How quickly do you want/need the call information? And what questions are you trying to answer?
An interaction that alerts an agent who doesn't pick up, and then rolls back into the queue, will count as a flowout on that user queue. If you enable Track Routing Exceptions in Interaction Tracker, you'll be able to find the agent in question when this happens, as well as the time, how long it was on the user queue, and the InteractionIDKey. Breaking out those items...
EE_FlowOutEvents_viw database view:
This will write flow out information as soon as it happens to the DB, depending on network speed, DB/PureConnect performance, etc.
Use EE_FlowOutEvents_viw.InteractionIDKey and join back to InteractionSummary.InteractionIDKey to find information about the call, including the CallEventLog. This can be done after the call disconnects, and deallocates from the system (generally 2-3 minutes post disconnect).
Use EE_FlowOutEvents_viw.EventDateTimeUTC and compare the AgentActivityLog.StatusDateTimeGMT to see the how long the agent was in ACDNotAnswering for this particular event/ring-no-answer scenario. This can be done after the agent changes their status from ACD Agent Not Answering.
You could tie other information from the DB together as well based on the InteractionIDKey, time of day (down to the second/millisecond), etc. Depending on what you are looking for, and when you want to see it (it could be an option).