The one red dot (in this case Avigilon) means no integration. The two yellow means there is integration possible, in this case via HTTP/TCP events from the camera to the VMSes (Exacq, Milestone, and Nx Witness). But it's user-configured and takes some time/skill to set up. Genetec gets a green because it captures the event out of the box.
Is this really a practical solution without integration to the ACS to filter out multiple entries following a valid card read for each one? Otherwise there will be a lot of nuisance alarms for people that have held a door open for the next person, but they have both diligently followed security SOPs and presented their cards first.
Would a better approach (although more expensive) not be to use Facial Recognition with a whitelist of staff and visitors?
I just wonder where this would actually work well in practice as it’s not unusual for two authorised people to be passing through an entrance at the same time (whether both badging in or not). Perhaps very small sites or low throughput doors? Even then would you really want an alarm every time two people came back from a meeting together? Or am I missing something?