The Active Calls report will show you all calls that are currently going through at that very given time. This data is presented to you in real time. This report is pretty straight forward, but it would be good to just highlight some of the columns that may not be so obvious.
Delay - This is the post dial delay of the call, which simply means how long before the end number presented a ring tone.
State - This shows you the current state of the call whether the call is connected, waiting to be connected or disconnected.