On May 21, 2001 the child support reciprocity agreement between Australia and the U.S. became effective and Australia was declared a Foreign Reciprocating Country.
www.humanservices.gov.au/customer/information/child-support-website?u...
Reciprocating Agreement with Australia
A Caseworker's Guide to Processing Cases with Foreign Reciprocating Countries
IRG - Contact Information Overview of Processing International Cases with Australia