The first "combo box" allows the dataset we are going to work with to be selected.
The second "combo box" contains all the possible Origin/Destination couples for
which a type of communication has not yet been defined.
The third "combo box" contains all the possible types of communication.
The “Source is a Capital” and “Destination is a Capital” check boxes allow for identifying whether the origin or the destination of the call is a capital.
The “Add/Modify” button allows for assigning or modifying the selected communication type to the selected origin/destination couple. When pressed, the source location, destination location and service type will be displayed in the list of defined origin/destination couples.
The “Delete” button allows for deletion of an origin/destination couple for which the type of communication was defined. This couple will then be displayed again in the second "combo box".
The process is finished when no origin/destination couple is displayed in the second "combo box".