Cisco Unified Contact Center Enterprise Solution Reference ...

Cisco Unified CallManager Redundancy
10-8
Cisco Unified Contact Center Enterprise 7.x SRND
Chapter 10 Sizing Cisco Unified CallManager 4.x and 5.x Servers
Table 10-1 lists the types of servers you can use for Cisco Unified CallManager for Unified CCE
deployments, the main characteristics, and typical agent limits. These limits are not guaranteed to be
possible in all deployment scenarios, but in normal call center deployments, these limits are typically
possible. However, in all cases you must use the Cisco Unified CallManager Capacity Tool to verify that
a specific system design will be supported.
Table 10-1 Types of Cisco Unified CallManager Servers that Support Unified CCE
Server Type Characteristics Unified CCE Recommendation
Standard server:
Single processor
Up to a maximum of 100 agents
MCS-7825
Single power supply (not hot-swap)
Non-RAID hard disk (not hot-swap)
(Not recommended for mission-critical
call centers above 50 agents)
High-availability standard server: Single processor
Up to a maximum of 250 agents
MCS-7835 with battery-backed
write cache (BBWC) installed
Redundant power supplies (hot-swap)
Redundant SCSI RAID hard disk array
(hot-swap)
(Maximum of 125 agents without
BBWC installed)
High-performance server:
Dual processors
Up to a maximum of 500 agents
MCS-7845 with battery-backed
write cache (BBWC) installed
Redundant power supplies (hot-swap)
Redundant SCSI RAID hard disk arrays
(hot-swap)
(Maximum of 250 agents without
BBWC installed)
The Cisco MCS-7815 server is not supported with Unified CCE deployments, but lab or demo setups
can use this server. It is, however, a supported Cisco Unified CallManager platform for Cisco
Cisco Unified Communications deployments only.
Cisco Unified CallManager Redundancy
With Cisco Unified CallManager, you can choose from the following two redundancy schemes:
2:1—For every two primary subscribers, there is one shared backup subscriber.
1:1—For every primary subscriber, there is a backup subscriber.
Due to the higher phone usage in contact centers and the increased downtime required during upgrades,
the 2:1 redundancy scheme is not recommended for CallManager deployments with Unified CCE.
Figure 10-1 illustrates these two options. This illustration only shows call processing subscribers and
does not show publisher, TFTP, music on hold (MoH), or other servers. For details on additional cluster
deployment and redundancy options, refer to the latest version of the Cisco Unified Communications
Solution Reference Network Design (SRND) Guide, available at www.cisco.com/go/srnd.
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