ENUM - A ponte entre a rede pública de telefonia e a Internet

ENUM [[RFC 3761]] é um protocolo que utiliza o sistema DNS da Internet para traduzir números de telefone E.164? em esquemas de números IP(como SIP, H.323 ou email). A RFC 3761 substituiu a [[RFC 2916]] em Maio de 2004.

**Status do deployment do ENUM em vários países**

[[ENUM Progress Matrix]] matido pelo grupo de trabalho RIPE ENUM.

**Algumas RFCs**

    * [[RFC 2915]]: NAPTR RR?
    * [[RFC 2916]]: ENUM Protocol (obsoleta)
    * [[RFC 3761]]: ENUM Protocol (subistitui a RFC 2916)
    * [[RFC 3762]]: Usando endereços H.323 no protocolo ENUM
    * [[RFC 3764]]: Usando endereços SIP no protocolo ENUM
    * [[RFC 3026]]: Berlin Liaison Statement
    * [[RFC 2870]]: Root Name Server Operational Requirements 


ENUM já é suportado por SIP Proxies SER ou SNOM 4s, VoIP gateways como Asterisk, Cisco e telefones SIP como o SNOM 200.

From the RFC abstract:


In short, a server with ENUM support will lookup a dialled telephone number in DNS to see if there's alternate ways to set up the call instead of just calling out on the PSTN telephone line. ENUM may contain a reference to a SIP URL, a telephone number to dial, a web page or an e-mail address.

Enum uses DNS NAPTR resource records.

**News**

    * First ENUM plugtest at ETSI in Nov-Dec? 2004 http://www.etsi.org/plugtests/ENUM.htm 


**Software support**

    * [[Asterisk]] tem um módulo que suporta o ENUM
    * SIP Express Router? tem um módulo que suporta o ENUM
    * [[PowerDNS]] supports NAPTR and many (custom even!) back-ends.
    * Bind from [[ISC]], version 9. Please note that earlier versions of bind might give you trouble with wildcard records in ENUM.
    * AG Projects [[Managed DNS]] platform has web management interface for DNS NAPTR and SRV records
    * Sentiro's [[ENUM lookup webpage]] - Lookup ENUM records worldwide (UK)
    * Alex Mayrhofer's [[ENUM lookup webpage]] - Lookup ENUM records worldwide (Austria)
    * Adrian Georgescu's [[Managed DNS lookup webpage]] - (NL)
    * [[The Voice Peering Fabric]] - [[ENUM Lookup Page]] 


**Record syntax**

    * ENUM syntax: Sintaxe de registros ENUM nas zonas DNS. 


**Organizações envolvidas no ENUM**

    * [[RIPE]] - Tier 0 administrator for "official" e164.arpa ENUM top level domain
    * [[ITU-T TSB]] - International Telecommunication Union
    * [[ETSI]] - European Telecommunications Standards Institute 


**Links**

    * E164.org - A free, public validated ENUM service supporting both "real" and "free" 882 numbering and a variety of NAPTR service types including VoIP, mailto and IM.
    * E164.dk - Danish ENUM service
    * The Voice Peering Fabric [[ENUM Registry]] Service/Layer2 peering point - million of numbers reachable at zero cost.
    * [[IETF Enum page]]
    * [[ITU Enum page]]
    * Good overview here: http://www.enum.info/
    * ENUM Reference: http://www.ngi.org/enum/
    * ENUM Reference: http://www.cybertelecom.org/enum.htm
    * [[ENUM Forum]] 

**Artigos**

    * IEEE - [[Carriers and Users Prepare to Midwife ENUM]]
    * Lightreading - [[Carrier ENUM Gains Ground]]
    * Article at www.SIPCenter.com by Adrian Georgescu\\ http://www.sipcenter.com/sip.nsf/html/ENUM+on+its+way+to+maturity
    * Article in NWfusion.com http://www.nwfusion.com/news/2001/0430enum.html 


**Veja também**

    * DUNDi Alternativa Peer-to-peer para o ENUM