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Cisco IP Telephony Network Design Guide

78-11103-03

Chapter 1 Introduction

Single-Site Model

The overall goals of an IP telephony network are as follows:

• End-to-end IP telephony

• IP WAN as the primary voice path with the Public Switched Telephone

Network (PSTN) as the secondary voice path between sites

• Lower total cost of ownership with greater flexibility

• Enabling of new applications

For IP telephony networks based on Cisco CallManager Release 3.0(5), there are

four general design models that apply to the majority of implementations:

• Single-Site Model, page 1-3

• Multiple Sites with Independent Call Processing, page 1-5

• Multisite IP WAN with Distributed Call Processing, page 1-7

• Multisite IP WAN with Centralized Call Processing, page 1-10

The following sections summarize the design goals and implementation

guidelines for each of these models.

Single-Site Model

Figure 1-2 illustrates the model for an IP telephony network within a single

campus or site.

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