How is the user of a number authenticated?
Users could be corporations, individuals, government agencies, military organisations, and hosts of other non-individual users. Service providers typically assign large blocks of numbers to these entities. The telecom manager within these entities then assigns numbers to users, so even the service providers cannot identify the users for a large portion of the allocated numbers. This is an unresolved issue but one that must be resolved prior to deploying a robust and secure ENUM service. It is likely that the service provider that allocated the number(s) to the user will be involved in the process of authentication.
