... 502 CHAPTER 24. CONFERENCING IN THE IMS domain. The I-CSCF of the terminating domain consults the HSS (7) in order to resolve the PSI (i.e., the conference URI). The HSS provides the I-CSCF ... group, the IMS conferencing service only uses BFCP (specified in RFC 4582 [106]). In the future, as the work in the XCON working group progresses, the IMS conferencing service may use the XCON ... Merging the Internet and the Cellular Worlds Third EditionGonzalo Camarillo and Miguel A. Garc© 2008 John Wiley & Sons, Ltd. ISBN: 978 - 0- 470 - 5166 2- 1500 CHAPTER 24. CONFERENCING IN THE...