Motorola Droid 2 :: Short - Odd - High-pitched Ring-tone When Make A Call

When I make a call there is a short, odd ring-tone that occurs just after I press Dial and before the normal ringing sound begins to indicate the call is going through.

It's about 1/2 second long, can be quite loud sometimes, and is kind of high-pitched....sorry, it's hard to describe. The tone modulates up and down quite fast - da-dum-da-dum-dum (if you can imagine).

I tried re-programming the phone, and also updating roaming, and it's still there every time I make a call. I haven't made any changes to call settings to speak of...never had this on my D1.