Samsung SGH-X427 - Manual (Page 84)

Sound Settings
79
The following options are available:
Error Tone: sets whether or not the phone informs you
when you have make a mistake.
Minute Minder: sets whether or not the phone beeps
every minute during an outgoing call to keep you informed
of the length of your call.
Connect Tone: sets your phone to beep when your call is
connected to the system.