Chapter 9. Call Admission Control (CAC)

This chapter discusses the Call Admission Control (CAC) QoS capabilities, and includes the following topics:

  • Definition of CAC

  • Resource Reservations Protocol (RSVP)

  • Cisco CallManager CAC techniques

  • H.323 gatekeeper CAC tools

  • Cisco IOS CAC tools other than RSVP

Call admission control (CAC) mechanisms are critical to ensuring overall quality for all traffic types that traverse converged networks, particularly for protecting voice from other voice traffic, and interactive video from other interactive video traffic.

All the QoS mechanisms discussed so far have dealt with how to treat traffic already admitted to the network. CAC is the first toolset that addresses how to keep traffic off the network (admission) when ...

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