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System overview
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Our specialized GSM catcher is intended for government agencies and law enforcement groups in order to collect basic GSM information (IMSI, IMEI) about handsets in the local area (airport terminals, prisons etc).
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By utilizing our special GSM Base unit it is possible to create a special outlook system that can detect the presence of the group of handsets in the place of interest.
Functional diagram of the “IMSI/IMEI catcher” by NeoSoft is represented below:
Operational overview
The Compact GSM Base unit forces GSM phones in its vicinity to register with it. Unlike others IMSI/IMEI catchers NS-17-1 does not need to transmit very powerful signals in order to force GSM phones to make the handover from the real GSM network into this micro network.
There are two basic selection modes of control for GSM catcher NS-17-1:
- Random (all handsets);
- IMSI or/and IMEI (only targets).
The system ensures selection of subscribers (targets) according to known IMSI or/and IMEI identifications. Also, it has the means of detection of such identifications according to the results of statistical processing of a list of registered subscribers.
The system operates invisibly, so that the mobile station subscriber is unable to detect it. The system does not interfere with the external mobile GSM networks.
Once the compact GSM Base Unit of gsm catcher NS-17-1 requests mobile phones to introduce themselves, i.e. to send their identities – IMSI and IMEI.
The Basic operational applications for IMSI/IMEI NS-17-1 are:
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« IMSI/IMEI catching » mode
This mode is intrinsic to the system and a part of all other modes. The Software of the system initiates operation of the base station. A cell is created (further – internal network) where the MCC, MNC and arfcn correspond to the parameters of one of the real cellular network operators that operates in this area (further – external network), the LAC differs from the same used in the real network. Mobile phones located within its operational area (further - subscribers) will detect activation of a strong channel and start the registration procedure. They provide the system with their IMSI, IMEI, TMSI (received in the real GSM network), classmark, KCN. In the “BTS control” program window a list of registered subscribers appears. For the subscribers there is no difference between registration in this micro internal network or the real external network.
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«IMSI or/and IMEI» mode
This operational mode is intended to select targets of interest (according to IMSI/IMEI identifications) from the total number of subscribers located within operational area of the system. This mode allows registration in the internal network only for subscribers listed in the target-list. The rest of subscribers will get refusal in registering in the internal network and go back to the EN. So, all resources of the system will be redistributed solely for escorting of sessions of the subscribers of interest. The system operates with these subscribers in the same way as it operates in « IMSI/IMEI catching » mode.
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«Targets correlation» mode
This mode allows the system to search for identifications of subscribers of interest according to information (IMSI, IMEI and their combinations) accumulated during operation of the system.
Some of the additional applications for IMSI/IMEI GSM catcher NS-17-1 are:
What is in the package?
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Carrying Case;
Technical Specifications of GSM IMSI/IMEI catcher
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