
Chapter 1 Introduction
General Design Models
1-2
Cisco IP Telephony Network Design Guide
78-11103-03
Figure 1-1 Composite Model
Large campus
(Up to 10,000 users)
Telecommuter
(Without local call processing)
Branch office
(With local call processing)
Branch office
(Without local call processing)
V
V
V
IP WAN
Rest of
world
Cisco IOS
gatekeeper
PSTN
IP
IP
IP
V
IP
IP
IP
IP
IP
IP
IP
40763
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