Case Study: How IMSI Filtering Simplified Troubleshooting for the CSP About the CSP The communication service provider (CSP) is a leading provider of digital services and communications solutions in Central and Eastern Europe with more than 24 million customers. It is currently operating in seven countries across Europe and gives access to global solutions. In Austria, the CSP encompasses approximately 5.5 million mobile communications customers and almost 2.3 million fixed access lines. The customers benefit from a global package of offers from one source: voice telephony, internet access, digital cable television, data and IT solutions, value-added services, wholesale services, mobile business and payment solutions. The CSP has approximately 18.000 employees and a turnov

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