IMSI / IMEI / GSM / 4G LTE / Catcher

Looking for a skilled person who is capable of designing / making / consulting on a portable IMSI /IMEI / GSM / 4G LTE Catcher device that is mobile (Use in a car and in the field) - meaning, once the unit is activated, it will receive all IMSI data of neighboring Phones and the ability to track specific phones when requested (aggressive). In order to complete such a task, the bidder should have strong knowledge of how LTE networks and signalling. Bidder MUST have an understanding of telecommunications and the different cell bandwidths that are currently being used. . I need it to intercept and decipher radio traffic and record from both BTS and phones. A5.1 deciphering required for the GPRS Internet traffic in 3g or 2g. Need a customized front end GUI for user to easily enter [login to view URL] to display phone number phone model and country of origin and network provider. In other words its called a Passive GSM interception system and/or also a Aggressive GSM / 4G LTE Interception system. Its intercepts traffic between the BTS and the phone and records and deciphers it using a A5.1 decipher unit which is connected to the system. Makes fake calls. Skills Required Telecommunications Engineer, C Programming, Computer Security, Embedded Software, Engineering, Linux, MySQL, PHP, Software Architecture, Software Testing, Web Security, Python Script, MAT LAB, ASTERIX Hardware.