IPBX
Asterisk PBX: http://asterisk.org
SIP
SIP Express bideratzailea: http://www.iptel.org/ser
H.323
OpenH323 gatekeeper-a: http://www.openh323.org
GNU gatekeeper-a: http://www.gnugk.org
OpenH323 proxy-a: http://openh323.sourceforge.net
H323 - ISDN atebidea: http://www.telos.de/linux/H323/
Konferentzia/VoIP softwarea
OpenMCU: http://www.openh323.org
Antzeko bezeroak
XTen: http://www.xten.com
SJPhone: http://www.sjlabs.com/
OpenPhone: http://www.openh323.org
Netmeeting: http://www.microsoft.com