Sound over RDP Workstation does not require any configuration.
Being installed on user computer it allows using local sound devices (like microphones or headsets) in remote RDP session.
Note: Sound over RDP Server must be installed on the remote PC.
It's very easy to check that all works fine. Just launch Sound Recorder in remote RDP session and try to record voice data via microphone.
If Sound Recorder recognize voice, all works fine.