Elastix
FreePBX
AstLinux
AsterixNow
(à compléter)
Voir aussi
Blue.box
Kazoo
FreeSWITCH
http://www.trixbox.org
(beaucoup, à compléter)
Tine
Sugar
Softphones
http://www.cio.com.au/article/327163/5_open_source_voip_softphones_watch
http://microsip.org.ua
http://www.voip-info.org
http://www.voip-info.org/wiki/view/Asterisk
http://www.cio.com.au/article/323016/five_open_source_ip_telephony_projects_watch
http://anders.com/cms/266
http://www.voip-info.org/wiki/view/What+is+VOIP
http://www.ozekiphone.com
http://www.codeproject.com/Articles/665755/How-to-handle-appointments-and-send-automated-remi