ISN: Free Numbers Fast

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1 : Free Numbers Fast Dennis Baron, MIT Ben Teitelbaum, Internet2 John Todd, Loligo September 13 th, 2006 Fall VON, Boston, MA

2 PSTN foo.edu 2

3 foo.edu Internet 3

4 foo.edu VoIP Service Provider 4

5 VoIP brought to you by foo.edu 5

6 RTC brought to you by foo.edu 6

7 Old World / New World Radically new devices / services ben@internet2.edu Deep bureaucratic hierarchy The world is flat (almost) Telco provider control Be your own provider 7

8 SIP.edu address as RTC handle 250k.edu users 8

9 Unfortunately, it s hard to enter alphanumeric addresses on this: 9

10 Numbers 21232*270 Domain-local (you allocate) ITAD (IANA allocates) [RFC3219] 10

11 ITAD Subscriber Numbers Defined by Telephony Routing over IP (TRIP) [RFC3219] Globally unique Lots of them (256 through ) IANA is already set up to allocate resolution works just like ENUM 11

12 Academic Internet2 Hofstra University Apple Computer 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 VoIP Solution Providers Others BizFu Tello Iotum Digium Nokia Manitoba New Democratic Party Packet Clearing House Trial Participation 67 domains from 14 countries ITAD Assignments 153 domains from 17 countries VoIP Service Providers Free World Dialup Stealth Communications SIPcall.com RCN Corporation VoIPteq SIP Broker TellMe PhoneGnome Government State of Oregon 12

13 Costs ITAD Subscription: Free License restrictions: None Monthly recurring: None Tech time: Small User instruction: Medium 13

14 Benefits 1/2 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 14

15 Benefits 2/2 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 (standardsbased!) 15

16 vs ENUM vs SIP AOR E.164 SIP AOR Example 7031* Familiarity Unfamiliar Phone numbers 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 16

17 ENUM in a Nutshell 1. Take an E.164 number Convert it to FQDN e164.arpa. 3. Query DNS for NAPTRs 4. Apply resulting regexs to get list of URIs: e164.arpa. 1.e164.arpa e164.arpa. x.x.x.1.e164.arpa. sip:bdr@internet2.edu mailto:bdr@internet2.edu sip:bobr_621@att.sbc.com 17

18 in a Nutshell 1. Take an 2. Convert it to FQDN 4257* freenum.org. 3. Query DNS for NAPTRs freenum.org. 4. Apply resulting regexs to get list of URIs: sip:bdr@internet2.edu mailto:bdr@internet2.edu sip:bobr_621@att.sbc.com 260.freenum.org. Note: We are working to ensure that the root zone will be administered on behalf of the user community by a neutral, non-profit organization. Following the trial, the root may or may not be freenum.org. 18

19 3 Easy Steps 1. Request an ITAD from IANA 2. Publish your ITAD/ information in DNS 1. Option1: Put full NAPTR in root zone *.xxx.freenum.org IN NAPTR "u" "E2U+sip 2. Option2: Have root zone delegate to your own nameservers 3. Enable inbound / outbound calling 1. Recipes for SER and Asterisk available 19

20 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 20

21 SER Implementation 1/2 Inbound: No changes if your system supports inbound SIP extension calls Otherwise, can alias s to URIs and resolve (see Cookbook for example) 21

22 SER Implementation 2/2 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 \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 Call %ru(from [%fu], To [%tu])\n"); # Relay the message if (!t_relay()) { sl_reply_error();}; }; } # end of route block 22

23 Dumb ipbx Implementation Pseudocode using public helpers: if $DIALEDNUMBER starts with "012" then strip off "012" from $DIALEDNUMBER send SIP INVITE to else dial-as-normal 23

24 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! 24

25 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 25

26 MIT Deployment Issues Easy to implement native 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 calls 26

27 MIT Deployment DNS lookup for 262 freenum.org Internet MIT SIP Proxy Servers MIT Asterisk Server Campus Network FWD phone rings SIP/PRI Gateway Server prompts for number: User dials * Server prompts for domain: User dials 262# MIT PBX MIT PBX user dials *0 27

28 Self-Demo Call: Listen to the IVR Enter an 87225* * *256 - MIT Shuttle Track - Tello success message - Recorded monkeys, echo test 28

29 For More Information Cookbook, FAQ, and other info Contact us: Ben Teitelbaum 7031*260 John Todd 2203*256 Dennis Baron 21232*270 Q&A right now 29

Internet Peering and PSTN Access

Internet Peering and PSTN Access Merit VoIP Seminar Dennis Baron April 3, 2008 Page 1 Outline It s all SIP! SIP.edu ISN PSTN Access Page 2 Well You Are Using SIP Anyway What is SIP IETF Standard defined