List of all options for: users.conf

Hi asterisk freaks!
I want to know, where I can found all the options I can use when configure users.conf

I found someone here: … users.conf
But…There are more options?? Like; setvar=?,videosupport=?,etc??

Where I can found iT? Or…users.conf use the same options like; sip.conf? uh?

Hope for you comments, thanksk.