According to this doc, that data point is useful for monitoring CUBE.
http://www.cisco.com/c/dam/en/us/products/collateral/unified-communications/unified-border-element/C...
The definition said dialCtlPeerStatsFailCalls - Number of failed call attempts to this peer since system startup.
It is an actual call attempt. If it is still trying to match the call shouldn’t be attempted as it should find the best match before attempting the call.
