Definition
Call control refers to the management and coordination of telecommunication calls, encompassing their setup, maintenance, and termination. It involves a set of protocols and processes that govern how calls are initiated, routed, and handled between endpoints. This functionality is crucial for ensuring reliable and efficient communication, enabling features like call transfer, conferencing, and voicemail. For instance, a Private Branch Exchange (PBX) system uses call control to manage internal and external phone calls within an organization. It differs from simple call routing by actively managing the state and interactions of an ongoing call. Understanding call control is essential for network administrators and telecommunications engineers, particularly in domains related to network infrastructure and unified communications.