https://app.kbone.net/vault/rfc/docid/4820
RFC4415: IANA Registration for Enumservice Voice
Network Working Group R. Brandner Request for Comments: 4415 Siemens AG Category: Standards Track L. Conroy Siemens Roke Manor Research ...
https://app.kbone.net/vault/rfc/docid/6016
RFC5527: Combined User and Infrastructure ENUM in the e164.arpa Tree
Network Working Group M. Haberler Request for Comments: 5527 IPA Category: Informational O. Lendl enum.at ...