
Chapter 6 Multisite WAN with Distributed Call Processing
Call Admission Control
6-6
Cisco IP Telephony Network Design Guide
78-11103-03
Figure 6-4 Dynamic Routing of Calls Between Sites
In this model, it is important to be able to detect when the IP WAN is down or
when there are insufficient resources for the IP WAN to handle additional calls,
so that calls are sent across the PSTN only when necessary. This type of dynamic
routing reduces calling costs and is the benefit that call admission control brings
Headquarters
Regional Center
Branch Office
Telecommuter
V
IP
IP
IP
IP
IP
IP
IP
IP
IP
IP
49080
V
V
PSTN
IP WAN
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Router plus
voice gateway
Router plus
voice gateway
Router plus
voice gateway
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