This book presents research results on data dissemination in mobile networks and peer-to-peer systems for mobile devices. The main focus is a novel resource-sharing mechanism for mobile devices that introduces a new paradigm of information-sharing cooperation among mobile devices not necessarily connected to the internet. The book is geared to the needs of researchers and practitioners in industry, and is also suitable for advanced-level students in computer science and electrical engineering.

"What a di?erence a year makes - 52 little weeks" This variation of the ?rst line from Dinah Washington's famous song, which originally reads, "What a di?erence a day makes - 24 little hours," brings it to the point: Accordingtoallexperts,thepress,andmostpeople'simpressionwearetoday in a serious economic recession. Less than one year ago, we practically lived on the "island of the blessed" (namely, at Networking 2008 that was held on the island of Singapore), or in the famous country where "milk and honey ?ow" (or "where wine and liquor ?ow"). This convenient situation has changed abruptly within less than 52 weeks. It looks like the same kind of problems has emerged in all areas - and the "Networking" area has, of course, been a?ected, too. Looking into the 2009 proceedings, however, you will immediately notice that the manuscripts are largely una?ected by any aspect of the economic c- sis (which should be a bit of a consolation). Apparently, research directions are dictated by a process that is all too sluggish in order to be quickly and radically changed by a "tsunami." Likewise, the conference itself was prepared in spite of such a crisis.

These are the proceedings of IPTComm 2008 - the Second Conference on Pr- ciples, Systems andApplications ofIP Telecommunications-heldinHeidelberg, Germany, July 1-2, 2008. The scope of the conference included recent advances in the domains of convergent networks, VoIP security and multimedia service environments for next generation networks. The conference attracted 56 s- missions, of which the Program Committee selected 16 papers for publication. The review process followed strict standards: each paper received at least three reviews. We would like to thank all Program Committee members and external reviewers for their contribution to the review process. The conference attracted attendees from academia and industry. Its excellence is re?ected in the quality of the contributed papers and invited talks. Additional industry talks and - plied demonstrations assured a synergy between academic and applied research. We would also like to acknowledge and thank our sponsors, many of whom s- portedtheconferencegenerously: NEC, AT&T, Codenomicon, IPTEGO, EADS, Cellcrypt, MuDynamics, SIP Forum and EURESCOM, Finally, we would like to thank all the researchers and authors from all over the world who submitted their work to the IPTComm 2008 conferenc

This book presents research results on data dissemination in mobile networks and peer-to-peer systems for mobile devices. The main focus is a novel resource-sharing mechanism for mobile devices that introduces a new paradigm of information-sharing cooperation among mobile devices not necessarily connected to the internet. The book is geared to the needs of researchers and practitioners in industry, and is also suitable for advanced-level students in computer science and electrical engineering.