The tabs on this panel let you control the Call Alerts box and lets you assign sounds.
Alerts
You can control whether the Call Alert box is displayed in different situations.
You can also control how you are alerted to an incoming IM: either with a small IM Alert box or with the Messages window itself.
Sounds
You can assign specific sounds to a variety of actions or "events".
1.Select the Enable sounds check box and select the check boxes for each desired event, or clear the Enable sounds check box to disable all sounds.
2.You can change the sound for each event: select the individual event. The value in Sound preference will change. Select the desired sound.
You can import sounds; these will be added to the list of sounds you can choose from when assigning a sound to an event.