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A Cisco Telephony Architecture Evolution

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: Sep 3, 2004.

Contents

  1. Operational Benefits of Cisco IP Telephony
  2. ROI
  3. Where It All Started
  4. Cisco Architecture in the Beginning
  5. Cisco Architecture Evolution
  6. Summary

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.

From the Book

Road to IP Telephony, The: How Cisco Systems Migrated from PBX to IP Telephony

Road to IP Telephony, The: How Cisco Systems Migrated from PBX to IP Telephony

$44.99

Cisco Architecture Evolution

Figures 1-2 and 1-3 represent the evolution of the Cisco architecture and the migration of the technology. Figure 1-2 provides a view of how the network architecture looked in 2001 at the beginning of the migration. Figure 1-3 demonstrates how calls come in to the network, how they tandem through the PBX, and how voice mail and intercluster calling are performed.

Figure 2Figure 1-2 Traffic Flow Example of Voice Mail and Intercluster Calling

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