Cisco CallManager is a central component of a Cisco IP telephony and video telephony solution.
It is designed to perform basic control functions in the system, such as managing the establishment of telephone and video connections and providing additional functions for subscribers of the corporate ip telephony network. Integration of applications, including voice mail / unified messaging (Unified Messaging) systems, multimedia meeting systems, interactive speech interaction (IP IVR), etc. also implemented using cisco

CallManager based on the open API supported by it. Cisco CallManager also provides a wide range of tools for the system administrator to configure and manage an IP telephony / video telephony system. The Cisco CallManager software uses the Cisco Media Convergence Server (MCS) as well as certified third-party server models (IBM, HP) as a hardware platform.


https://www.cisco.com/c/en/us/products/collateral/unified-communications/unified-communications-mana