e164.org
e164.org is an alternative to "official" (e164.arpa) ENUM. Here are the similarities and differences:
- Like e164.arpa, e164.org maps E.164 numbers to SIP URIs.
- e164.arpa is approved by ITU (which is dominated by PSTN telephone companies?), is available in less than 10 countries, and has been stalled since 2002. e164.org is available now worldwide, but has not been ITU-approved.