Nowadays, networks and telecommunications are two of the most active ?elds. Research and development in these areas have been going on for some time, reaching the stage of products. The objectives of HSNMC 2004 (International Conference on High Speed Networks and Multimedia Communications) were to promote research and development activities and to encourage communication between academic researchers and engineers throughout the world in the areas related to high-speed networks and multimedia communications. The seventh edition of HSNMC was held in Toulouse, France, on June 30- July2, 2004. Therewere266submissionsto HSNMCthisyearfrom34countries, which were evaluated by program committee members assisted by external – viewers. Each paper was reviewed by several reviewers. One hundred and one papers were selected to be included in these proceedings. The quality of s- missions was high, and the committee had to decline some papers worthy for publication. The papers selected in this book illustrate the state of the art, current d- cussions, and development trends in the areas of networks, telecommunication and multimedia applications. The contributions published in this book und- line the international importance of the related ?eld of research. They cover a variety of topics, such as Qo S in Di?Serv networks, Qo S analysis and m- surement, performance modelling, TCP modelling and analysis, MPLS for Qo S provision, scheduling and resource allocation, routing, multicast, security and privacy issues, peer-to-peer applications, video applications, software and m- dleware for networks, mobile networks, mobility, satellite, mobile IP, wireless networks, WLAN, ad hoc networks, 3G/UMTS, IEEE 802.