CallManager

CallManager, often referred to as Cisco Unified Communications Manager, is a software-based telephony and collaboration solution developed by Cisco Systems. It serves as the core call processing component of Cisco's collaboration portfolio. CallManager enables organizations to manage voice and video communications, integrating these functionalities with their data networks.

The primary function of CallManager is to provide call control and routing for IP phones and other communication endpoints. It handles call setup, teardown, and feature management, allowing users to make and receive calls, transfer calls, put calls on hold, and utilize other telephony features. It supports a wide range of Cisco IP phones, softphones, and other devices.

Beyond basic call control, CallManager facilitates advanced collaboration features. This includes integration with unified messaging, instant messaging and presence, conferencing solutions, and video conferencing. It allows for the creation of sophisticated dial plans, enabling users to dial extensions, access external phone numbers, and route calls based on various criteria.

CallManager is typically deployed on dedicated servers or virtualized environments within an enterprise network. Its architecture is designed for high availability and scalability, ensuring uninterrupted communication services. It relies on protocols like Skinny Client Control Protocol (SCCP) and Session Initiation Protocol (SIP) to communicate with endpoints and other network devices. The system's administration is managed through a web-based interface, allowing IT administrators to configure users, devices, call routing rules, and other network settings.