Creates an line appearance button linked to the activity of a specified line appearance ID number. The button can then be used to answer and make calls on that line. For details, see Line Appearance Buttons.
The line appearance button user must also have at least one call appearance button programmed before line appearance buttons can be programmed.
Line appearance functions, assigned to buttons that do not have status lamps or icons, are automatically disabled until the user logs in at a phone with suitable buttons.