I extracted all of the sound files from Unreal Tournament 3 using Dragon UnPACKer 5. I have attempted to preserve the folders they came in as best as I could.
NOTE: When you decompress the files, it will come out to a little over 9 GB. I am sorry for this size but this is to preserve the many sounds that UT3 came with. There are folders with languages on them which aren't entirely necessary unless you want them. These folders, for instance, include sounds from the announcers and more. I have attempted to gather all of the sounds I could find in the game directory, which includes the campaign dialog.