administration liaison ietf enum domain names number portability telecommunication itu e.164 dns

architecture standards security naptr protocols routing service discovery e.164 dns metadata

standards global switched telephone network number portability telecommunications call routing interoperability regulatory compliance service provider number portability e.164 database queries

gstn dtmf standards track dial sequences e.164

enum uri e.164 dns registration

voip sip enum naptr e.164

epp domain names standards security iana naptr xml internationalization e.164 provisioning

architecture enum domain names security data flow validation e.164 dns registration

voip security considerations parameter enum tel uri standards track e.164 network elements iana considerations

enum security uri im protocol instant messaging standards track e.164 dns

voip security routing infrastructure enum e.164

voip security considerations authorization uri ddds network management interoperability infrastructure enum e.164 dns

enum security uri naptr dynamic delegation discovery system routing standards track authentication e.164 dns