Hi Bill. I've been asking the installer guy to help me out on the tone since last month but until now still no solution. There are no network connected and he guided me thru phone and i don't think he know how to do it for this problem. FYI, you no need to worry about me damaging the system as I've been maintained older NEC PABX system before (M100, IPS 2000). I'm confident to change any programing for SV8100, it just that I couldn't find any manual to change the transferred tone. Btw they didn't change any password.