81 is day ringing,82 is 12 sec. delay for day, 83 is 24 sec. delay for day/ 87 is night ringing, 88 is 12 sec. delay for night, 89 is 24 sec. delay for night.

one thing you may be missing is that you need to light the lines you want to ring, starting with the bottom button for line 1, button 2 = line 2, and so on