Confirming the Caller Input
Drag a Create Generated Prompt step from the Prompt palette to the Design pane and drop it on the False output of the Successful icon under the Get Digit String step.
Then configure the Create Generated Prompt step to create a prompt to play back to the caller the digits received, in order to confirm the caller input before transferring the call.
Figure shows the configured Create Generated Prompt customizer window.

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Generator Type— telephone.number
Telephone.number is the generator type.
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Constructor Type—number
Number is the constructor type.
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Argument Information list box—extnXfer
The extnXfer variable stores the results of the number constructor.
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Override Language
Optional. Use only if the resulting prompt is played in a different language than the one defined by the contact in which the prompt is played back.
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Output Prompt—prompt
The prompt variable stores the value that results from this step.