What is Ajax line-crossing detection?

Ajax line-crossing detection creates a virtual boundary in a supported camera view and generates an event when a selected person, pet, or vehicle crosses it in a defined direction. Supported configurations can use up to four lines per camera and may create a notification or alarm, record video, and activate selected Ajax sirens. Availability depends on the camera and NVR configuration; Ajax DoorBell and IndoorCam do not currently support this feature.