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2019-01-23 It would depend on the service level for your account. Contacting your Customer Service Manager would help you determine if your account includes Custom Roles, that is what to ask about. If the account you are paying for includes Custom Roles, you can ask for assistance from Support for creating a template for all the users you want to exclude from Directory (Contacts) Access then apply it to all of them. That might be the quickest way to achieve what it sounds like you are trying to do.

https://support.ringcentral.com/article/10640-user-roles-permissions-create-custom-role.html