AFAIK, no - not in the mission description.ext (as kju there suggests).
I tried this in various situations, particularly when making the script version of DSAI. Wouldn't it've been so much easier if I could've just pathed directly to the sounds in the sounds.pbo foldier, thus reducing the actual size of the script to just the .sqf files
But no, that sadly only works in an addon config. Unless someone has figured out something clever I've missed (and, please, provide an example mission, not speculation), it's impossible to access BIS sounds using only the description.ext : you need to extract the sounds you want from the BIS .pbo file and put them in your mission just like any other sound. Now - if you're making an ADDON then you can happily path to sounds wherever, but but...
So: just extract the .wss file (I suggest
pboView which will let you extract just that file without having to open up the whole shebang) and put it in the mission folder and then use the description.ext information kju provided.
Good luck!
Wolfrug out.