Voice emotes are emotes that have actual speech files that play out when you execute them. For example, typing "/inc" will cause your character to say "Incoming" and everyone that is near you will be able to hear that "Incoming" being played on the speakers. The following is a list of available voice emotes.

/assist, as
/charge
/cheer
/fire
/flee, run
/flirt
/follow, followme, fol
/goodbye, bye
/grats, congrats
/heal
/hello
/help
/incoming, inc
/no
/outofmana, oom
/raspberry, rasp
/silly
/thanks, thank, thankyou
/train
/wait
/yes
/welcome