Cisco Unified Contact Center Enterprise Solution Reference ...

Chapter 2 Deployment Models
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IPT: Clustering Over the WAN
The link must be a dedicated circuit and not be tunneled across the highly available (HA) WAN. See
Best Practices, page 2-27, at the beginning of the section on IPT: Clustering Over the WAN, page
2-27, for more information on path diversity.
Unified ICM Central Controller Private and Cisco Unified CallManager PG Private Across Single
Link
A single link, shown in Figure 2-12, carries both Unified ICM Central Controller Private traffic and
VRU/CM PG Private traffic. Single-link implementations are more common and less costly than
dual-link implementations.
Figure 2-12 Unified ICM Central Controller Private and Cisco Unified CallManager PG Private Across
Single Link
Site 1 Site 2
PG A
ICM A
ICM B
PG B
Advantages
Less costly than separate-link model.
Fewer links to maintain, but more complex.
Best Practices
The link does not have to be redundant. If a redundant link is used, however, latency on failover must
not exceed 500 ms.
Separate QoS classifications and reserved bandwidth are required for Central Controller
high-priority and PG high-priority communications. For details, see Bandwidth Provisioning and
QoS Considerations, page 11-1.
Link sizing and configuration must be examined before any major change to call load, call flow, or
deployment configuration. This is especially important in the single-link model.
The link must be a dedicated circuit fully isolated from, and not tunneled across, the highly available
(HA) WAN. See Best Practices, page 2-27, at the beginning of the section on IPT: Clustering Over
the WAN, page 2-27, for more information on path diversity.
Clustering Over the WAN with Unified CCE System PG
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Clustering over the WAN using the Unified CCE System PG looks similar to clustering over the WAN
with Unified IP IVR, but it has an additional set of challenges. Instead of using separate peripherals for
each of the Unified IP IVRs, the single Unified CCE System peripheral is controlling all of the
Unified IP IVRs and the Cisco Unified CallManager.
Cisco Unified Contact Center Enterprise 7.x SRND
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