential profits. To prevent the loss of their losses, cellular companies are investing in the development of special software - the so-called AntiFraud systems. They analyze the monthly activity. And if they suspect refiling, they block numbers.
Those, who do refiling, use special software to simulate real user behavior in the GSM networks. In this way, you can reduce the number of SIM-cards that are blocked by mobile operators. Despite active work of antifraud systems to track refiling, entrepreneurs earn a lot of money terminating international calls as local ones.
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