-- for proceedings -- Kundan N. Singh received a B.E.(Hons) degree in Computer Science from Birla Institute of Technology and Science in India, M.S. in Computer Science from Columbia University, and is continuing his studies towards Ph.D. degree in the same field at Columbia University in New York City. As a research assistant in the Internet Real-Time Lab at Columbia University, he is doing research on Internet telephony, SIP-H.323 signaling gateway, unified messaging systems and multimedia conferencing. -- for internal talks -- Kundan N. Singh is a Ph.D. student in the Computer Science Department at Columbia University. He is working with Prof. Henning Schulzrinne in the area of Internet telephony, specifically in SIP-H.323 signaling gateway, unified messaging system and multimedia conferencing.