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http://freenum.org/ . ISN: Free Numbers Fast. Dennis Baron, MIT Ben Teitelbaum, Internet2 John Todd, Loligo September 13 th , 2006 Fall VON, Boston, MA. …. …. PSTN. foo.edu. …. …. foo.edu. Internet. …. …. foo.edu. VoIP Service Provider. …. …. VoIP brought to you by…. foo.edu.

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ISN: Free Numbers Fast

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http://freenum.org/

ISN: Free Numbers Fast

Dennis Baron, MITBen Teitelbaum, Internet2John Todd, Loligo

September 13th, 2006Fall VON, Boston, MA


PSTN

foo.edu


foo.edu

Internet


foo.edu

VoIP ServiceProvider


VoIP brought to you by…

foo.edu


RTC brought to you by…

foo.edu


Old World / New World

Radically new devices / services

+1-734-352-7031

ben@internet2.edu

Deep bureaucratic hierarchy

The world is flat (almost)

Telco provider control

Be your own provider


SIP.edu

  • Email address as RTC handle

  • 250k .edu users

sip:dbaron@mit.edu


Unfortunately, it’s hard to enteralphanumeric addresses on this:


ISN Numbers…

21232*270

Domain-local(you allocate)

ITAD(IANA allocates)[RFC3219]


ITAD Subscriber Numbers

  • 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


Corporate Enterprises

  • Sterling National Bank

  • Apple Computer

ISN Trial Participation

  • 67 domains from 14 countries

Academic

  • Internet2

  • Hofstra University

  • UCLA

  • MIT

  • Stanford

  • University of Alaska Fairbanks

  • University of California, Berkeley

  • Florida State University

  • University of Manitoba (Canada)

  • University of Oregon

  • Royal Institute of Technology (Sweden)

  • NE Worcestershire College (England)

  • Trent University (Canada)

  • University of North Carolina

  • University of Texas, Austin

  • Columbia University

  • UCSD

  • Taiwan Academic Network

ITAD Assignments

  • 153 domains from 17 countries

VoIP Solution Providers

  • Tello

  • Iotum

  • Digium

  • Nokia

VoIP Service Providers

  • Free World Dialup

  • Stealth Communications

  • SIPcall.com

  • RCN Corporation

  • VoIPteq

  • SIP Broker

  • TellMe

  • PhoneGnome

Others

  • BizFu

  • Manitoba New Democratic Party

  • Packet Clearing House

Government

  • State of Oregon


Costs

  • ITAD Subscription: Free

  • License restrictions: None

  • Monthly recurring: None

  • Tech time: Small

  • User instruction: Medium


Benefits1/2

  • Free VoIP calling (expected zero-cost)

  • Future-proof numbering

  • Does not require change of equipment

  • Easy user memorization

  • Unique format makes routing and CDRs obvious


Benefits2/2

  • Incremental deployment of dialing plan

  • Even works with most SIP-only iPBX systems

  • Does not require VPNs, Switch fabrics, or contracts

  • No question of "ownership" of number space

  • No contradictory routes possible

  • Low technology hurdles to jump (standards-based!)


ISN vs ENUM vs SIP AOR


sip:bdr@internet2.edu

mailto:bdr@internet2.edu

sip:bobr_621@att.sbc.com

ENUM in a Nutshell

  • Take an E.164 number

  • Convert it to FQDN

  • Query DNS for NAPTRs

  • Apply resulting regexs to get list of URIs:

+1-734-913-4257

7.5.2.4.3.1.9.4.3.7.1.e164.arpa.

e164.arpa.

1.e164.arpa.

4.3.7.1e164.arpa.

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


sip:bdr@internet2.edu

mailto:bdr@internet2.edu

sip:bobr_621@att.sbc.com

ISN in a Nutshell

  • Take an ISN

  • Convert it to FQDN

  • Query DNS for NAPTRs

  • Apply resulting regexs to get list of URIs:

4257*260

7.5.2.4.260.freenum.org.

freenum.org.

260.freenum.org.

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”.


3 Easy Steps

  • Request an ITAD from IANA

  • 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 nameservers

  • Enable inbound / outbound ISN calling

    • Recipes for SER and Asterisk available


Asterisk Implementation

  • Outbound dialplan (one line!):Exten => _012.,1,Dial(SIP/${ENUMLOOKUP(${EXTEN},sip,i,freenum.org)})

  • Inbound:

    • No changes if your system supports inbound SIP extension calls


SER Implementation1/2

  • Inbound:

    • No changes if your system supports inbound SIP extension calls

    • Otherwise, can alias ISNs to URIs and resolve (see ISN Cookbook for example)


SER Implementation2/2

  • Outbound:route[3] { # Assert that uri is in proper format if (! (uri =~"^sip:[0-9]+\*[0-9]+@")) { xlog("L_CRIT", "%Tf: route[3] called with improper ISN\n"); break; }; if (!exec_dset("/usr/local/bin/isn-resolv.pl")) { sl_send_reply("404", "Not Found"); break; } else { xlog("L_INFO", "%Tf: Routing outbound ISN Call %ru(From [%fu], To [%tu])\n"); # Relay the message if (!t_relay()) { sl_reply_error();}; };} # end of ISN route block


“Dumb” iPBX Implementation

  • Pseudocode using public helpers:

    if $DIALEDNUMBER starts with "012" thenstrip off "012" from $DIALEDNUMBERsend SIP INVITE to $DIALEDNUMBER@freenum.orgelse dial-as-normal


MIT Deployment

  • Motivation

    • Evolution of our SIP infrastructure

    • Advancing support of early technology adopters

    • While maintaining interoperability with legacy technologies

    • Support for innovation on the “experimental campus”

    • Broaden our federation options

    • But still encourage the migration to full URI support!


MIT Deployment

  • Use Cases

    • Student can be called in her dorm room from friends and family using non-MIT VoIP services that use SIP analog terminal adapters

    • MIT press editor can collaborate with authors using his traditional PBX ISDN phone

    • MIT researchers can reach experimental voice recognition servers at a remote research lab from any campus phone


MIT Deployment

  • Issues

    • Easy to implement “native” ISN dialing on our SER based SIP proxies (but we haven’t done this yet)

    • Legacy PBX (Lucent 5ESS) couldn’t seem to cope with the “*”

    • Implemented Asterisk server to collect digits and route ISN calls


DNS lookup for 262

freenum.org

FWD phone rings

MIT SIP Proxy Servers

Campus Network

Internet

MIT Asterisk Server

SIP/PRI

Gateway

MIT PBX

Server prompts for number:

User dials 248911*

Server prompts for domain:

User dials 262#

MIT PBX user dials *0

MIT Deployment


Self-Demo

  • Call: +1-712-432-7935

  • Listen to the IVR

  • Enter an ISN

    • 87225*270- MIT Shuttle Track

    • 2425*259- Tello “success” message

    • 1234*256- Recorded monkeys, echo test


For More Information

  • ISN Cookbook, FAQ, and other info

    • http://freenum.org/

  • Contact us:

    • Ben Teitelbaum

      • ben@internet2.edu | 7031*260

    • John Todd

      • jtodd@tello.com | 2203*256

    • Dennis Baron

      • dbaron@mit.edu | 21232*270

  • Q&A right now


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