Drop the BRItargets.wav file in your CFS2 sound\action folder.

copy the files siren.wav, spitlose.wav, and spitwin.wav from your CFS2\sound
folder to your CFS2\sound\action folder. Unless you already have them there, or
don't wish to use them.

The rest of the sounds are from the British radio calls pack by the groundcrew.
See html file for web address.