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ENUM 353 Conor Daly, IENUM HEAnet conference Kilkenny, Nov 2007 “…….. the world connected by telephone numbers will be integrated with the world connected to IP addresses” “This linking is inevitable. ENUM is the most likely means to do it………..” - John Horrocks, Number Portability expert Agenda • What is ENUM? • How does ENUM work? • ENUM – use cases – Lookup service – VoIP – PBX integration • ENUM in Ireland IENUM Limited • Competitive international tender • 70/30 joint venture IEDR & IPA • IEDR and IPA are not-for-profit ccTLD’s • Advised on Technical matters by TAG, which currently includes :- • IENUM corporate structure • Richard Stasny • John Horrocks Advised on Policy by PAB What is ENUM? • Based on Domain Name System (DNS) – Same as internet domain names • DNS service: 1. 2. 3. 4. • User types in domain (key) into browser etc DNS lookup performed Lookup yields onward routing information Information for mail delivery, website etc In ENUM – Telephone number is used as key What is ENUM? Query: +353 1 2365 400 ? ENUM Response: mailto:[email protected] http://www.enum.ie/ … Internet How does ENUM work? • tElephone NUmber Mapping • Electronic Numbering • Protocol defined by IETF (RFC3761) • ENUM is a means to map telephone numbers to internet addresses • Uses well established Domain Name System • IENUM Limited launched commercial Irish ENUM service in May 2007 How does ENUM work? • An ENUM lookup has two components 1. Telephone number conversion to domain : • +353-1-2365409 becomes :– 35312365409 – 3.5.3.1.2.3.6.5.4.0.9 – 9.0.4.5.6.3.2.1.3.5.3 • 9.0.4.5.6.3.2.1.3.5.3.e164.arpa This domain is then used as a key to lookup internet services/addresses 2. Query for NAPTR RR in DNS:• • • NAPTR format similar to MX record, order & preference fields NAPTR payload can contain SIP addr, email addr etc All done in software ENUM - Use cases Use cases: VoIP without ENUM dials +353 1 2365400 PSTN +353 1 2365400 +353 1 2345678 University ienum.ie A sip:[email protected] Sip:[email protected] Internet Worlds apart – Internet and PSTN Addressing formats differ +353 1 2365400 sip:[email protected] Use cases: VoIP with ENUM dials +353 1 2365400 PSTN +353 +353 1 1 2365400 2365400 +353 1 2345678 University ienum.ie A sip:[email protected] Sip:[email protected] Internet Query: +353 1 2365400 ENUM DNS Response: sip:[email protected] Use cases: PBX-Integration • Reuse of existing hardware & devices • No change in user experience • University of Vienna – http://www.at43.at/en/ sip:[email protected] VoIP / Internet PBX ENUM & VoIP PSTN +353 1 2365400 ENUM Summary • "ENUM brings your phone number to the internet“ • Associates internet address with phone numbers • Available to any internet connected device • International standard using existing DNS infrastructure – no new servers needed • Versatile – easy to introduce new applications • Tech-speak: An application of the DNS to refer from E.164 numbers to URIs, and make those references available via DNS resource records ENUM is • – – – • NOT a Voice over IP protocol like SIP or H.323 NOT a gateway service NOT a VoIP service provider ENUM is just one component in the convergence of the PSTN and the Internet. – – Everything moving to IP Enabling technology ENUM in Ireland Available in Ireland from 30th May from IENUM Limited:• 7th Country in the world • Tier 1 registry system (www.enum.ie) • Provisioning client toolkit available for registrars • Tier 2 registrar of last resort • web-based interface (www.my-enum.ie) to automate registration and account management • A showcase facility! • Validation Services • Opt-in service reflecting PAB data privacy policy • Authentication to prove “right to use” • Abuse facility for unauthorised use • Number block registration possible ENUM in Ireland ENUM in Ireland Summary • ENUM is a means to map telephone numbers to internet addresses • Main use case currently VoIP • ENUM services available since May • ENUM event – 28th Nov Further information • For further information please see: – IENUM Limited services • http://www.my-enum.ie • http://www.enum.ie – General ENUM and VoIP info: • http://www.voip-info.org/wiki/view/ENUM – IETF Standards: • • • • http://www.ietf.org/rfc/rfc2915.txt http://www.ietf.org/rfc/rfc3761.txt http://www.ietf.org/rfc/rfc4725.txt http://www.ietf.org/html.charters/enum-charter.html Thank You! Conor Daly IENUM Limited [email protected] +35312365409