If you are looking for the feature codes, not knowing which hardware/software you have it is kind of hard, but on 9006 you can display the dial plan and see everything that is defined in the system.
Just use DIS-DPLN and for DAR choose "all". DPLN is 0, but the rest of the options you can probably leave blank.
This is what I use as a convenient quick reference quide to the feature codes, plus it is a handy way to keep track of your free extension numbers.