I discovered that the default prechat "ring tone" is the Windows ballon pop up sound, C:/windows/media/windows XP balloon.
This is not usable as a ring tone!!! Changing this sound directly to a ring tone works, but then cause error as it is played every time a message is written. That is ofcource not good. (noisy).
Well, seems no one answers posts here - even on presales issues - so I figure I will spend my USD 500 on another Live support software that has a loud and configurable ring tone.
Bjørn-T