Jin-Woo Jung Doug Montgomery Jung-Hoon Cheon Hyun-Kook Kahng Mobility Agent with SIP Registrar for VoIP Services. 454-464 2003 conf/human/2003 Human.Society@Internet 2003 http://link.springer.de/link/service/series/0558/bibs/2713/27130454.htm db/conf/human/human2003.html#JungMCK03