The programming code for the NIGHT SERVICE is *39.
On the CONSOLE press *00 (STAR ZERO ZERO), press an available button, and dial *39.
Now, the set up in the system and in the mail MAY require other steps as well. (Some of these things may or may not work just by default.)
Program the button, turn it on, and see what happens.
If it does what you want, GREAT!
If not, re-visit the forum.