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In Sound Manager, create a Folder to store your custom sound file.
Tools > Media > Sound Manager
Create: Folder
Folder Name: Inclement Weather Announcement
Create a sound file. See the 'How to create a sound file?' article, or complete the following steps.
Sound Name: inclement_weather
Folder: Inclement Weather Announcement
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Step 4:
Add the Global Variable in your Main IVR. See the 'How to use get global variables in Main IVRs' article.