Different IVR routing strategies include direct, location-based, time-based, skill-based, least-occupied routing, and more.
F A Q | IVR Call Routing
Call routing occurs automatically once set up while IVR uses phone menus to provide callers with options for direct routing.
IVR is interactive voice response and it works similarly to call routing as in it directs callers to their desired destination. The key difference is that it provides callers with menu options to choose from, and based on those choices, routes them to the right destination.