Changing the Ready State
You can specify that you are unavailable to receive new inbound work items of each supported channel type (such as when you need time to complete after-call work, or you are taking a break). For each channel type, new work items are not assigned to you while the Not Ready state is set for that channel.
You can choose Change Ready State separately for each channel type, or for work items of all supported channel types. The toolbar button is a toggle.
If all channels are in Not Ready state, then the button is toggled down (appearing to be depressed). If any, or all, channels are in Ready state, then the button is toggled up.