This volume forms the edited proceedings of the Sixth International Symposium on Communications Interworking, held in Perth, Western Australia, from 13-16 October, 2002. In total, 39 research papers were submitted for consideration, and after full refereeing by international referees, 27 papers from authors in 11 countries were accepted for publication. Invited keynote addresses were presented by Dr Hugh Bradlow, Chief Technology Offleer for Telstra Corporation, Australia, and Dr Sathya Rao, Director ofTelscom A.G., Switzerland. The symposium brought together 60 active international researchers and telecommunications engineers to discuss the important questions as to whether there is a convergence of all communications, including real-time communications, over the Internet