The new snom phones (8XX series) the blf buttons have three colors: green, orange, red to signal presence with 3cx it is possible to monitor ringing and on a call. but it would be very good if a extension that is available is green and a extension that is away or out of office is orange. if a extension is offline the led should be off. some of my customers miss this function. at least status away or out of office should be visible.