Chapter 4. Meet the “Brain” of the Voice over IP Network

What You Will Learn

After reading this chapter, you should be able to

Explain how Cisco CallManager can replace existing PBX functions.

Describe options for grouping Cisco CallManagers together in “clusters.”

List various features available on Cisco IP Phones.

Identify features to secure an IP telephony network.

Describe how Cisco CallManager supports video calls.

Explain how Cisco CallManager secures voice transmissions.

Discuss how Cisco CallManager Express and Cisco Unity Express provide call processing, voice mail, and auto attendant features for smaller environments.

Do you remember the scene from 2001: A Space Odyssey where Dave Bowman is attempting to deactivate the HAL 9000 computer? ...

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