Connection Admission Control As An Alternative
Connection-oriented networks (for example ATM systems) can perform Connection Admission Control (CAC) based on traffic contracts. In the context of Voice over IP (VoIP), this is also known as Call Admission Control (CAC).
An application that wishes to use a connection-oriented network to transport traffic must first request a connection (through signalling, for example Q.2931), which involves informing the network about the characteristics of the traffic and the quality of service (QoS) required by the application. This information is matched against a traffic contract. If the connection request is accepted, the application is permitted to use the network to transport traffic.
This function protects the network resources from malicious connections and enforces the compliance of every connection to its negotiated traffic contract.
Difference between CAC and traffic policing is that CAC is an a priori verification (before the transfer occurs), while traffic policing is an a posteriori verification (during the transfer).
Read more about this topic: Traffic Policing
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