ISN: Free Numbers Fast Dennis Baron, MIT Ben Teitelbaum, Internet2 John Todd, Loligo September 13...

ISN: Free Numbers Fast

Dennis Baron, MITBen Teitelbaum, Internet2John Todd, Loligo

September 13th, 2006Fall VON, Boston, MA

http://freenum.org/

2“ISN Free Numbers Fast”, September 13th , Fall VON, Boston, MA

http://freenum.org/

ISN

PSTN

foo.edu

… …


http://freenum.org/

ISN

Internet

foo.edu

… …


http://freenum.org/

ISN

foo.edu

… …

VoIP ServiceProvider


http://freenum.org/

ISN

foo.edu

VoIP brought to you by…

… …


http://freenum.org/

ISN

…

foo.edu

RTC brought to you by…

…


http://freenum.org/

ISNOld World / New World

+1-734-352-7031 [email protected]

Deep bureaucratic hierarchy The world is flat (almost)

Telco provider control Be your own provider

Radically new devices / services


http://freenum.org/

ISNSIP.edu

sip:[email protected]

Email address as RTC handle250k .edu users


http://freenum.org/

ISNUnfortunately, it’s hard to enter

alphanumeric addresses on this:


http://freenum.org/

ISN

21232*270

Domain-local(you allocate)

ITAD(IANA allocates)

[RFC3219]

ISN Numbers…


http://freenum.org/

ISNITAD Subscriber NumbersDefined 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


http://freenum.org/

ISNAcademic

• 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

Corporate Enterprises• Sterling National Bank• Apple Computer

Others• BizFu• Manitoba New Democratic Party• Packet Clearing House

Government• State of Oregon

ISN Trial Participation• 67 domains from 14 countries

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


http://freenum.org/

ISNCostsITAD Subscription: Free

License restrictions: None

Monthly recurring: None

Tech time: Small

User instruction: Medium


http://freenum.org/

ISNBenefits1/2

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


http://freenum.org/

ISNBenefits2/2

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!)


http://freenum.org/

ISNISN vs ENUM vs SIP AORISN E.164 SIP AOR

Example 7031*260 +1-734-352-7031 [email protected]

Familiarity Unfamiliar Phone numbers Email address

Delegating Authority

IANA ITU, national government, …

ICANN, TLD registrars

Address Structure

local*domain Hierarchical / geographical

local@domain

Non-numeric characters

“*” only Ignored Yes

Portability With domain owner’s cooperation

Varies by country With domain owner’s cooperation

Fragmentation One space Public ENUM + multiple private ENUMs

One space


http://freenum.org/

ISN+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.

ENUM in a Nutshell

1. Take an E.164 number

2. Convert it to FQDN

3. Query DNS for NAPTRs

4. Apply resulting regexs

to get list of URIs:


http://freenum.org/

ISN4257*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”.

ISN in a Nutshell

1. Take an ISN

2. Convert it to FQDN

3. Query DNS for NAPTRs

4. Apply resulting regexs

to get list of URIs:


http://freenum.org/

ISN3 Easy Steps1. Request an ITAD from IANA

2. Publish your ITAD/ISN information in DNS1. Option1: Put full NAPTR in root zone

*.xxx.freenum.org IN NAPTR 100 10 "u" "E2U+sip” "!^\\+*([^\\*]*)!sip:\\[email protected]!" .

2. Option2: Have root zone delegate to your own nameservers

3. Enable inbound / outbound ISN calling1. Recipes for SER and Asterisk available


http://freenum.org/

ISNAsterisk 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


http://freenum.org/

ISNSER 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)


http://freenum.org/

ISNSER 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


http://freenum.org/

ISN“Dumb” iPBX ImplementationPseudocode using public helpers:

if $DIALEDNUMBER starts with "012" thenstrip off "012" from $DIALEDNUMBERsend SIP INVITE to

[email protected] dial-as-normal


http://freenum.org/

ISNMIT DeploymentMotivation

• 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!


http://freenum.org/

ISNMIT DeploymentUse 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


http://freenum.org/

ISNMIT DeploymentIssues

• 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


http://freenum.org/

ISNMIT Deployment

MIT PBX

SIP/PRIGateway

MIT Asterisk Server

Campus Network

Internet

MIT PBX user dials *0

freenum.org

MIT SIP Proxy Servers

Server prompts for number: User dials 248911*Server prompts for domain: User dials 262#

FWD phone rings

DNS lookup for 262


http://freenum.org/

ISNSelf-DemoCall: +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


http://freenum.org/

ISNFor More InformationISN Cookbook, FAQ, and other info

• http://freenum.org/

Contact us:• Ben Teitelbaum

–[email protected] | 7031*260

• John Todd–[email protected] | 2203*256

• Dennis Baron–[email protected] | 21232*270

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ISN: Free Numbers Fast Dennis Baron, MIT Ben Teitelbaum, Internet2 John Todd, Loligo September 13...

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