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National Fraud Management System






One of the ways governments can use to fight SIM Box operators is to reduce the gap between interconnect and on-net retail rates. However, this means that retail marketing is restricted in its marketing options. GI Solutions utilize a fast and bullet proof monitoring service to detect and report SIM Box usage. It helps operators to reduce SIM Box activity to zero, enabling marketing to have full freedom in pricing.


The system will perform test calls towards operators’ network from a large number of routes:

·         Mobile operators, including MVNO

·         Fixed operators, including incumbent and alternative carriers

·         VoIP operators such as Skype and Gizmo

·         Calling cards

·         Carrier routes

·         Carrier exchanges




The calls terminate on a probe equipped with the operator’s SIM cards.


A regular test call for SIM Box Detection consists of a call attempt phase only. Once the ringing tone is detected, the result is stored and the call is aborted. All probes send their results back to our central database where records are correlated and stored. A record is created in GI Solutions’ systems for every test call. The test schedule can be tuned in various ways (peak versus off peak...) to answer specific needs.


The calls are terminated on the SIM cards provided to GI. These cards use a special feature in the switch that does not take into account the ‘Presentation Indicator’ when forwarding the CLI. Even if the CLI is put on ‘Restricted/Private’, the probes will be able to log the CLI. This feature is commonly known as CLIR Override, or CLIP override / SO-CLIP.




A unique automated system analyses every CLI, pointing out all possible quality problems and grey routing. When the calling party is identified as belonging to your network, it is certain that the original call is being transmitted through that MSISDN, meaning that the call is routed through a SIM Box.




Reporting options range from real-time notifications in case a SIM Box is found, up to a monthly overview and reports with a detailed analysis.




Once detected, most mobile operators deactivate the SIMs used by SIM Box operators, based on exclusion of third party traffic in the contracts or general conditions. The faster an operator deactivates these SIM Boxes, the faster a SIM Box operator will stop its bypass business.




Adding a clause in the SIM contract or general conditions stating that the operator has the right to change the tariff plan once third party traffic is detected is another option. Rates higher than the interconnect fee will stop the profitability of SIM Boxes.


Off-net SIM Boxes

Test calls will also be made to the other domestic operators. This is necessary to verify if the SIM cards are being used in SIM Boxes towards other operators (off-net SIM Boxes), which has an equally large financial impact.

A limited amount of test calls is used towards each competitor. Of course, each operator is free to choose any other number. Test schedules will be adapted based on the results of the detection. If no off-net SIM Boxes are found, all tests will be used to detect on-net SIM Boxes.



The CLI provided by GI are by definition SIM Box numbers that are used to terminate third party traffic. As our platform only generates third party traffic and spoofing CLI on mobile networks is not possible, our methodology is bullet proof. The test results reveal SIM Boxes that are used for third party traffic, and only those.



The fact that our FMS generates effective calls on third party networks could ultimately be proven with the invoices we receive from those networks. Together with the operator’s CDR, this is a conclusive proof of usage for third party traffic, which is exactly what you need to be able to deactivate MSISDN used for SIM Boxes.



GI is provided by a number of SIMs with CLIR Override with +500 non-consecutive and new MSISDN linked to each SIM, as well as post-paid SIMs of each competitor. Providing a high number of MSISDN linked to the SIM cards is essential to avoid detection of the test calls by fraudsters. The required number of SIMs may differ per program.


Remote Traffic Generation

Scan & Shoot

The FMS uses a unique detection method. Two separate test schedules will run:

All relevant routes available in GI Solutions’ portfolio are scanned for SIM Box usage throughout the contract. These low frequency ‘scanning’ tests will simulate human behavior, thus preventing detection by the SIM Box operators.



Regularly, our experts will launch a high number of tests on the routes that are affected by SIM Boxes, ensuring the maximum of SIM Box MSISDN being captured. This schedule is called ‘shooting’.



Both these test schedules are flexible and can be changed according to specific needs. The advanced ‘Scan & Shoot’ detection scheme will change routing constantly to maximize the detection results. This guarantees the highest test efficiency ratio on the market. The same methodology will be used for both on-net and off-net testing.


Network Operation Centre




GI infrastructure is built upon a state of the art network with optimal availability and multi scale –multi layer redundancy.

Our NOC spread in two different time zones is multilingual and operates 24 by 7 by 365 to provide high level quality of support via remote alarm monitoring and management, carrying out recovery actions and escalating failure situations.

Technical Helpdesk is the central focal point responsible to receive all technical complaint and act as the centralized interface with the operators internal departments. The technical helpdesk team shall liaise with the Operators Customer Care Centre handling the end-user complaints and technical issues related to the network, and will communicate these issues within the operators.

The network monitoring and technical helpdesk team shall also perform following First Line Maintenance (FLM) activities:

·         Event and Alarm Management including automated tool based Trouble Ticket Management

·         First Line Fault Remote Diagnostics

·         Remote Corrective Actions

·         Performance Reporting


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