GSM Traffic Recording System
General Features, Operations and
GTReS is a multi-band fully passive GSM interception
system designed to record the entire traffic occurring between Base
Transmitting Stations (BTS) and Mobile Stations (MS) located within the
system’s operational range. This means literally tens or even hundreds
of simultaneous calls.
“Fully passive” means that:
- GTReS does not have any transmitting parts;
- GTReS does not interfere with GSM networks and mobile
- GTReS’ operation is completely undetectable.
Recorded information can be processed either on-line or
GTReS can intercept:
- Voice communication;
- SMS messages;
- Primary and secondary DTMF tones;
- Call related information
The system supports both types of encryption
implemented in GSM networks – A5/1 and A5/2.
A5/2 real-time decipher is a software based
solution; it works as a background application. Average deciphering
time is 15 msec.
A5/1 decipher is a separate device connected
directly or remotely to the GTReS.