Any user with a RingCentral account can join E2EE meetings. However, only users who belong to paid accounts can initiate E2EE meetings. Scheduling and starting ad-hoc E2EE meetings are not available for free accounts.
Note: Users will not be able to join by telephone or SIP/H.323 devices, as these endpoints do not support RingCentral SDK to perform end-to-end encryption. You can turn on end-to-end encryption for both scheduled and instant meetings to mitigate risks and protect your sensitive information from SaaS vendors or any third parties.