The document discusses the evolution of corporate communications from traditional telephony systems to unified communications solutions. It describes Siemens Enterprise Communications as a leading provider of unified communications software, networks, devices, and services. The document outlines the benefits of Siemens' hosted unified communications solution, including reduced costs, scalability, flexibility, and advanced applications like video conferencing and mobility. Customer case studies demonstrate cost savings and improved collaboration achieved through Siemens' OpenScape unified communications platform.