On behalf of the Organizing and Program Committees of the 3rd European Conference on Universal Multiservice Networks (ECUMN 2004), it is our great pleasure to introduce the proceedings of ECUMN 2004, which was held during October 25 27, 2004, in Porto, Portugal. In response to the Call for Papers, a total of 131 papers were submitted from 29 countries. Each paper was reviewed by several members of the Technical Program Committee or by external peer reviewers. After careful assessment of thereviews,53paperswereacceptedforpresentationin13technicalsessions;half of them originated from countries outside Europe (mainly Asia). This illustrates the strong interest of this conference beyond its original geographical area. The conference program covered a variety of leading-edge research topics which are of current interest, such as wireless networks, mobile ad hoc networks, sensor networks, mobility management, optical networks, quality of service and tra?c, transport protocols, real-time and multimedia, Internet technologies and applications, overlay and virtual private networks, security and privacy, and network operations and management. Together with three plenary sessions from France T el ecom, Siemens, and Cisco Systems, these technical presentations - dressed the latest research results from the international industry and academia and reported on ?ndings on present and future multiservice networks."

The refereed proceedings of the 6th IEEE International Conference on High Speed Networking and Multimedia Communication, HSNMC 2003, held in Estoril, Portugal in July 2003. The 57 revised full papers presented were carefully reviewed and selected from 105 submissions. The papers are organized in topical sections on integrated differentiated services, multicasting, peer-to-peer networking, quality of service, QoS, network and information management, WDM networks, mobile and wireless networks, video, CDMA, real time issues and protocols for IP networks, multimedia streaming, TCP performance, voice over IP, and traffic models.