...First, some background: Similar to Linux's impact on the operating system market, Asterisk is disrupting the traditionalPBX market--which is filled with legacy, proprietary, expensive telephony platforms..." Complete Story ...
http://linuxtoday.com/news_story.php3?ltsn=2008-05-25-006-26-OS-BZ-NT
...VoIP applications marketplace. Vocalocity gives small and medium-sized businesses the power of a full-featured traditionalPBX with the cost-effectiveness and flexibility of a VoIP hosted solution. Consistent growth and the unique position...
http://www.findwhitepapers.com/whitepaper980/