Furthermore, NetNumber plans to participate actively in winning contracts at the ITU Member State level to provide Registry services under the public ENUM structure. However, while I support e164.arpa as one viable competitive option, I do not believe that the industry is best served by viewing a public ENUM implementation as the exclusive Tier-1 Registry option. For example, France will define a structure for the registration of E.164 numbers under country code 33, Germany under country code 49, and so on. A perceived strength of the e164.arpa model is that it derives authority from the existing PSTN regulatory model. By comparison, a potential weakness of the model is the widely distributed nature of the solution.
Complexity never comes for free.
Restricting ENUM to one public Tier-1 implementation imposes an artificial limit on the creative process. In a competitive market the focus of Tier-1 service providers will be to develop services that drive the utilization of ENUM services . Introducing competition to Tier-1 ENUM services has the potential to address many of the risks associated with an exclusive public ENUM model as described above. As such, the communications systems deployed within these closed user group environments will be required to query more than one Tier-1 ENUM service. As part of ENUM integration process, NetNumber provides an ENUM resolver that can be configured to simultaneously query several customer defined ENUM services and return prioritized results.