Samsung SGH-X426ZSAAWS - Manual (Page 83)

Sound Settings 79
The following options are available:
Error Tone: sets the phone to play an error tone when you
make a mistake.
Minute Minder: sets the phone to beep every minute
during an outgoing call to keep you informed of the length
of your call.
Connect Tone: sets the phone to beep when your call is
connected to the system.