Which statement describes the role of digit analysis and partition in CUCM?

• A. It determines the QoS policy for call, not digits.
• B. It routes calls based solely on dialed digits without partitions.
• C. Digit analysis and route selection based on CSS/partition.
• D. It maps digits to IP addresses.

Answer: (C)

Digit analysis in CUCM looks at the digits you dial and uses the dial plan (route patterns and translation rules) to decide which route to use. Partitions are logical groupings of route patterns, and a Calling Search Space (CSS) defines which partitions a device or user can access. When a call is placed, CUCM first limits the candidate route patterns to those in the partitions visible through the device’s CSS, then applies the digit matching rules to pick the best route pattern and the associated gateway or trunk. In other words, routing decisions are driven by how digits map to route patterns within the partitions the user is allowed to reach.

That’s why the statement stating digit analysis and route selection hinge on CSS/partition is the best fit. It reflects how access control (CSS) and organization of route patterns (partitions) govern which routes are considered and chosen, rather than tying routing to QoS policies, or mapping digits directly to IP addresses.