To set your personal status left-click on your Login to open the dialog window.
You can also change your presence status by calling the service number. This number is * 4, by default, but you can change it in the section "Service codes". Call this number to check your current status or change it by pressing on the corresponding digit.
By selecting the "Do Not Disturb" status , you make an incoming call impossible. The caller will be asked to leave a voice message, if your voice mail is activated.