With close to 3 million mobile customers and a network covering almost 99% of the Belgian population, Mobistar is one of the fastest-growing mobile operators in Europe. A subsidiary of Orange, S.A., Mobistar offers fixed telephony, Internet VPN and DSL, and other data transmission services as well. The company's internal network, which links offices and data centers throughout Belgium via a high-speed WAN backbone, supports business applications such as billing and customer service that are critical to Mobistar's success. IT staff had long relied on 'sniffer-like' products to troubleshoot such problems, but they couldn't provide historical data, required to have a pretty good idea of where the problem was before troubleshooting it, and couldn't furnish any business context. After installing an SteelCentral? AppResponse solution they were able to start analyzing traffic end-to-end.