ENUM - The UK experience so far Tony Holmes BT Chairman of UK ENUM Group NICC Open Forum 2003
Mar 29, 2015
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
Smtp:[email protected]
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:[email protected]
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: [email protected]