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

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Enum the uk experience so far l.jpg

ENUM - The UK experience so far

Tony Holmes BT

Chairman of UK ENUM Group

NICC Open Forum 2003


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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?


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Today we have too many addresses

Tel:+44 1732 475517

Sip:[email protected]

Fax: +44 1689 850104

+44 7710 005459

Smtp:[email protected]


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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


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Protocol

Service Address

SIP

Sip:[email protected]

SMTP

Smtp:[email protected]

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


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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


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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


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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’


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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)


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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


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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


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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


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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


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Some major issues……. and proposed solutions


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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


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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


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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


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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


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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!



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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?


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Purpose of the Management Group Advisory Committee

  • 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


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UK ENUM Policy development Advisory Committee

UKEMG

comment

ratify

identify

develop

test

implement

UKEPAC

Policy Development

Annual Public Forum

Input from other interested parties


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Additional work on UK ENUM Policy Advisory Committee

  • 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


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A single Tier 1 for the UK! Advisory Committee

  • 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’


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A single Tier 1 for the UK Advisory Committee - 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


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The Way Forward Advisory Committee

  • 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


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Thank You Advisory Committee

Tony Holmes

e-mail: [email protected]


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