Which tool is used to view CUCM call signaling details?

• A. SDL/SDI logs
• B. RTMT logs
• C. Syslog
• D. Call Detail Records

Answer: (A)

When diagnosing call setup and teardown, you want visibility into the exact signaling messages that CUCM exchanges with endpoints and gateways. The Signaling Data Logger (SDL) together with the Signaling Data Interpreter (SDI) is designed to capture and present those call signaling details, such as SIP or H.323 messages and the sequence of steps in a call. This level of trace lets you see each INVITE, 200 OK, ACK, BYE, and related signaling flow, helping pinpoint where a problem arises in the call path.

RTMT logs provide general system and performance information, not the detailed call signaling itself. Syslog collects generic device messages, still not the granular signaling exchange. Call Detail Records record high-level call metadata (who, where, when, duration) but not the actual signaling messages. Therefore, SDL/SDI logs are the best tool for viewing CUCM call signaling details.