This happens on my Sprint BBRY 8703e before every notification or ring. It is three extremely annoying high pitched tones that are known as the "BlackBerry 1" ringer from the 7290 BlackBerry. What upsets me more than anything is that my device does this even when the profile is set to Vibrate only.
I tried 3 different 8703's and they all had this problem. My co-worker who has an 8703e from Verizon does not have this problem.
All of my calls to Sprint have fallen on deaf ears. They need to understand that this is a flaw with their product.