Reports the current number of users AAA hasn't responded about at all, so SSG can't yet tell whether they're valid subscribers. These are distinct from cssgTalWaitingForAuthUsers in that no answer at all has come back, versus a request still legitimately in flight, and whether their traffic is allowed meanwhile depends on cssgTalUnidentifiedUserAllowTraff — a large, growing count here alongside a false allow-traffic setting means real subscribers are effectively being blocked by an AAA problem. A spike in cssgTalUnidentifiedUsers right after a AAA server restart would reflect the backlog of subscribers whose identity SSG still hasn't been able to confirm since the restart.