GSM Monitoring Interception System with A5.1 -A5.2 Decoding.It is a multi-channel tunable GSM Monitoring Interception system.Each receiver is independently tunable to any BTS of the GSM Network.It is intended to ensure interception and deciphering of voice conversation from standards GSM-850/900/1800/1900 Cellular network in stationary or in mobile environment.It also intercepts registration and service channel information from the cellular network. On line monitoring up to 16 duplex channels. Interception Monitoring and logging of GSM- 850/900/1800/1900 communication standards in stationary or in mobile environments. Automatic tuning of the Receivers,with a possibility of scanning and recognition of control channels and communication system parameters. Automatically detects,decipher the ciphering algorithms used on the network in real-time and recording of cell phone conversations,call related information,network information to the hard disk of the system. Direction Finding Equipment can be integrated with a digital map of the location into the System. Receiver's management with neighboring cell details for network handover information. Switching ON/OFF the recording of conversations, network information and other parameters. Display current status of receivers (recording/ scanning) and target numbers. Display subscriber's distance/location from the Base Station. Several STN-INT-GSX systems can be configured in a LAN environment to provide a near-exact physical location of the target and to form a Central Monitoring Station. Provision of reliable reception of the information from channels of cellular communication systems with possibilities of noise-resistant coding.