1 ietf- enum itu-t workshop for international regulators 17 january 2001 – itu hq geneva richard...
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IETF- ENUM
ITU-T Workshop for International Regulators17 January 2001 – ITU HQ Geneva
Richard Shockey
IETF ENUM Work Group Co-Chair
Senior Technical Industry Liaison
NeuStar, Inc.
1120 Vermont Avenue N.W.
Washington DC, 20005
[email protected] 202.533.2811
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Introduction – Why are we here?Introduction – Why are we here?
From a delayed contribution to SG2 by France :
– “ ENUM protocol is defined by RFC 2926, aiming at translating the numbers stemming form the ITU-T E.164 Recommendation into Internet Domain Names; ENUM is an opportunity for developing the information society.”
– “As a matter of fact, ENUM allows to use a traditional telephone number in the context of different communications media, in particular those rising from the development of IP networks (e-mail, VoIP, …) and therefore, could facilitate the penetration of new applications into the mass market easily ( this market is accustomed to E.164 numbers).”
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Introduction – Why are we here?Introduction – Why are we here?
From a delayed contribution to SG2 by France:
– “This is a key opportunity for Internet communications service providers, who could tailor their services to be accessible by means of E.164 numbers, widely in use throughout the world ( much more than Internet domain names or e-mail addresses ).”
– “Therefore, ENUM is a chance for the “Internet world” to enter the E.164 naming system, which has the advantages of being stable, world-wide used and well-digested by end users.”
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OverviewOverview
ENUM is part of Convergence– ENUM is part of series of technical initiatives underway
in both the IETF and ITU to develop Internet Telephony Standards.
Call Setup – H.323 – SIP
Quality of Service – DIFFSERV – INTSERV – MPLS
PSTN – IP Interworking H.248/MEGACO
FAX – T.37 T.38 – RFC 2503
Mobile – 3GPP related
ENUM is about new service creation
But we must address naming and numbering issues
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Problem StatementProblem Statement
How do you find services on the Internet if you only have a telephone number [E.164]?
How can we enable new IP services while creating new competitive markets and protect consumer choice,etc?
How can consumers and carriers have equal access to these new opportunities?
How do we create a trusted TN based resource for information about those services?
How do you make this simple, easy to use, without “reinventing the wheel”?
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Solution ENUM / DNS Directory ServiceSolution ENUM / DNS Directory Service
• Put telephone numbers into the global Domain Name System [DNS]
ENUM WG formed and operates within in the Internet Engineering Task Force
– Core protocol work completed - RFC2916
RFC2916 defines the use of DNS resource records to find optional :
– E-mail addresses
– Voice over IP SIP / H.323 servers
– Voice Mail servers
– Fax Machines
– New and yet undefined services !
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Why DNS?Why DNS?
It’s there...– It works... It’s global... It scales... It’s
fast... It’s open.
ENUM enabled DNS creates a low cost, shared Service Control Point like infrastructure for IP services
Goal – Telephone Number IN …. URL out
Key to TN related services offered by providers over IP
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Why E.164 Telephone Numbers?Why E.164 Telephone Numbers?
Familiar to consumers
TN’s are linguistically neutral– Internationally Understood
E.164 Plan is “Authoritative” – Trusted to produce consistency across the
PSTN.
A Billion devices or so do not have QUERTY Keyboards….
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How Does ENUM Work?How Does ENUM Work?
Take a fully qualified E.164 telephone number and create a DNS entry in a single highly defined and structured domain.
The search for resources on the internet associated with + 1 202-533-2811 becomes a DNS look up to: 1.1.8.2.3.3.5.2.0.2.1.e164.arpa
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RFC 2916RFC 2916
ENUM is not about putting telephone numbers into any domain..it specifically about putting E.164 numbers into e164.arpa ( a subtle distinction )
From RFC2916: – “The domain "e164.arpa" is being populated in order to provide the
infrastructure in DNS for storage of E.164 numbers.”
– “This memo requests that the IANA delegate the E164.ARPA domain following instructions to be provided by the IAB. Names within this zone are to be delegated to parties according to the ITU recommendation E.164. The names allocated should be hierarchic in accordance with ITU Recommendation E.164, and the codes should assigned in accordance with that Recommendation.”
Private dialing plans can be accommodated in any domain.
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Why e164.arpa ?Why e164.arpa ?
The e164.arpa domain was selected by the Internet Architecture Board specifically for this purpose with the concurrence of the ITU
.ARPA is designated by the IAB for Internet Infrastructure issues– in-addr.arpa (reverse IP address look up)
.ARPA is a well managed, stable and secure operational environment under IAB supervision
Single domain structure under e164.arpa becomes the authoritative “root” for E.164 telephone numbers
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Simple ENUM Flow ChartSimple ENUM Flow Chart
SIP Proxies
ENUM Global Directory (DNS)
Equates 1(202) 533-2811 to sip:[email protected] to enable Voice over IP using SIP
Proxy Queries DNS for SIP Address based on TN
Internet
DNS
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What ENUM is not….What ENUM is not….
ENUM is not about carrier selection (selection of carrier within a given service type)
ENUM is not about telecom bypass– An alternative to circuit switched technology
ENUM does not change the Numbering Plan– ENUM does not change ITU-E.164– ENUM does not change existing telephony numbering or
its assignments in anyway – ENUM does not exhaust national number plans
May conserve numbering resources
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Privacy ConsiderationsPrivacy Considerations
We believe that RFC 2916 is consistent with current EC policy on Privacy and Data Protection
There is no requirement for WHOIS
ENUM is a Opt-IN system
ENUM does not expose personal data or personal preferences for call processing– ENUM is essentially routing data – a
shared Service Control Point
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ApplicationsApplications
Internet
ENUM
Directory
TelephonyNetworks
Enabled Enabled ApplicationsApplications
• Voice over IP
• Unified Messaging
• Instant Messaging
• IP Fax
• Personal Web Pages
E.164 E.164 NumbersNumbers
• 10 Digit10 Digit
• 800800
• InternationalInternational
PrivatePrivate
NetworksNetworks
Internet Domain Internet Domain Name AddressesName Addresses
DNSDNS
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ITU – IAB / IETF AgreementsITU – IAB / IETF Agreements
Liaison Statement issued by Study Group 2 now officially RFC 3026
IETF – ITU Agree on delegation model that completely follows the ITU-T E.164 plan for inclusion into e164.arpa
Operational Responsibility is at the IAB, while Administrative Management is at ITU.
- e164.arpa geographic zones controlled by appropriate Member State.
– ITU will insure that Member States have authorized the inclusion of their Country Code in e164.arpa
– ITU to coordinate with RIPE NCC as the Root Administrator– IETF - ITU jointly work together in moving forward
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Member State IssuesMember State Issues
How are the National Delegation Servers for each CC to be managed?
– From RFC 2916: “Holders of E.164 numbers which want to be listed in DNS should contact the appropriate zone administrator in order to be listed, by examining the SOA resource record associated with the zone, just like in normal DNS operations.”
– This means Member States are the ENUM Zone Administrators for their CC’s
Who manages these servers is a Member State issue.
What is the process and criterion used for ENUM Administrator selection?
What capabilities should ENUM Administrators have?– Financial / Technicial
What performance requirements should ENUM Administrators have?
What Regulatory Rules must they operate under?
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Next Steps…Next Steps…
ENUM Technical – Testing and TrialsVendors put ENUM capable DNS Resolver into Internet Telephony Products
Create ENUM / DNS Operational Metrics– Security – Redundancy
Administrative – Member State DefinedEducational Process within Communities of Interest
ENUM Operations– How do you authenticate the identity of the subscriber
for ENUM services ?– Who are ENUM Registrars and what are they
responsible for?– How do you validate ENUM data for potential users
( Add - Modify – Delete ) NAPTR list of services and preferences)
– How is the data provisioned to the CC zone NS
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Next Steps…Next Steps…
– What happens when a TN is disconnected? How and when will ENUM RR be deleted?
– What is the role of the incumbent PSTN carrier?– How is competition promoted in the process?
Existing Policy models within Member States offer guidance to :
Promote Consistency with E.164 Number Plan and Number Portability requirements
Prevent Number Slamming
Prevent Number Hijacking
Protect Consumers Interest
Protect Consumer Privacy
Equal Access to RR’s by all qualified carriers and service providers
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ENUM ResourcesENUM Resources
ENUM Charter
http://www.ietf.org/html.charters/enum-charter.html
ENUM Core Protocol
ftp://ftp.isi.edu/in-notes/rfc2916.txt
ENUM WG Requirements
http://www.ietf.org/internet-drafts/draft-ietf-enum-rqmts-01.txt
ENUM Call Flows
http://www.ietf.org/internet-drafts/draft-lind-enum-callflows-01.txt
ENUM Operations Issues
http://www.ietf.org/internet-drafts/draft-ietf-enum-operation-01.txt
ENUM Administration in the United Stateshttp://www.ietf.org/internet-drafts/draft-pfautz-yu-enum-adm-00.txt
Voice Profile for Internet Mail
ftp://ftp.isi.edu/in-notes/rfc2421.txt
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ENUM ResourcesENUM Resources
IETF-ITU Liaison Statement
ftp://ftp.isi.edu/in-notes/rfc3026.txt
NAPTR Resource Records
ftp://ftp.isi.edu/in-notes/rfc2915.txt
A DDDS Database Using The Domain Name System
http://www.ietf.org/internet-drafts/ draft-ietf-urn-dns-ddds-database-01.txt
Dynamic Delegation Discovery System (DDDS)
http://www.ietf.org/internet-drafts/ draft-ietf-urn-ddds-02.txt
URI Resolution using the Dynamic Delegation Discovery System
http://www.ietf.org/internet-drafts/ draft-ietf-urn-uri-res-ddds-01.txt
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Web ResourcesWeb Resources
International Telecommunications Union– http://www.itu.int/infocom/enum/
CyberTelecom– http://www.cybertelecom.org/teleph.htm