This article will show you how to do the following:
Allows users to assign the next action to their callflow. These actions range from other users, voicemail boxes, callflows, and groups to provide more on-the-fly customization
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If the callflow breaks for some reason, click on the user's settings and disable Next Action, and click save to rebuild the default SPBX callflow.
When the next action feature is disabled the voicemail box will be re-enabled.