This document discusses the market for managed services for communications service providers' (CSPs') business support systems (BSS) applications. It finds that the market is growing as CSPs seek to improve agility, reduce costs, and focus on their core businesses. Leading providers in this market include telecom-focused companies like Amdocs, Ericsson, Huawei, and NetCracker, as well as general IT services firms, though telecom-specific firms have an advantage. The document analyzes the market positioning of various providers and finds that network equipment providers leading the market as CSPs prefer to work with managed services providers that combine network and IT capabilities.