Users are complaining about dropped calls, so a network engineer needs to troubleshoot Cisco Unified Communications Manager to view concurrent calls and dropped calls. Where does the engineer…

Cisco Unified Serviceability is used for service management, alarm configuration, trace collection, and audit log review; it does not provide call volume or dropped call activity reports.

Cisco Unified OS Administration is an operating system-level management portal for tasks such as software upgrades, certificate management, and hardware status checks - not for call-level reporting.

Cisco Unified Communications Manager Administration is the dial plan and device configuration interface; it does not include real-time or historical call activity reporting dashboards.

Cisco Unified RTMT provides purpose-built performance monitoring dashboards and report generation features that include call activity metrics such as active concurrent calls, call completion rates, and dropped call counts, making it the correct tool for this troubleshooting scenario.