System uses DDI "Default global line" as the primary line of the user.
On the screen, in turret state area, corresponding line number (i.e. 81302) is associated to user identity.
Note that local line group also contains one item corresponding to the DDI line but shows as "primary" one.
Pressing button for more than two seconds either in "DDI Sharing Lines" or in "Local Lines" group provides access to DDI line edition form.
Note that "DDI calls" applet is only available from "DDI Sharing Lines" group.
