Because /voxlist and /vox help are broken, I decided to look around on the Internet to find the voxlist. And so I found it on the facepunch thread for the mod, containing most (I think) of the words vox can say.

Mnp lähetti viestin:

I'm very sorry to bump this from 2014, but if anyone does care...

The Addon is fully functionable, except /voxlist and /voxhelp which directly lead to a 403 Forbidden. So to help, I've decided to rewrite the VOXLIST here.

Goodbye
Yes
No
Help
♥♥♥
Hole
Black
White
Blue
Green
Red
Yellow
Error
Malfunction
Core
Warning
bizwarn (Plays an alarm sound
And
Or
Of
The
Now
Get
Out
Gordon
Freeman
Mesa
Facility
Sector
Alpha
Charlie
Delta
Lambda
Team
Over
Quick
You
Me
Escape
Contamination
Breach

[/quote]

Here is more that are not in the original facepunch post:

Military

Black☆Star&ShuOuma(HoD) lähetti viestin:

train, water , light, helicopter ,electric,door ,shut , up,left,right (I will keep posting more as i experiment but thats what i got for now)

Administration

Tones:
buzwarn
deeoo
bloop

(Will add more, post words you have found)