1. ENUM The Status of UK Implementation Tony Holmes BTexact Technologies Numbering Addressing & Routeing Chairman UK ENUM Group ITU February 2002

2. © British Telecommunications plc 20012 DTI ENUM Group workshop held June 01 Purpose to understand issues and assess level of interest Outcome was to form a UK Industry group UKEG commenced work September 01 UKEG Industry wide but under the auspices of the DTI Status of ENUM in the UK

3. © British Telecommunications plc 20013 UK ENUM GROUP REMIT Industry led Group with broad participation Scope of work limited to implementation of RFC2916 Identification and resolution of issues Consider implementation options Agree preferred options Produce report for the DTI Identify interest in possible trial Review ongoing discussion of ITU & ETSI activities

4. © British Telecommunications plc 20014 Agreed that maximum choice is required for users to register for ENUM services Choice can be achieved by having competition at the Tier 2 Registry level Commercial justification for ENUM services should drive implementation Lots of interest in a trial - work proceeding Delegation of +44 requested from RIPE NCC Progress so far

5. © British Telecommunications plc 20015 RIPE NCC e164.arpa Single T1 + competitive T2 Registries + competitive T2 Registrars Tier 1 Entity (T1E) 4.4.e164.arpa Tier 2 ( Registrar A) Registrar B Registrar C Assignment Entity ( TSP /NRA/third party) sip: eu @ foo.tld mailto: eu @ bar.tld 1.2 ….. 4.4.e164.arpa Tier 2 Entity (T2E) Registry x Registry y Registry z end user

6. © British Telecommunications plc 20016 Thank you Tony Holmes BTexact Technologies e-mail: tony.ar.holmes@bt.com