"Some critics dismiss Asterisk as a 'toy.' The open source VoIP
platform, skeptics say, lacks a service and support network for big
enterprise and university deployments. Apparently, the folks at
Digium are aware of their critics. The Asterisk market leader has
launched a new warranty program that could give skeptical partners
and customers more faith in the open source PBX.
"Specifically, Digium has launched the Exceptional Satisfaction
Program (ESP), which empowers resellers and partners to offer
Asterisk customers a range of product guarantees..."