The Invalid Output Branch

If the Call Redirect step registers the destination extension as invalid, the script executes the Invalid output branch.

Configure the Invalid output branch of the Call Redirect step to set the value of the prefixPrompt variable to inform the caller that the extension was invalid.

The Invalid output branch of the Call Redirect step contains the Set step. Configure the Invalid output branch of the Call Redirect step by dragging a Set step from the General palette to the Design pane, and dropping it over the Invalid icon under the Call Redirect step, as shown in figure Name To User—Yes Output Branch of Implicit Confirmation Step.

Then configure the Set step to set the value of prefixPrompt to contain a system prompt that plays back a message to the caller that the extension is invalid when the script falls through to the final Play Prompt step (see The Call Redirect Step).