Verizon Communications, BT and China Mobile will be among the carriers participating in the MultiService Forum's Global MultiService Interoperability demonstration in October, the first such demo since 2006. The event may be five months off, but it's an undertaking of major proportions involving lab sites on multiple continents. In the U.S., GMI 2008 participants also will include the university of New Hampshire Interoperability Lab and the Dept. of Homeland Security's National Communication System infrastructure. This year's GMI agenda will include end-to-end IMS testing and IPTV performance management testing, among other tasks.