The document discusses the challenges facing telecom companies in upgrading their billing and revenue management systems. It finds that legacy systems cannot support the growing complexity of services needed to compete in today's digital environment. Additionally, mergers and acquisitions have led to a proliferation of redundant billing systems. The top priorities for telecom companies are restructuring roaming tariffs, consolidating revenue systems, and integrating billing with customer relationship management. Vendors need to offer flexible pricing and cloud-based or managed service solutions to meet telecom companies' modernization needs.