Call Control

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What Does Call Control Mean?

Call control is a function in a business telephone switch or
PBX that routes telephone calls to the proper destination. Call control also
maintains the connection between two endpoints of a call. It is one of the major categories of communications traffic in VoIP systems.

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Call control is also known as call processing.

Techopedia Explains Call Control

Call control is a feature of PBX systems which determines where calls are routed and maintains the connections. For example, call control might detect when a call has ended, or can restart a call if it was terminated abruptly. Other phone services, such as call waiting, are implemented in the call control system. Because PBX systems must be reliable, writing the software for call control can be a lengthy process.

Call control is even more complex with the rise of VoIP and unified communications systems in the enterprise. In VoIP systems, call control uses the Q.931 protocol. Modern VoIP systems can include not only voice calls, but videoconferencing, which makes call control even more complicated than in traditional PBX systems.

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Margaret Rouse
Senior Editor
Margaret Rouse
Senior Editor

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.