Add Custom Roles to Standard Subscription Tier

Custom roles and permissions are currently available only for RingCentral Office Premium and Ultimate subscribers. That should be a standard feature and should be available to Standard subscribers.

Not having access to custom roles limits our ability to hide messages, meetings, and teams from our users - functionality that we already get from Microsoft Teams. Seeing these redundant features in the RingCentral app will only confuse our users and make their experience objectively worse. We use RingCentral strictly for phones and should not need to pay extra to get access to fewer features.