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Chapter 5 Dial Plan Architecture and Configuration

Cisco CallManager Dial Plan Architecture

5-2

Cisco IP Telephony Network Design Guide

78-11103-03

allow for greater scalability, flexibility, and ease of use, while tighter integration

of Cisco CallManager and Cisco IOS gateways allows for larger network

deployments.

The Cisco CallManager dial plan architecture is set up to handle two general types

of calls.

• Internal calls to Cisco IP phones registered to the Cisco CallManager cluster

itself

• External calls through a PSTN gateway or to another Cisco CallManager

cluster over the IP WAN

Figure 5-1 shows a network designed to handle these two types of calls. With a

well-designed dial plan, voice calls preferentially use the IP WAN and are routed

to the PSTN only if the IP WAN is down or unavailable. This routing is

transparent to the user.

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Cisco WS-X4604-GWY - VoIP Gateway Spezifikationen Seite 110