
Chapter 6 Multisite WAN with Distributed Call Processing
Call Admission Control
6-8
Cisco IP Telephony Network Design Guide
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Operational Model
There are two parts to configuring the gatekeeper method of call admission
control:
• Gatekeeper configuration. This is where the network administrator
configures a Cisco IOS Multimedia Conference Manager (MCM) that acts as
the gatekeeper. Recommended platforms are Cisco 2600, 3600, or 7200
routers with Cisco IOS Release 12.1(3)T or higher.
Selection of a gatekeeper platform depends on the number of registrations
and the calls per second. As a rough guide, you can use the platforms
performance figures in Table 6-1.
• Cisco CallManager configuration. Each Cisco CallManager or
Cisco CallManager cluster must register with the gatekeeper as a single VoIP
gateway.
Table 6-1 Gatekeeper Platform Performance Numbers
Gateway Platform Memory
Maximum
Calls per Second for
Approximately 50% CPU
Utilization
Cisco 2600 56 MB 7
Cisco 3620 56 MB 10
Cisco 3640 128 MB 24
Cisco 3660 256 MB 35
Cisco 7200/NPE300 256 MB 50
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