The Play Prompt
Continue building the Queued output branch of the Select Resource step by dragging a Play Prompt step from the Media palette in the Design pane and dropping it into the Queued icon under the Select Resource step.
Next, configure the Play Prompt step to play back a prompt informing the caller that the call is still in queue and awaiting an available resource.
Figure shows the configured Prompt tab of the Play Prompt customizer window.

Configure this Play Prompt customizer window with the same properties as in the first Play Prompt step of the icd.aef script (seeThe Play Prompt Step), with one exception:
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Prompt tab
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Prompt—QueuePrompt. QueuePrompt is the prompt variable that stores the .wav file that informs the caller that the call is still in queue.
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Because you enable the Interruptible option, a newly available resource interrupts the Play Prompt step and the Select Resource step connects the call.