Call Queue Call-back feature.

Please note that the call queue call back feature is condition based - not an on/off switch.

The option for a callback prompt is only available to those inbound callers who exceed the max expected wait or queue length conditions.IE: Max Expected wait - those that fall over the set time or try to join a queue that has already exceeded the wait period. Max Queue Length - say 10 are allowed/set for a queue maximum, and the 11th caller dials into the queue. They’ll meet the condition that would prompt for a call-back.

So, while the option to enable callback is yes/no.. the inbound caller must meet the conditions in order to hear the prompt.