with seamless handoff, FMC (fixed-mobile convergence), and heterogeneous roaming via MIMO (multiple input/multiple output) smart antennas leading to software-defined radio (SDR) and cognitive radio-leverage geolocation and portable GPS/GIS. Such advan- ced sensing enables ubicomp and ambient intelligence, including an awareness of user status and availability, and articulated models of privacy, like nar- rowcasting, which allow users to distribute their attention, availability, and virtual presence. Multipresence and persistent channels, encouraged by ABC (always best connected) networks, will extend the way people communicate. Acknowledgements This research has been sponsored in part by grants from Kyushu University Research Superstar Program and the Japan Science and Technology Foun- dation. We also thank Dialogic/Cantata and BEA for providing media and application servers for our experiments. References [1] Koskelainen, P., H. Schulzrinne, and X. Wu. 2002. A SIP-based con- ference control framework. In Proc. NOSSDAV: 12th Int. Wkshp. on Network and Operating Systems Support for Digital Audio and Video 53-61. New York, NY: ACM Press. [2] Dommel, H.-P., and J. Garcia-Luna-Aceves. 1995. Floor control for activity coordination in networked multimedia applications. In Proc. APCC: 2nd Asian-Pacific Conference on Communications. June, Osaka, Japan. [3] Even, R., and N. Ismail. 2006. RFC 4825-Conferencing Scenarios. July. [4] Spinello, R. A. 2004. Cyberethics Morality and Law in Cyberspace. Jones and Bartlett Publishers, Sudbury. [5] Berc, L., H. Gajewska, and M. Manasse. 1995. Pssst: Side conversations in the argo telecollaboration system. In Proc. UIST: 8th Annual ACM C 2009 by Taylor & Francis Group, LLC SIP Handbook: Services, Technologies, and Security Symposium on User Interface and Software Technology 155-56. Novem- ber, New York, NY: ACM Press. [6] Yankelovich, N., J. McGinn, M. Wessler, J. Kaplan, J. Provino, and H. Fox. 2005. Private communications in public meetings. In Proc. CHI: Human Factors in Computing