Voted Best Answer
Jan 05, 2016 - 10:40 AM
At this time the only way to measure CAL consumption (To my Knowledge) is to enable eventlogging on the SQL servers then aggregate the logs for the devices/users that connect. There are caevats, (1) only 2008 onward, and (2) only on non-standard editions. Why? no idea.
MS knows it is a deficiency. I suspect that is why they are strongly suggesting the other license models and try to migrate you away from device/CAL model.