Dennis Baron, March 30, 2006Page 0np142

ISN: ITAD Subscriber NumberSURA/ViDe Digital Video Conference

Dennis Baron

March 30, 2006

Dennis Baron, March 30, 2006Page 1np142

+1-734-352-7031

Deep bureaucratic hierarchy

Telco provider control

ben@internet2.edu

The world is flat (almost)

Be your own provider

Radically new devices / services

Old World / New World

Slide content courtesy of Ben Teitelbaum, Internet2

Dennis Baron, March 30, 2006Page 2np142

Why Phone NUMBERS?• Users should not be burdened with device addresses, when it’s

people they really care about

• Addresses should be mnemonic and empower enterprises to manage the identities of their users

sip:ben@internet2.edu

• It’s time to put E.164 phonenumbers behind us!

• A.G. Bell did not say:

“+1-734-352-7031, come here. I need you!”

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• Grow SIP reachability at existing email addresses

• Leverage existing directories and PBXs

SIPProxyDNS

SIP-PBXGateway PBX

INVITE (sip:bob@bigu.edu)

INVITE(sip:12345@gw.bigu.edu)

DNS SRV query sip.udp.bigu.edu

telephoneNumberwhere mail=”bob”

PRI / CASbigu.edu

CampusDirectory

SIP User Agent

Bob's Phone

Basics

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Deployments

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Cell Phones

IP Desk Phones Legacy Desk

Phones

PSTN

Old World*

Emerging New World

Solution:numeric aliases* Transitional period during which we have to

support these devices will last a long time!

How to SIP from a 12-key phone?

Slide content courtesy of Ben Teitelbaum, Internet2

Dennis Baron, March 30, 2006Page 6np142

• 4257*260

• ITADs–Defined by Telephony Routing over IP (TRIP) [RFC3219]

–Globally unique –Lots of them (256 through 232-1)–IANA is already set up to allocate

• ISN resolution works just like ENUM

locallyassigned

IP Telephony Administrative Domain (ITAD)

ITAD Subscriber Numbers (ISN)

Slide content courtesy of Ben Teitelbaum, Internet2

Dennis Baron, March 30, 2006Page 7np142

• Take an E.164 number

• Convert it to FQDN

• Query DNS for NAPTRs

• Apply resulting regexs to get list of URIs:

ENUM in a Nutshell

+1-734-913-4257

7.5.2.4.3.1.9.4.3.7.1.e164.arpa.

sip:bdr@internet2.edumailto:bdr@internet2.edusip:bobr_621@att.sbc.com

e164.arpa.

1.e164.arpa.

4.3.7.1e164.arpa. x.x.x.1.e164.arpa.

Slide content courtesy of Ben Teitelbaum, Internet2

Dennis Baron, March 30, 2006Page 8np142

• Take an ISN

• Convert it to FQDN

• Query DNS for NAPTRs

• Apply resulting regexs to get list of URIs:

ISN in a Nutshell

4257*260

7.5.2.4.260.freenum.org.

freenum.org.

260.freenum.org.

sip:bdr@internet2.edumailto:bdr@internet2.edusip:bobr_621@att.sbc.com

Note: We are working to ensure that the ISN root zone will be administered on behalf of the ISN user community by a neutral, non-profit organization. Following the trial, the root may or may not be “freenum.org”.

Slide content courtesy of Ben Teitelbaum, Internet2

Dennis Baron, March 30, 2006Page 9np142

Academic– Internet2– Hofstra University– UCLA– MIT– Stanford– University of Alaska Fairbanks– University of California, Berkeley– Florida State University– University of Manitoba– University of Oregon– Royal Institute of Technology– NE Worcestershire College– Trent University– University of North Carolina– University of Texas, Austin– Columbia University– UCSD– Taiwan Academic Network

Corporate Enterprises– Sterling National Bank– Apple Computer VoIP Service Providers

– Free World Dialup– Stealth Communications– SIPcall.com– RCN Corporation– VoIPteq– SIP Broker

Other– BizFu (web hosting)– Manitoba New Democratic Party– Packet Clearing House– +36 others

VoIP Solution Providers– Tello– Iotum– Digium

Government– State of Oregon

Slide content courtesy of Ben Teitelbaum, Internet2

Assigned ITADs (as of 3/15/06)

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• Trial just starting up– Supported by Internet2, Packet Clearing House,

MIT, Tello

• ISN Cookbook Published– Recipes for SER and Asterisk

• 81 ITADs assigned so far

Slide content courtesy of Ben Teitelbaum, Internet2

ISN Status

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1. Request an ITAD from IANA– Simple piece of email– Approximate two week turnaround

2. Publish your ITAD/ISN information in DNS– Option1: Put full NAPTR in root zone

*.xxx.freenum.org IN NAPTR 100 10 "u" "E2U+sip”"!̂\\+*([̂\\*]*)!sip:\\1@sip.big.edu!" .

– Option2: Have root zone delegate to your own nameservers3. Enable inbound ISN calling4. Enable outbound ISN calling

– Option1: Native ISN lookup– Option2: Using Tello SIP redirector– Option3: Using Tello private ENUM

Slide content courtesy of Ben Teitelbaum, Internet2

ISN in Four Easy Steps

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Email addressPhone numbersHuh?Familiarity

One spacePublic ENUM + multiple private ENUMs

One spaceFragmentation

With domain owner’s cooperation

Varies by country???

With domain owner’s cooperation

Portability

local@domainHierarchical / geographical

local*domainAddress Structure

ICANN, TLD registrars ITU, national government, …

IANADelegating Authority

ben@internet2.edu+1-734-352-70317031*260Example

SIP AORENUMISN

ISN vs. ENUM vs. SIP AOR

Slide content courtesy of Ben Teitelbaum, Internet2

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For More Information• ISN Cookbook, FAQ, and other info

– http://freenum.org/• Further Questions?

– Dennis Baron

• dbaron@mit.edu 21232*270– Ben Teitelbaum

• ben@internet2.edu 7031*260– John Todd

• jtodd@tello.com 2405*259

Slide content courtesy of Ben Teitelbaum, Internet2

Dennis Baron, March 30, 2006Page 14np142

Questions?

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