In a CUCM cluster, which statement about the publisher is true?

• A. The publisher performs all call routing decisions in real time.
• B. The publisher is the primary database/administration node; subscribers replicate the database and handle call processing.
• C. The publisher is used exclusively for archiving call recordings.
• D. The publisher manages only the licensing entitlements.

Answer: (B)

In a CUCM cluster, the important arrangement is that the publisher acts as the central Master Database and administration point. You configure devices, users, IP phones, dial plans, and other objects on the publisher, and those changes are published to the rest of the cluster. The subscriber servers keep a copy of that database by replicating it, and they carry out the actual call processing. This separation—authoritative data and administration on the publisher, with replicated data on subscribers used for handling calls—is what makes the stated fact true.

That’s why the publisher isn’t the one doing real-time call routing decisions, and it isn’t dedicated to archiving call recordings or solely managing licensing entitlements. Those roles are not the primary function of the publisher in a typical CUCM deployment.