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Depending on the type of phone a user has, call back when free is accessed by dialing a short code while listening to internal busy tone, selecting an option from an interactive menu or pressing a programmed DSS/BLF key. Callback when free can also be activated from Phone Manager. You can also set a callback when free or a callback when next used using a short code without attempting a call. In use, it allows IP Office users to carry on with other work and let the system initiate a call for you when the extension becomes available.

• When calling an extension that is busy, set the system to call you when the extension becomes free. This feature is also called "Ringback When Free".
• When calling an extension that just rings, set the system to call you when the extension is next used. This feature is also called "Ringback When Next Used".

Avaya IP Office Phone System Features List