up.time is Uptime Infrastructure Monitor is not currently able to natively play a sound or audible alarm on the monitoring station (or a target PC) to indicate a service outage. However, this capability can be accomplished with a combination of custom scripts and the Script Alert option in an alert profile.
In a simple form, the up.time the Uptime Infrastructure Monitor Windows Popup Alert option within an alert profile will cause a notification sound when the popup window appears.