About sound profiles
You can set notification options, such as vibrate or tone, for the AIM® service for BlackBerry® devices in the sounds application. The AIM Alert item specifies how you are notified when a Buddy that you have set an availability notification for becomes available. The AIM New Message item specifies how you are notified of incoming AIM® messages.
Depending on the sound profile that is set in the sounds application on your device, you might not hear the audible notification that you have set for the AIM service for BlackBerry devices. For more information about sounds, click the Help icon on the Home screen of your BlackBerry device.