A customer maintains a wholly centralized Exchange messaging environment in a single data
center located in Denver. The customer has a distributed Cisco Unified CallManager environment
consisting of three separate clusters. These clusters support the Denver data center plus three
large remote sites in Colorado Springs, Boulder, and Montrose. The customer plans to move from
their centralized 10-year-old legacy voice-mail system to a Cisco Unity Unified Messaging system.
Given the customer topology for call processing and messaging, what is your recommendation?

A.
You recommend centralized and distributed Cisco Unity servers. There are many choices
available to you because of the inherent call processing flexibility built in to a pure Cisco Unified
CallManager design. You recommend a hybrid solution to demonstrate to the customer the
flexibility of the product.

B.
You cannot provide an initial design at this time. The customer need for three Cisco Unified
CallManager clusters has brought the design process to a standstill. Tell the customer to fully
collapse the Cisco Unified CallManager clusters for Cisco Unity to fit into their environment.

C.
You recommend centralized Cisco Unity systems. Cisco Unity must reside as close as
physically possible to the message stores it will be servicing. Also, since Cisco Unity servers are
capable of servicing more than one Cisco Unified CallManager cluster, you offer a centralized
messaging and distributed call-processing design.

D.
You recommend distributed Cisco Unity systems. Cisco Unity must reside as close as
physically possible to the Cisco Unified CallManager clusters, and Cisco Unity servers must
maintain a one-to-one relationship to the number of Cisco Unified CallManager clusters in the
design. At a minimum you must provide a three Cisco Unity solution and the three solutions must
be distributed to physically mirror the layout of the Cisco Unified CallManager topology.