Voice over IP First-Step

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? ...