 Rosenberg, J. 2002. SIP: Session Initiation Protocol. RFC 3261. Schulzrinne, H. 1996. RTP: A transport protocol for Real-Time applications. RFC 1889. © 2009 by Taylor & Francis Group, LLC SIP and IPv6 Schulzrinne, H. 2002. Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session Initiation Protocol (SIP) Servers. RFC 3361. Schulzrinne, H., and B. Volz. 2003. Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initiation Protocol (SIP) Servers. RFC 3319. TISPAN, TR180001. 2006. Telecommunications and Internet converged Ser- vices and Protocols for Advanced Networking, NGN Release 1. Xing, J., and J.W. Atwood. 2005. SIP end-to-end security between IPv4 domain and IPv6 domain. SoutheastCon, 2005. Proceedings IEEE 8-10, April 2005, 501-6. © 2009 by Taylor & Francis Group, LLC SIP Mobility Management Chung-Ming Huang National Cheng Kung University Chao-Hsien Lee Kaohsiung Medical University CONTENTS SIP-Based Host Mobility SIP-Based Network Mobility Protocol Analysis References Session Initiation Protocol (SIP) is an application-layer signaling protocol for real-time multimedia network applications, e.g., instant messaging, Voice- over-Internet Protocol (VoIP) and video conference. The Internet Engineering Task Force (IETF) proposed and standardized SIP for session establishment, maintenance, and termination between an association of users (Rosenberg et al. 2002; Johnston et al. 2003). However, since SIP can support name map- ping and redirection services, SIP is also used for handling several kinds of mobility, in which the most famous and fundamental mobility is Internet Pro- tocol (IP) mobility (Vali et al. 2003a, 2003b; Kim et al. 2004). IP mobility concentrates on how to let nodes access the Internet using the same IP address. According to the node type, IP mobility can be divided into (1) host mobility and (2) network mobility. 4.1 SIP-Based Host Mobility Host mobility occurs when a single node changes its original point of attach- ment in the Internet. In other words, as a node roams