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A Cisco Telephony Architecture Evolution

Chapter Description

This chapter introduces the concept of ROI, and provides the background and reasoning behind Cisco's decision to migrate to an all-IP network.


This chapter provided the background on why Cisco decided to migrate to an all IP network, included a discussion on ROI, and described the architectural evolution from the beginning of the migration to IP Telephony. The chapters that follow will provide you with the knowledge and tools to plan, design, implement, operate, and optimize your IP network.

Figure 3Figure 1-3 Cisco 2001 San Jose Campus Environment