Cisco Cisco IPCC Web Option Design Guide

Distributed gateways require minimal additional remote maintenance and administration over 
centralized gateways.

The media server for Unified CVP may be centrally located or located at the agent site. Media may 
also be run from gateway flash. Locating the media server at the agent site reduces bandwidth 
requirements but adds to the decentralized model.

Unified ICM private communications must travel on a separate path from the public communications 
between Unified ICM components. There are two options for achieving this path separation: dual and 
single links.

Dual links, shown in 

, separate Unified ICM Central Controller Private traffic from VRU/CM 

PG Private traffic.

Failure of one link does not cause both the Unified ICM Central Controller and PG to enter simplex 
mode, thus reducing the possibility of an outage due to a double failure.

The QoS configuration is limited to two classifications across each link, therefore links are simpler 
to configure and maintain.

Resizing or alterations of the deployment model and call flow might affect only one link, thus 
reducing the QoS and sizing changes needed to ensure proper functionality.

Unanticipated changes to the call flow or configuration (including misconfiguration) are less likely 
to cause issues across separate private links.

Cisco recommends separate links across separate dedicated circuits. The links, however, do not have 
to be redundant and must not fail-over to each other.

Link sizing and configuration must be examined before any major change to call load, call flow, or 
deployment configuration

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ICM A

ICM B