NRENum is a DNS infrastructure that provides ENUM* protocol for academies. Managed by GÉANT it was designed to enable users to have an easy dialing mechanism to interconnect VoIP/Videoconferencing solutions and more.

And it is "public to query”, this is important because you can use service and test it before becoming a member.

MAGIC is fostering the adoption of the standard, for universal dialing using the Domain Name System (DNS) infrastructure.

*ENUM: It’s a technology standard used to translate telephone numbers into URL addresses (a domain name). As a result of work of the Internet Engineering Task Force's (IETF's) Telephone Number Mapping working group. ENUM is used to build dialling infrastructure for VoIP, and Videoconference networks at global scale.