This log is also useful to originate calls, a powerful variant of the call back feature. It should be treated as a subdirectory of the hierarchical user-phonebook. Data Functions ISDN provides the user with digital channels for data transmission. The GTI should allow control of these connections like it does for voice circuits. Double-clicking or opening a selected entry launches a connection.
Windows show subdirectories, the active voice connections or data connections.
Note the subdirectory 'Yellow Pages' representing the public yellow pages. The shading on the right sides of the tool-icons indicate further menus or dialogs. The selected view mode for figure 2 is 'sorted by call frequency'. The menu choices reflect the criteria given above. The view mode can be changed to the modes in figure 3.