What must all callers do to make a call through internet-based relay services?

To utilize internet-based relay services effectively, it is essential for all callers to be registered. Registration ensures that the service can function properly, allowing users to access the necessary features tailored for their needs, such as compatibility with various communication devices and interfaces. By being registered, callers can also receive appropriate support and services that facilitate smoother communication, especially for individuals who are deaf or hard of hearing. This process enhances the overall reliability and efficiency of the relay service, ensuring that all parties can communicate without barriers.

While training, possession of a smartphone, or providing identification may be beneficial or required in specific contexts, they are not universally necessary for making calls through these services. The primary requirement is ensuring that callers are registered to access and benefit from the relay services effectively.