The default mode for the RingCentral IVR is single-level. Switching to multi-level allows deployment of a more sophisticated auto-receptionist menu to handle a large volume of incoming calls at one or more company locations. The multi-level IVR function supports up to 250 menus for each account you create. Multi-level IVR is available to RingCentral Office Premium and Enterprise customers in the US. To learn more click here .