Class of service

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Class of Service (CoS) is a queuing discipline. An algorithm compares fields of packets or CoS tags to classify packets and to assign to queues of differing priority. Unlike Quality of Service (QoS) traffic management, CoS does not ensure network performance or guarantee priority in delivering packets.

In Voice terminology:- Class of Service is used to define the features a phone will have on a PBX. CoS is also used on trunks to define if they are bothway, incoming only or outgoing only.

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