The Cisco MCS 7816-I3 Unified Communications Manager Appliance is an integral part of a complete entry-level architecture for a new generation of high-quality unified communications solutions that operate on enterprise data networks. This powerful platform is a solution that is easy to deploy and highly cost-effective, and it delivers the high performance and availability that today's enterprise networks demand. The server appliance is preinstalled with an operating system and the Cisco Unified Communications Manager 6.0 or 5.1 application. Formerly known as Cisco Unified CallManager, Cisco Unified Communications Manager is fully operational upon startup, requiring entry of just a few configuration variables such as IP address and domain.