This volume makes a contribution to the debate on whether there is a convergence of all communications, including real-time communications, over the Internet Protocol (IP), and whether existing IP technology is capable of supporting this convergence, or whether it requires further development of that technology. The papers present cutting-edge research on the topics of converged networking, real-time communications over IP, quality of service, routing and metrics, emerging issues in mobile networks, differentiated services, and wireless networking. The book comprises the edited proceedings of the Sixth International Symposium on Communications Interworking, which was sponsored by the International Federation for Information Processing (IFIP) and held in Perth, Western Australia in October 2002.