of the 2nd International Workshop on Mobility Management and Wireless Access Protocols, 127-129. Kwon, T. T., M. Gerla, S. Das, and S. Das. 2002. Mobility management for VoIP service: Mobile IP VS. SIP. IEEE Wireless Communications 9(5): 66-75. Lach, H. Y., C. Janneteau, and A. Petrescu. 2003. Network mobility in beyond-3G systems. IEEE Communications Magazine 41 (7): 52-57. Nakajima, N., A. Dutta, S. Das, and H. Schulzrinne. 2003. Handoff delay analysis and measurement for SIP Based Mobility in IPv6. Proceedings of the IEEE International Conference on Communications (ICC) 2: 1085 1089. C 2009 by Taylor & Francis Group, LLC SIP Handbook: Services, Technologies, and Security Ng, C., P. Thubert, M. Watari, and F. Zhao. 2006a. Network mobility route optimization problem statement. IETF DRAFT: draft-ietf-nemo- ro-problem-statement-03.txt (work in progress). Ng, C., F. Zhao, M. Watari, and P. Thubert. 2006b. Network mobility route optimization solution space analysis. IETF DRAFT: draft-ietf-nemo-ro- space-analysis-03.tat (work in progress). Perkins, C. 2000. Mobile IP and the IETF. ACM SIGMOBILE Mobile Com- puting and Communications Review 4(3): 6-11. 2002. IP Mobility Support for IPv4. IETF RFC 3220. Rosenberg, J., H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Han-dley, and E. Schooler. 2002. SIP: Session Initiation Pro- tocol. IETF RFC 3261. Vali, D., S. Paskalis, A. Kaloxylos, and L. Merakos. 2003a. A SIP-based method for intra-domain handoffs. Proceedings of the IEEE Vehicular Technology Conference (VTC) 3(8): 2068-2072. 2003b. An efficient micro-mobility solution for SIP networks. Proceed- ings of the IEEE Global Telecommunications Conference (GLOBECOM) 6:3088-3092. C 2009 by Taylor & Francis Group, LLC SIP Event Notification and Presence Information Bo Zhao The Pennsylvania State University Chao Liu Yahoo! Inc. CONTENTS 5.1 Introduction 5.2 Session Initiation Protocol (SIP)-Specific Event Notification Simple Presence Information Presence Information Data Format (PIDF) Event List-Notificat