What do the lights mean on my Wessex Telephone Box

Help and Support > Wessex Telephone > Setup
Power light: when this light is solid, the box is switched on. If flashing, it is still connecting. 

Internet light (world symbol): the light is solid when the box is connected to the internet, and flashes when data is being sent or received.

Phone light: when solid the phone is registered and available. A slow blink means you have a voicemail. Blinking every second means your phone is off the hook or busy.