The function allows you choosing a number that you want in order to
light up during the call to traditional telephones. You can also unlist the
number and it won’t light up.
Direct Inward Dialing Support. This function is offered by telephone companies with the goal that ATC clients could connect all range of company numbers to one or several lines. The aim is to give a personal number to every employee without having to connect it to a separate phone line. Thus, all telephone traffic can be divided and controlled more efficiently.