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!