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

ENUM - The UK experience so farTony Holmes BTChairman 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?

• How can users define their preferences for incoming communications?

Today we have too many addresses

Tel:+44 1732 475517

Sip:holmes@xyz.com

Smtp:arh@xyz.com

Fax: +44 1689 850104

+44 7710 005459

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

ENUM Number Resolution

DNS

+44 1732 475517 7.1.5.5.7.4.2.3.7.1.4.4.e164.arpa

Page:8001112223334445Page

http://enumjunkie.holmes.comHTTP

Tel:+1732 475517TEL

Smtp:arh@xyz.comSMTP

Sip:holmes@xyz.comSIP

Service AddressProtocol

ENUM converts the E.164 telephone number into a set of service addresses.

ClientSoftware

Facilitates order & preference

Typical Applications

ENUM

Directory

Internet

Cct switched (PSTN)

Networks

Typical Typical ApplicationsApplications

ININ

E.164 E.164

(Telephone) (Telephone) NumbersNumbers

InternetInternet DomainDomain NameName AddressesAddresses

DNSDNS

Out

url

Personal Web Pages

IP Fax

Unified Messaging

Voice over IP

Instant Messaging

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

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’

RIPE NCC

e164.arpa

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…..4.2.3.7.1.4.4.e164.arpa

Tier 2 Entity (T2E)Registry x

Registry yRegistry z

end user

Single T1

Multiple T2 Registries Registrars

The Model

TIER 1 Registryholds 4.4.e164.arpa

AuthenticationAgency

ENUMRegistrar

DNS Providerholds NAPTR

DNS Providerholds NAPTR

ENUMRegistrar

AuthenticationAgency

ENUMRegistrar

Possible groupings of players in ENUM into business entities

ENUM Model for the UK

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

• 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

Objectives of UK ENUM Trial

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

Some major issues……. and proposed solutions

AuthenticationThe process of Identification and validation

Authentication Requirements:• TrustThe registrant must;- have the right to register the number - be who they say they areOnly authorised numbers assignees subscribe to, change or cancel their ENUM registrations

• OpennessNo artificial barriers to registration (cost, timescales, restrictive practices etc)• Value Cost must be set to a reasonable level• LiabilityRegistrant must inform Registrar of events that change the nature of the subscription e.g cease of number. porting

AuthenticationProposed 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

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

Control & Administration of Numbers and Names for ENUMNumbers• 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

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!

Current proposed approach towards ENUM policy formation in the UK

UK ENUM policy formation

Stakeholder representation

UKEMGIndependent Group (inc DTI)

Policy Formation

UKEPAC

Policy ratification

UKEPG

Open Pubic forum

Comment

(Policy Advisory Council)

Management Group

Proposed make up of the Management Group and the Policy

Advisory CommitteeUK ENUM MANAGEMENT GROUP

UK ENUM POLICY ADVISORY COMMITTEE

Tier 1 Registry

Tier 2 DNS Providers

Tier 2 Registrars

Authentication Agencies

Application Providers

Users

DTI (Observers)

Others?

Representatives from Independent Organisations

DTI (Observers)

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

UK ENUM Policy development

Policy Development

Input from other interested parties

Annual Public Forum

UKEPAC

UKEMG

identifydevelop

testimplement

commentratify

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

A single Tier 1 for the UK!

DTI has stated ‘they will not assume this responsibility’

• Selection of a single Tier 1 Registry means- somebody must assume overall responsibility- somebody has to make the choice

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

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

Thank You

Tony Holmese-mail: tony.ar.holmes@bt.com