What is CUCM call processing logic?

• A. The digital signage triggers route selection.
• B. Digit analysis and route selection based on CSS/partition.
• C. The gateway uses the CSS to fetch route lists.
• D. The DSP handles all digit parsing.

Answer: (B)

CUCM call processing logic is about how dialed digits are interpreted and mapped to a destination. It starts with analyzing the digits entered, then applying CUCM’s routing rules—such as route patterns and any required digit manipulation or transformations—and finally selecting a route based on the caller’s Calling Search Space and the partitions that control which routes are visible. In short, the system uses digit analysis plus CSS/partition-based route selection to determine the correct path to reach the destination (SIP trunk, gateway, or endpoint). The other options don’t fit because signage isn’t part of CUCM routing and the gateway or DSP don’t drive the routing decision through CSS/partition in the same way.