[Asterisk-Users] Where to find info on #, *67 *82 etc?

[Philipp von Klitzing]

Hi there,

can someone point me to a resource where I can find a list and/or 
description of * built-in functions like transfer, call waiting etc? 

I know I can transfer with #, and read about *8 for call pick-up, but how 
do those (and more) exactly work, and what else is available I haven't 
found yet?

Thanks, Philipp