Dear colleagues, Following the earlier discussions on Public ENUM under e164.arpa, I have prepared the following draft liaison statement for the September 2026 ITU-T Study Group 2 meeting. In my draft I tried to: - clarify the RIPE NCC’s position following SG2-C-0196*, - support the confirmation of the revised interim procedures**, - outline how the responses to TSB Circular 123*** could inform the treatment of individual delegations, - and provide an updated overview of the operational status of the current delegations. I would appreciate feedback on my draft and I would appreciate it if you could share any comments or concerns, particularly on the technical, procedural or governance aspects, by 25 August, so that the RIPE NCC can incorporate the feedback before finalizing the submission. Many thanks in advance for your review. Regards, Hisham * https://www.ripe.net/media/documents/ENUM_liaison_statement_ITU_T_SG2.pdf ** https://www.itu.int/en/ITU-T/inr/enum/Pages/procedures.aspx *** https://www.itu.int/md/T25-TSB-CIR-0123/en To: ITU-T Study Group 2, September 2026 Meeting Title: RIPE NCC liaison statement on ENUM (e164.arpa) Dear colleagues, The RIPE NCC thanks ITU-T Study Group 2, the Telecommunication Standardization Bureau, the Internet Architecture Board, Member States and ENUM delegation operators for their continued engagement concerning Public ENUM under e164.arpa. The RIPE NCC operates the e164.arpa zone as the IAB’s designated operator under the established coordination arrangements involving the IAB, ITU-T and the RIPE NCC. 1. RIPE NCC position At the February 2026 meeting of Study Group 2, the RIPE NCC submitted contribution SG2-C-0196. The contribution arose from an operational question concerning support for ENUM domain objects through the Registration Data Access Protocol, but also raised broader questions concerning the future status of ENUM and e164.arpa. Following subsequent engagement with the IAB, ENUM delegation operators and members of the RIPE community, the RIPE NCC recognizes that those broader questions did not accurately reflect the established distribution of responsibilities. This statement therefore clarifies and supersedes the relevant parts of SG2-C-0196. For the avoidance of doubt, the RIPE NCC supports the continued operation of Public ENUM under e164.arpa and is not proposing its closure. SG2-C-0196 no longer represents a request for Study Group 2 to determine the technical or architectural future of ENUM or e164.arpa. Any future consideration of a system-wide change would require coordination involving the IAB, the relevant IETF and ITU-T processes, the RIPE NCC and affected stakeholders. 2. Operational status and revised procedures The RIPE NCC has reviewed the 46 current delegations recorded in the RIPE Database. Of these, 23 showed no DNS issue at the top delegation level, 17 appeared non-operational and six showed partial DNS issues. These findings identify a registry-maintenance and data-accuracy issue. They do not provide a sufficient basis for a system-wide conclusion concerning Public ENUM or e164.arpa. The RIPE NCC therefore welcomes the revised Interim procedures for Geographic Country Codes (ENUM administration ad interim) contained in TD423 Rev.1/PLEN. The revised procedures provide an appropriate mechanism for addressing individual non-operational or expired temporary delegations while preserving functioning delegations and the ability of Member States to confirm, update, withdraw or subsequently restore their delegations. Responses to TSB Circular 123 may provide useful information concerning the status and intentions of individual national delegations. The RIPE NCC considers that such information should inform individual cases under the revised procedures, rather than a system-wide conclusion concerning Public ENUM or e164.arpa. 3. Request to Study Group 2 The RIPE NCC respectfully invites Study Group 2 to: - confirm that the revised procedures contained in TD423 Rev.1/PLEN will come into force at the September 2026 meeting and will provide the applicable mechanism for addressing individual non-operational or expired temporary delegations; and - continue coordination with the IAB, the RIPE NCC, the relevant IETF processes and affected stakeholders on any broader questions concerning the technical or long-term status of ENUM and e164.arpa. Once the revised procedures come into force, the RIPE NCC intends to apply them systematically and transparently, including by refreshing its technical assessment, engaging with relevant delegation operators where possible and submitting substantiated cases to TSB. The question of Registration Data Access Protocol support is separate from the continued operation of Public ENUM and will be considered through the appropriate technical and community processes. The RIPE NCC remains committed to working constructively with Study Group 2, TSB, the IAB, Member States, delegation operators and the RIPE community to maintain e164.arpa in a stable, accurate and technically sound manner.