Call admission control (CAC)

Call Admission Control (CAC) is a system used in telecommunications networks to manage and limit the number of ongoing calls or data sessions. Its goal is to ensure quality service by preventing network overload—when too many calls or data streams compete for limited resources. CAC evaluates each new connection request and decides whether to accept or reject it based on current network capacity and quality standards. This helps maintain stable and reliable service for existing users while accommodating new calls efficiently.