i'm sure that this is possible.
at version 4034 you can select different audio devices, which play the sound:
icrophone device: USB Headset
Ringing device : SigmaTel Audio ==> soundcard of my Laptop with integrated speakers
Playback device : USB Headset
Now all ringtones AND dialingtones are played by the intern speakers of my notebook.
The spoken words are played by ma headset.
BUT the problem is, that the DIALINGTONES shouldn't be played also by the RINGING Device.
So the RINGING DEVICE should be SIGMATEL AUDIO (speaker, which i can hear also if i don't have the headset on my head) and DIALING DEVICE should be the same as PLAYBACK DEVICE = USB HEADSET (so that only i can hear the dialing tones).