IPBX
Asterisk PBX: http://asterisk.org
SIP
SIP Express Router: http://www.iptel.org/ser
H.323
OpenH323 Gatekeeper: http://www.openh323.org
GNU Gatekeeper: http://www.gnugk.org
OpenH323 Proxy: http://openh323.sourceforge.net
H323 - ISDN Gateway: http://www.telos.de/linux/H323/
Konferenz-/VoIP-Programme
OpenMCU: http://www.openh323.org
Ähnliche Clients
XTen: http://www.xten.com
SJPhone: http://www.sjlabs.com/
OpenPhone: http://www.openh323.org
Netmeeting: http://www.microsoft.com