Cisco Cisco Unified Customer Voice Portal 10.0(1)

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Cisco Internet Service Node (ISN) Product Description
OL-1250-03
Chapter 1      Introduction
Putting It All Together: Deployment Decision-Making
What capabilities does the routing client have to divert calls to a VRU and take them back later 
in order to connect the call to an agent?
The answer to this question does not influence the architecture so much as it impacts the call flow. 
There many variations in routing client capabilities. 
Once you have answers to these questions, you can use the decision trees presented in the next two 
sections to determine what ISN deployment model you should use.
Note
The resulting end points of the trees identify the ISN deployment model(s) needed as well as the VRU 
type information needed for the NAM/ICM configuration.