4.3.4 CTI HOOK for global

Several calls at once can take place on each station or port. HOOK for global is a special type of hook that combines the individual calls on the port and station into one status. So, if we register this type of hook we will receive notifications always for the specific port, or station, as the case may be, with one status, which is created by combination of all call statuses on the individual objects. This HOOK is useful for example if we want to monitor status of a station and we only have one LED to display it.