ISN in a Nutshell 21st APAN Meeting Tokyo, Japan January 25, 2006 Ben Teitelbaum ben/ ben

ISN in a Nutshell21st APAN Meeting Tokyo, JapanJanuary 25, 2006

Ben Teitelbaumhttp://people.internet2.edu/~ben/

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What if SIP.edu Succeeded?

SIP.edu’s Big Goals• Better than POTS• Campus-enabled • Converged address

But, users won’t adopt advanced communications if the rest of the world can’t call them

The problem is not: “How to preserve E.164?”

rather, the problem is…

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How to SIP from 12-key phones?

Cell Phones

IP Desk Phones Legacy Desk

Phones

PSTN

Old World

Emerging New World

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Head Scratching in SIP.edu WG

IVR Gateway

Hash Registrar

Domain Redirect

ISN• Improvement on Domain Redirect• Inspired by INOC-DBA

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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

Internet Telephony Administrative Domain (ITAD)

ITAD Subscriber Numbers (ISN)

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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:[email protected]:[email protected]:[email protected]

e164.arpa.

1.e164.arpa.

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

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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:[email protected]:[email protected]:[email protected]

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”.

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Trial just starting• Supported by Internet2, Packet Clearing House, MIT, Tello

ISN Cookbook Published• Recipes for SER and Asterisk

Registered ITADs• Today

– Internet2 (260)– FreeWorld Dialup (262)– Hofstra University (264)

– UCLA (269) (accepting)

– MIT (270) (accepting)– State of Oregon (276)

ISN Status

• Coming Soon– Stanford (274) – U Alaska (277)– UC Berkeley (278)– Florida State U (280)– U Manitoba (281)– U Oregon (283)– +22 others

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ISN in Four Easy Steps

1. Request an ITAD from IANA• Simple piece of email• 2-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:\\[email protected]!" .

• Option2: Have root zone delegate to your own nameservers

3. Enable inbound ISN calling

4. Enable outbound ISN calling1. Option1: Native ISN lookup2. Option2: Using Tello SIP redirector3. Option3: Using Tello private ENUM

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More Information

ISN Cookbook• http://www.internet2.edu/sip.edu/isn/

Web Site• http://www.freenum.org/

Further Questions? Email us…• John Todd [email protected] • Ben Teitelbaum [email protected]• Dennis Baron [email protected]

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Thanks!