I have a Hikvision 7208HUHI-K2 Turbo 4.0 DVR with 16 IP cameras and 8 analog cameras. My analog cameras can't do any events, Why?
Because when "Enhanced IP Mode" is enabled allowing you to add more IP cameras, you loose the ability for the analog channels to do any king of events.
It's a trade off. Lower the ammount of IP cameras by disabling "Enhanced IP mode" to gain events for the analog, or "Enable Enhanced IP Mode" to allow more IO cameras, but loose events features for the analog cameras.