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"Having gained partners from North America, Latin America and Asia Pacific, has grown to a global, production-grade, community service in recent years. As one of the key building blocks of global unified communications, it is TERENA's mission to coordinate and continuously enhance the service for the benefit of the entire research and education community in a sustainable manner."

        Michael Nowlan, Chief Technical Officer at TERENA

Currently 35 country codes are delegated in More information about the service can be found here.


  • 02 April 2014 - Welcome Peru (+51) to! On behalf of RAAP (Red Académica Peruana), INICTEL-UNI (Instituto Nacional de Investigación y Capacitación de Telecomunicaciones) looks after the 35th county code delegated to 
  • 28 February 2014 - Welcome Singapore (+65) to! SingaREN looks after the 34th country code delegated to
  • 24 February 2014 - Welcome Comombia (+57) to! RENATA looks after the 33rd country code delegated to
  •  25 September 2013 - TERENA Executive Committee noted the updated Service policy v.0.62 that describes the role of the new Global Governance Committee (GNGC) in conjunction with the technical Operations Team (OT). Read the full story for more information.
  • 12 August 2013 - Welcome Romania (+40) to! RoEduNet, the Romanian NREN, is the 32nd country code delegated to
  • 01 August 2013 - Welcome New Zealand (+64) to! REANNZ, New Zealand's research and education network, is the 31st country code delegated to the tree.
  • 28 June 2013 - service community has started to collect simple use cases and/or success stories in order to promote the use of the service at universities and campuses. Read the first use case in the row on how " enhances University of Michigan role in global collaboration".
  • 30 May 2013 - Register and come to the "SIP-based video calling via " tutorial & hands-on training on the day before the TERENA Networking Conference 2013 (Sunday, 2 June, 2013). Read the full story for more information.
  • 20 March 2013 - Service policy v.0.5 is now into effect. It contains two small clarifications in the C. Membership section implied by the delegation of NORDUnet's countries and RENATER's overseas territories; the addition of C.1.3 and C.4 respectively. This is one of the results of the joint workshop (on 18-19 March 2013, in Amsterdam, Netherlands). Read the full story for more information.
  • 01 March 2013 - France in the Indian Ocean (+262), Guadeloupe (+590), French Guiana (+594), Martinique (+596), New Caledonia (+687), and French Polynesia (+689) have been delegated to the tree by RENATER, the French NREN. Currently, there are 30 country codes delegated to the tree.
  • 19 February 2013 - Welcome Denmark (+45) and Sweden (+46) to! NORDUnet, the Nordic Infrastructure for Research & Education, acts on behalf of DeIC, Denmark and SUNET, Sweden handling these zone delegations.
  • 13 February 2013 - Welcome France (+33) to! RENATER, the French NREN, is the 22nd member to join the tree.
  • 11 February 2013 - Welcome Hong Kong (+852) to! HARNET, the Hong Kong Academic and Research Network, is the 21st member to join the tree.
  • 30 January 2013 - Welcome India (+91) to! ERNET, the National Research and Education Network of India, is the 20th member to join the tree.
  • 23 January 2013 - The agenda of the GN3 eduCONF - TERENA joint pilot workshop is now available online. The workshop will be held on 18-19 March 2013 hosted by TERENA Secretariat in Amsterdam, The Netherlands.
  • 17 December 2012 - Number ranges of the University of Michigan, MI, USA, have been sub-delegated to the +1 zone operated by Interber2. The trial period is considered to be closed, the +1 delegation is now fully operational. 
  • more...



About ENUM and

ENUM is a standard protocol that is the result of work of the Internet Engineering Task Force's (IETF's) Telephone Number Mapping working group. ENUM combines telephone numbers and the Domain Name System to simplify the way that VoIP calls (telephone calls made over the Internet) work. It allows more VoIP calls to be connected directly over the Internet, for no charge, rather than via the traditional PSTN network. ENUM translates a telephone number into a domain name. This allows users to continue to use the existing phone number formats they are familiar with, whilst allowing the call to be routed using DNS. This makes ENUM a quick, stable and cheap link between telecommunications systems and the Internet.

IETFRFC 3761 discusses the use of the Domain Name System (DNS) for storage of E.164 numbers. More specifically, how DNS can be used for identifying available services connected to one E.164 number. RIPE NCC provides DNS operations for "" zone (known as Golden ENUM tree) in accordance with the Instructions from the Internet Architecture Board. is a global ENUM service for academia (i.e. the research and education communty) that uses a private dialing plan. is considered as a complementary service and a valid alternative to the Golden ENUM tree. provides countries, even if the Golden ENUM Tree is not available there, with the possibility to publish ENUM data. The tree can be queried publicly by anyone but only the registered NRENs of the participating countries can populate the tree. It is recommended to all VoIP operators to query both the and the trees.

The domain "" is being populated in order to provide the infrastructure in DNS for storage of E.164 numbers. Holders of E.164 numbers which want to be listed in DNS should contact according to the Policy Document. More information about the service can be found here.

Initial benefit of - cheaper calls between VoIP systems

The most important benefit of is that it enables NRENs (and their stakeholders) with a VoIP system to locate other NRENs with VoIP systems and call them directly across the Internet, bypassing the ordinary telephone system and thereby costing no more than the rental already being paid for the Internet connection.

Future benefits - interoperability of applications and new services allows NRENs to publish much more information to be associated with telephone numbers than just how to make a call to that number. For example, one can publish Video Conferencing numbers (GDS), telepresence numbers, email addresses or other location information. The community anticipates interesting applications that take advantage of this to start to appear and provide even greater benefit to using

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