How to judge the HT-series products' working status by LCD?

Red LCD means in disorder. DHCP fails or WAN cannot be connected
Flash every 2 seconds (if DHCP has been set) HT600 fail to register
Flash every 2 seconds (if DHCP has been set)

Green LCD means in order. Hint information waiting Flash every 2 seconds Calling. Flash endless Call stoppage Flash every second.