Disable 'end call' tone? I would like to disable the "beep" that is played when I hang up.
My Android 2.3.4 phone has no option to do that in the settings. 

What can I do? Do I need to upgrade my Android version, or what?
For those who may encounter this in the future (trying to rip this tone perhaps?)
apparently, this tone is not saved locally as a file but rather appears to be generated on the fly by android: