Document IPW-4 1

IP and Telecoms Interworking WorkshopIP and Telecoms Interworking WorkshopNNumbering, Naming Addressing and Routingumbering, Naming Addressing and Routing

IETF EMUM WG ProposalIETF EMUM WG Proposal

International Telecommunication Union

Telecommuniations Standardization Bureau

Geneva January 2000

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Presented ByPresented By

Representing IETFRichard Shockey

8045 Big Bend Boulevard, Suite 110Saint Louis, Missouri 63119 USA(314) 918.9020 Voice(314) 918.9015 Fax

E.Mail/IFAX rshockey@ix.netcom.com

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Problem StatementProblem Statement

How do you link the resources of the GSTN with the resources of the Internet?

How do you find a resource on the Internet if you only have a telephone number [E.164]?

How do you make this simple, easy to use without “reinventing the wheel”?

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Solution Proposal – ENUM WGSolution Proposal – ENUM WG

Put Telephone Numbers into the Global Domain Name System [DNS]

Use proposed NAPTR and SRV Resource Records [RR] to find :• IP Address• E-Mail addresses• SIP / H.323 servers• LDAP directories

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Why DNS?Why DNS?

Its there ..• It works .. its global .. it scales .. its

fast .. its open.

Why not something else?• X.500 ?• It was the judgment of the IESG to explore

the DNS option first.

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What ENUM is NOT…What ENUM is NOT…

Actual Routing of Phone calls within the terminating application protocol ..what ever that may be.

It is not a “white pages directory service”

Does not list “capabilities” of endpoints – IETF RESCAP WG

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““Out of Scope” for ENUMOut of Scope” for ENUM

Provisioning “e164.int”PropagationAdministrationService LogicCarrier Accounting - ReconciliationAnything to do with “policy”

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How does ENUM Work?How does ENUM Work?

Take a fully qualified E.164 number and create a DNS entry in a highly defined and structured domain.

The search for resources associated with 1 314 918-9020 becomes a look up to : 0.2.0.9.8.1.9.4.1.3.1.e164.int

Each digit becomes a definable and distributed “zone” in DNS terms

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How does ENUM Work?How does ENUM Work?

Response to query for 2.8.0.4.6.2.6.5.8.6.4.e164.int

In this response the prefered contact method is SIP ord pr fl service re replacement

IN NAPTR 10 10 "a" "sip+N2R" "" "sip:paf@swip.net”.

IN NAPTR 102 10 "s" "potscall+N2R" "" _potscall._tcp.paf.swip.net.

IN NAPTR 102 10 "a" "smtp+N2R" "" "mailto:paf@swip.net".

In this response the prefered contact method is H.323IN NAPTR 10 10 "s" "sip+N2R" "" “h323gw.tele3.se.

IN NAPTR 102 10 "s" "potscall+N2R" "" _potscall._tcp.paf.swip.net.

IN NAPTR 102 10 "a" "smtp+N2R" "" "mailto:paf@swip.net".

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ENUM in VoIP GatewaysENUM in VoIP Gateways

ENUM allows gateways to find each other.

ENUM is not for routing calls where than one gateway can handle the call. • IPTEL WG – [TRIP] Telephony Routing

Information Protocol ( proposed )

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ENUM in Universal MessagingENUM in Universal Messaging

EMA-IETF Voice Profile for Internet Mail [VPIM]

ENUM enables carrier and enterprise Voice Mail systems to interoperate and exchange messages

Retrieve voice mail from anywhere in the world with a local call

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ENUM in FaxENUM in Fax

Fax is not “dead.”• Fax is a essential global communications

service.• Fax number to E-Mail box [IETF RFC

2305-ITU T.37]• Fax number to ITU-T.38 servers• Fax number to Internet Print Protocol

servers

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ENUM in Local Number PortabilityENUM in Local Number Portability

ENUM could be used for Local Number Portability by carriers.

SCP servers could query DNS for available records.

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ConclusionsConclusions

““Standards are wonderful…that’s Standards are wonderful…that’s why we have so many of them.”why we have so many of them.”

Dr. Herman R. Silbiger ITU SG8/Q4 RapporteurDr. Herman R. Silbiger ITU SG8/Q4 Rapporteur

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9. 9. Political Political < < You are hereYou are here8. Financial8. Financial7. Application7. Application6. Presentation6. Presentation5. Session5. Session4. Transport4. Transport3. Network3. Network2. Link2. Link1. Physical1. Physical

The Real OSI ModelThe Real OSI Model

Apologies to University of Colorado Apologies to University of Colorado Engineering Scholarship fundEngineering Scholarship fund