iation protocol (sip). In ICNS '06. IEEE Computer Society, July. [16] Seedorf, J. 2006. Using cryptographically generated SIP-URIs to pro- tect the integrity of content in P2P-SIP. In 3rd annual VoIP security workshop, June. [17] Rosenberg, J., J. Weinberger, C. Huitema, and R. Mahy. 2003. STUN- Simple traversal of User Datagram Protocol (UDP) through Network Address Translators (NATs). IETF RFC 3489, March. [18] Bryan, D.A., E. Shim, and B.B. Lowekamp. 2007. Use cases for peer- to-peer session initiation protocol. IETF draft-bryan-p2psip-usecases-00, July. [19] Bryan, D., P. Matthews, E. Shim, and D. Willis. 2007. Concepts and terminology for peer to peer SIP. IETF draft-ietf-p2psip-concepts-01, November. © 2009 by Taylor & Francis Group, LLC SIP: Advanced Media Integration* Marisol Hurtado i2CAT Foundation Andre Rios, Antoni Oller, and Jesus Alcober Polytechnic University of Catalonia Sebastia Sallent i2CAT Foundation CONTENTS 2.1 Introduction 2.2 Building Advanced Media Services Service-Oriented Architecture (SOA) MPEG-21/SIP-Based Cross-Layer 2.5 Service Convergence Platform of Telecom Operators SIP and the Future of the Internet 2.7 Experimental Results References 2.1 Introduction The explosive growth of Internet Protocol (IP) networks capable of provid- ing sophisticated convergent services based on multimedia applications has increased the development of new services as an alternative to traditional com- munication systems. In this way, the service convergence is growing under an IP-based provisioning framework and controlled mainly by lightweight appli- cation level protocols like Session Initiation Protocol (SIP) [1]. SIP, a key technology enabling this evolution, is creating new possibili- ties to develop multi-modal communications. SIP increases the possibilities of developing integrated multimedia services and offers advantages such as independence from the underlying transport network, session establishment with the involvement of multiple devices and the support for mobility. * This research was sup