[gr-gsm] Need help regarding application

Dear OsmocomBB Team, My self Mayank Saka, I am a college student of IIITD, I am a researcher. And we have a project, (Telecommunication vulnerability) We had a word with ettus support team, they suggested us below devices for ss7 or telecommunication vulnerability project. 1.USRP B200 2. TCXO GPSDO module Please help us what kind of device and application we need or our project we want intercept SMS or call, please guide us application and devices so we can buy and continue our project Thanks and Regards