Unified Communications Server
Java VoIP Softphone (SIP) (replaced by jfPhone)
H.323 Gatekeeper for VoIP and videconferencing
Chat with your friends everywhere, whether you are in space or on eart
Cyber-wrt pbx is embedded system in DD-Wrt router
OpenSource Call Center and Dialer System
Padrão de comunicação VOIP.
A suite of open-source tools and frameworks for creating SIP apps