
Chapter 6 Multisite WAN with Distributed Call Processing
Call Admission Control
6-14
Cisco IP Telephony Network Design Guide
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Figure 6-8 Receiving a Call Through the Gatekeeper
Site 2
IP
V
Cisco
3600
Cisco IOS
Gateway
x2222
Zone 2
ARQ
ACF
PSTN
IP WAN
Local Cisco CallManager identifies remote
Cisco CallManager by E.164 address in H255 setup
information of incoming call. Local Cisco CallManager
uses its route patterns to verify validity of calling device
and to determine amount of bandwidth needed to
complete the call.
Local Cisco CallManager sends ARQ to gatekeeper,
requesting the required amount of bandwidth.
1)
2)
Gatekeeper confirms admission fo the incoming call.
3)
49084
2
3
1
Incoming
H255 Setup
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