IAX: Inter-Asterisk eXchange Version 2. - Mark A. Spencer; Brian Capouch; Ed Guy; Frank Miller; Kenneth C. Shumard (RFC, 2010)

IANA Considerations for IAX: Inter-Asterisk eXchange Version 2. - Ed Guy (RFC, 2010)

IANA Registration for Enumservice 'iax'. - Ed Guy; Klaus Darilion (RFC, 2011)