ENUM - The UK experience so far

1. ENUM - The UK experience so far Tony Holmes BT Chairman of UK ENUM Group NICC Open Forum 2003

2. ENUM - the starting point • Problem Statement • How do network elements (gateways, SIP servers etc) find services on the Internet if you only have a telephone (E.164) number? • How can users define their preferences for incoming communications?

3. Today we have too many addresses Tel:+44 1732 475517 Sip:holmes@xyz.com Fax: +44 1689 850104 +44 7710 005459 Smtp:arh@xyz.com

4. The ENUM concept . Use telephone numbers as part of a domain name in the global domain name system (the DNS) • Take a phone number +44 1732 475517 • Turn it into a domain name 7.1.5.5.7.4.2.3.7.1.4.4.e164.arpa DNS

5. Protocol Service Address SIP Sip:holmes@xyz.com SMTP Smtp:arh@xyz.com TEL Tel:+1732 475517 HTTP http://enumjunkie.holmes.com Page Page:8001112223334445 ENUM Number Resolution DNS +44 1732 475517 7.1.5.5.7.4.2.3.7.1.4.4.e164.arpa ClientSoftware ENUM converts the E.164 telephone number into a set of service addresses. Facilitates order & preference

6. Typical Applications Typical Applications Out url ENUM Directory Instant Messaging Voice over IP DNS InternetDomain NameAddresses Internet Unified Messaging IN E.164 (Telephone) Numbers IP Fax Cct switched (PSTN) Networks Personal Web Pages

7. New business or old business in new packaging? • It enables the use of traditional telephone numbers in the context of different communications media, particularly those rising from the development of IP networks (e-mail, VoIP, etc) • ENUM will facilitate the penetration of new applications into the mass market • ENUM is about new service creation

8. The UK ENUM Group • UK ENUM GROUP (UKEG) formed September 2001 • - Tasked with the goal of identifying possible implementation options for the UK and recommending preferred infrastructure. • - Also to identify and resolve related issues • UKEG Preliminary Report - April 2002 • http://www.dti.gov.uk/cii/regulatory/enum/egp_report.shtml • Recognised • - user ‘opt in’ approach as a critical requirement • - need for good authentication procedures • - major issues to be resolved on privacy • - need for compliance with EU/UK consumer protection & data privacy laws • Proposed: • - Single Tier 1 Registry for the UK (+44) • - competition at the Tier 2 level • - creation of new industry led ‘Policy Oversight Committee’

9. Registrar C Registrar B Tier 2 ( Registrar A) end user The Model RIPE NCC e164.arpa Tier 1 Entity (T1E) 4.4.e164.arpa Single T1 Registry z Registry y Multiple T2 Registries Registrars Registry x Tier 2 Entity (T2E) …..4.2.3.7.1.4.4.e164.arpa sip: eu @ foo.tld mailto: eu @ bar.tld Assignment Entity (TSP/NRA/third party)

10. ENUM Model for the UK TIER 1 Registry holds 4.4.e164.arpa Authentication Agency DNS Provider holds NAPTR DNS Provider holds NAPTR Authentication Agency ENUM Registrar ENUM Registrar ENUM Registrar Possible groupings of players in ENUM into business entities

11. The UK ENUM Trial • UKEG held Trial Seminar Sept 2002 • - Trial pack issued setting out ‘roles’ • - ‘Expressions of Interest’ requested • - Applicants requested to sign MoU setting out basic rules • 1st meeting of Trial Group (UKETG) held November 2002 • - all ‘roles’ filled • - 3 applicants for Tier 1 role • decision taken to share T1 for the trial • Work began in earnest January 2003

12. Objectives of UK ENUM Trial • Evaluate the pros and cons of implementing ENUM in the UK • Evaluate processes/interfaces/protocols for the interactions between the different parties • Determine technical and operational requirements for provisioning ENUM records • To assess DNS requirements/ implications in the provision of ENUM services • To determine security and verification requirements • To test from a technical and user perspective applications • To evaluate and refine the economic benefits and costs of supporting ENUM. • Results of the trial will be used by UKEG to determine the preferred implementation framework for provision of ENUM capabilities behind CC 44

13. Progress to date • UK ENUM Trial Group formed as sub group of UKEG • Delegation of +44 made to UKEG for Trial with backing from DTI • All required roles filled for trial • 3 applications from trial participants for Tier 1 Role • - decision taken to share role for the trial • All required Infrastructure in place • Test calls made • Much focus on Authentication role • UKEG Trial Group currently producing report on progress and agreements made so far

14. Some major issues……. and proposed solutions

15. Authentication The process of Identification and validation • Authentication Requirements: • Trust • The registrant must; • - have the right to register the number • - be who they say they are • Only authorised numbers assignees subscribe to, change or cancel their ENUM registrations • Openness • No artificial barriers to registration (cost, timescales, restrictive practices etc) • Value • Cost must be set to a reasonable level • Liability • Registrant must inform Registrar of events that change the nature of the subscription e.g cease of number. porting

16. Authentication • Proposed approach • Authentication Agency (AA) may choose market in which they operate e.g. Only DQ numbers, certain TSP numbers • TSP (Telephone Service Provider) participation preferred • - enables maximum level of trust • - provides interface to all accredited AAs • - Number Portability process may offer a way forward • (initial discussions with NP Industry Group) • other options include Carrier Pre-selection Service • Other possible ‘Trusted’ solution • PIN mailed to registered address • ‘Basic’ Authentication as a fallback • Applicant produces supporting documentation e.g. bill, bank statement with passport, driving licence

17. ENUM & the Internet naming environment • ENUM will use E164 numbers as part of a domain name +44 1732 475517 7.1.5.5.7.4.2.3.7.1.4.4.e164.arpa • How regulation impacts is dependent upon the Comm’s Bill • In the UK….numbers are regulated, domain names are not • This raises key issues for ENUM

18. Control & Administration of Numbers and Names for ENUM • Numbers • ITU responsible for administration at the top level • e.g. assignment of E.164 Country Codes • National resources administered by NRAs (OFCOM) • For ENUM ITU procedures ensure no ENUM CC delegations without agreement of the Administration • Rules for insertion of numbers in ENUM is a national issue • ETSI have specified guidelines for European ENUM implementations (ETSI TS 102 051: "ENUM Administration in Europe”) • Domain Names • Control of domain names in ENUM is a national issue • Implementation requires the UK to develop ENUM policy

19. ENUM Policy development in the UK • UKEG identified key requirements • ‘policy development has to be open, fair an transparent’ • Who should develop policy and on what basis ? • DTI has stated ‘they will not assume this responsibility’ • - who will make the rules? • - how will they be implemented? • - what powers will exist? • UKEG has considered the initial problems and identified a possible ways forward!

20. Current proposed approach towards ENUM policy formation in the UK

21. Proposed make up of the Management Group and the Policy Advisory Committee UK ENUMMANAGEMENT GROUP Representatives from Independent Organisations DTI (Observers) UK ENUM POLICY ADVISORY COMMITTEE Tier 1 Registry Authentication Agencies Tier 2 DNS Providers Application Providers Tier 2 Registrars Users DTI (Observers) Others?

22. Purpose of the Management Group • Facilitate an open, competitive environmenture • Ensure the required degree of transparency • Safeguard the integrity and rights of users • To meet the needs of the ENUM Players • Underpin commercial requirements through through the use of effective contractual arrangements where deemed necessary • Oversee and ensure compliance with all EU and UK regulatory requirements which impact the ENUM environment

23. UK ENUM Policy development UKEMG comment ratify identify develop test implement UKEPAC Policy Development Annual Public Forum Input from other interested parties

24. Additional work on UK ENUM Policy • Further work required on: • - legal standing /recognition of policy body • - relationship with existing UK ENUM Group • - development of detailed by-laws • - disclosure obligations • - timeframes and impact on commercial launch • Gaining the required participation in • - Management Group • - Policy Advisory Group

25. A single Tier 1 for the UK! • Selection of a single Tier 1 Registry means • - somebody must assume overall responsibility • - somebody has to make the choice DTI has stated ‘they will not assume this responsibility’

26. A single Tier 1 for the UK - the way forward • UKEG has: • recommended an ‘open competition for Tier 1 Registry’ • developed basic principles for registry operations covering • - operational and technical requirements • - business, financial, legal and other requirements • developed a criteria assessment document FUTURE STEPS • Invitation to tender • Independent evaluation of bids • Contractual arrangements between new ‘policy body’ and successful applicant

27. The Way Forward • Public consultation early 2004 • UKEG trial continuing to provide additional experience and identify and resolve issues • UKEG to initiate discussions with industry/other interested parties on policy aspects • Actions required following Consultation exercise

28. Thank You Tony Holmes e-mail: tony.ar.holmes@bt.com