The story
Founded in Lakewood, Colorado, US, in 1989, ACT received funding in 2005 from Dolphin Direct, a New York–based private equity fund.
Encyclopedia.com notes that ACT acquired Proximity, Inc., one of the world's largest providers of room-based videoconferencing services, in early 2002.
On September 4, 2013, ACT was acquired by Atlanta, Georgia-based PGi, a global leader in collaboration and virtual meetings.
From Wikipedia’s article on ACT Conferencing, shared under CC BY-SA 4.0.3