NORDUnet 2014 23 September 2014 Uppsala, Sweden
Peter Szegedi Project Development Officer [email protected] www.terena.org
Numbering All the Bones Identity
› Peter Szegedi › [email protected] › szegedip › [email protected] › Amsterdam › +31 20 530 4498 › Hungarian › +31 6 125 22023 › Budapest › szegedi1pet320 › 563772LA › [email protected] › 4362782218 › 192.87.30.166
› Who I am › How to reach me NAMING & NUMBERIG ADDRESSING
Name translates to an But who’s behind that address. address?
Slide 2 The identity paradox
› An assigned telephone number has an end-user but the end-user has no face. There are many corner cases. › Complex authentication and number validation problem. Even the service provider cannot identify the used from a large number block.
› Liar paradox (Catch 22):
› “I am lying.” This statement is neither true nor false because it is self-referential.
› “I am the valid End-user because the provider that I select identified me as such.” This statement is also circular and/or self-referential.
Slide 3 To break the end-user identity paradox
› External database › Registration, public vetting, and aging › Lookup service (DNS)
ENUM database
End-user Opt-in ENUM
Slide 4 From address chaos to address harmony
› Service centric vs. User centric
› Separate naming/numbering from the underlying addressing and transport › Service agnostic addressing scheme centered around the user
Slide 5 Why telephone numbers
› Telephone numbers are global, uniform, and standardized resource identifiers. › All E.164 telephone numbers are known to the network because every phone is registered by default in a global arrangement. › In contrast, SIP URI relies on the user to populate a record in DNS. › That is why many IP to IP calls today route through the PSTN.
› IP-based devices may register with a local server, a web site, or an IP PBX but there is no universal address directory until ENUM is completed.
Slide 6 What does ENUM do
› Maps existing PSTN phone numbers to service specific addresses › +31205304488 h323: 00312053044889 sip: [email protected] tel: +31205304488 e-mail: [email protected] › Based on state-of-the-art DNS › Follows a user centric approach › does not affect PSTN application level functions such as call routing and signaling › facilitates the discovery of resources associated with a telephone number, and does not impact how applications operate › does not change the existing right-to-use rules and principles for telephone numbers
Slide 7 How it works
ENUM (DNS) mapps PSTN number to sip:[email protected] to enable Voice over IP using SIP
3. DNS returns NAPTR record containing SIP URL
2. Calling party proxy UAC queries DNS for location of end point
1. The caller simply dials the person’s normal telephone number
4. Calling party UA connects the call
Slide 8 How it works
ENUM (DNS) mapps PSTN number to sip:[email protected] to enable Voice over IP using SIP ENUM 3. DNS returns NAPTR record containing SIP URL to Calling Party UA
2. SIP UAC queries DNS for location of end point Response sip:[email protected] Query 4.3.2.1.5.5.5.3.1.6.1.e164.arpa? Call Setup
1. Caller dials normal Sip phone number Sip:[email protected] SIP SIP Dial Proxy Proxy +1-613-555-1234 4. Caller’s UA initiates call with SIP URL
Slide 9 What is this all for
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0 a) Mapping PSTN b) Looking up c) Directing d) Substituting e) Creating a numbers to services/access (primarily long direct peering universal VoIP/ Unified Resource methods (e.g., distance) calls relationships – VC directory for Identifiers SIP URI, GDS over research i.e. accepting R&E - i.e. global (URIs) in order to Number, Web networks end-to- incoming calls on arrangement for support dialling URL, etc.) end – i.e. an open, public registering and on devices with assigned to PSTN bypassing carrier interface publishing end- numerical keypad numbers in networks and governed by user reachability only – i.e. yet various domains saving PSTN NRENs. in a structured, another lookup – i.e. service carrier or IP verifiable way. service before discovery. peering costs. placing the call. What is this all for b) Address harmony b) One single ENUM (PSTN fallback) for unified dialing c) Service agnostic (service discovery) c) Cost savings b) Long distance calls over NREN end-to-end c) Reduce peering traffic to commercial networks d) Scalability b) No need for direct peering c) Accept calls on a public interface (DNSsec!) e) User identity b) Registration, validation and aging c) Portability
Slide 11 How to communicate this a) Dial from everywhere! › No language, alphabet, or device barriers
› Take no technical but business approach › Reverse business model (difficult to justify though) › More ENUM you call the cheaper your bill will be
› Community effort is needed, once you join
Slide 12 NRENum.net service of TERENA
› ENUM service for academia › Operated and governed by NRENs › Recognized by RIPE ENUM WG (e164.arpa)
Slide 13 Service milestones
› August 2006 – NRENum.net came into operation › May 2008 – Became a community service › March 2012 – Service went global › September 2013 – Global governance
Service policy can be downloaded from https://confluence.terena.org/display/NRENum/Service+policy+v.0.62
Slide 14 Global service coordinated by TERENA
› Global NRENum.net Governance Committee (GNGC) › Tim Boundy Janet, UK › Erik Kikkenborg NORDUnet, Nordic countries in Europe › Ben Fineman Internet2, USA › Alex Galhano Robertson RNP, Brazil › Jamie Sunderland AARnet, Australia › Praveen Misra ERNET, India › NRENum.net Opertions Team › Mihaly Meszaros NIIF, Hungary › Daniel Stirnimann SWITCH, Switzerland › Rui Ribeiro FCCN, Portugal › Bartlomiej Idzikowski PSNC, Poland › Jan Ruzicka CESNET, Czech Republic › Kewin Stoeckigt ACM › Bernie Hoeneisen Ucom.ch › DNS server locations › Budapest, Hungary › Ann Arbor, Michigan, USA › Sydney, Australia › Zagreb, Croatia › Washington DC, USA › Perth, Australia › Zürich, Switzerland › Indianapolis, Indiana, USA › Stockholm, Sweden › Palo Alto, California, USA
Slide 15 36 County Codes delegated 186.000< ENUM Global initiatives to support ENUM dialling
› Internet2 Net+ Video Exchange
› Global Video Aliance (GVA) › Internet2, AARnet, RedCLARA, NORDUnet, Janet, CESNET › Global RealTime Communications exchange (GRTC) › CEO Forum – led by AARnet
› GÉANT eduCONF › GN3plus - led by Janet
Slide 18 How to participate...
› Want your county code to be delegated... › Contact Peter Szegedi, TERENA › Website: http://www.nrenum.net › Send your request to
› in Europe and Asia Pacific and Africa, talk to TERENA › In the Nordics talk to Erik Kikkenborg, NORDUnet
› in North America, talk to Internet2
› in Latin America, talk to RedCLARA
Slide 19 Bad practices
1. Get delegated and do nothing › Set up a national policy › Sub-delegation › Tools to support number registration
2. Use virtual numbers › Sometimes inevitable (e.164 number shortage) › We are flexible but we must avoid (future) clash › From sandbox to Telco/Regulator liaison › Global CC is not realistic as of today...
3. Wildcard number blocks › Identity problem still › Crawler issue
Slide 20
To do list...
› Regulators › Require VoIP/Telco operators to provide SIP URIs › Require national domain registry to support ENUM › Require Telco’s to have ENUM enabled gateways › Provide PSTN number as a resource › Telco/VoIP providers › Use ENUM lookups in routing decisions › Make money on call termination
› Web community › Solve the address chaos, single sign on › Facilitate ENUM for application specific addresses › NREN community › Solve the identity paradox, authentication and validation
Slide 21 Window of opportunity
› Greenfield approach... › FCC call on ”All-IP communications and numbering testbeds” › Dialog with PHONEWORD.org
› Telcos are hesitant, Web world is excited! › Replace SS7 with ENUM federation › NRENum.net could be one of the ENUM trees › Demonstrate success to the global community...
Slide 22 GN4 SA8 – Real Time Applications and Multimedia Management
› Task 1 – Real Time Applications (RTA) › eduCONF (H323/GDS) › SIP/URI › NRENum.net Europe
› Task 2 – Web Real Time Communications (WebRTC) › Roadmap for NRENs › Demonstrator
› Task 3 – Open Educational Resource (OER) › Metadata aggregation engine › Web portal front-end
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