ENUM

IETF’s E.164 Number Mapping standard uses Domain Name Server (DNS) to map standard International Telecommunication Union (ITU-T) international public telecommunications numbering plan (E.164) telephone numbers to a list of Universal Resource Locators (URL). SIP uses these URL’s to initiate sessions.

For example, ENUM DNS [RFC 2916] converts a telephone number in E.164 format,

e.g. +46812345, and returns e.g., a Universal Resource Identifier (URI) SIP:olle.svenson@telia.se

Thus a SIP client makes a connection to the SIP gateway telia.se passing the local part olle.svenson.

ENUM can return a wide variety of URI types.

RFC 3761: The E.164 to URI DDDS Application (ENUM) updates the ENUM specification to be compatible with the Dynamic Delegation Discovery System (DDDS) Application specification in RFC 3401.

Slide Notes

P. Faltstrom, “E.164 number and DNS”, IETF RFC 2916, September 2000, Obsoleted by RFC 3761. http://www.rfc-editor.org/rfc/rfc2916.txt Links to an external site.

P. Faltstrom and M. Mealling, “RFC 3761: The 164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDS) Application (ENUM)”, IETF RFC 3761, Obsoleted by RFCs 6116 and 6117, April 2004 http://www.rfc-editor.org/rfc/rfc3761.txt Links to an external site.

Bradner, L. Conroy, and K. Fujiwara, ‘The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS) Application (ENUM)’, Internet Request for Comments, vol. RFC 6116 (Proposed Standard), March 2011, Available at http://www.rfc-editor.org/rfc/rfc6116.txt.

Hoeneisen, A. Mayrhofer, and J. Livingood, ‘IANA Registration of Enumservices: Guide, Template, and IANA Considerations’, Internet Request for Comments, vol. RFC 6117 (Proposed Standard), March 2011, Available at http://www.rfc-editor.org/rfc/rfc6117.txt Links to an external site..

M. Mealling, “Dynamic Delegation Discovery System (DDDS) Part One: The Comprehensive DDDS”, Internet Request for Comments, RFC Editor, RFC 3401 (Informational), ISSN 2070-1721, October 2002 http://www.rfc-editor.org/rfc/rfc3401.txt Links to an external site.

Transcript

[slide218] ENUM was to be a mapping between the E.164 numbers and a SIP URI. So with that phone number we might get that SIP URI. And there's an RFC that discusses this, and there's been a lot of work done on ENUM.