R. Venkatesha Prasad Richard Hurni H. S. Jamadagni A Proposal for Distributed Conferencing on SIP Using Conference Servers. 32-45 http://dx.doi.org/10.1007/978-3-540-39404-4_3 2003 conf/mmns/2003 MMNS db/conf/mmns/mmns2003.html#PrasadHJ03