I use this script in an event called VR Off to shut down VR.

sub main ()

hs speak. hs plugin("ROC-Rnd") .random("VR off")
hs ListenForCommands FALSE

end sub

This wont work in reverse because speaker is not listening until after the voice command, speaker would have to have the option to run a script when it speaks (or instead of speaking) the attention acknowledge phrase.