This value records the sysUpTime timestamp at which this failed call was terminated, per the description, marking the moment the SVC was actually torn down. Comparing this to svcAtmFailedCallCreationTime gives the call's lifespan before failure, and comparing it across multiple table entries lets an admin see whether failures on this port are clustering in time (suggesting a shared triggering event like a link glitch) or spread out evenly (suggesting a steady per-call failure rate). A cluster of terminations within the same few seconds strongly suggests a common cause like a signaling-link reset rather than independent call-level failures.