free or open source VOIP Software

http://en.wikipedia.org/wiki/Comparison_of_VoIP_software

http://en.wikipedia.org/wiki/List_of_SIP_software

 

 

Client on PC

http://ekiga.org/

Fausse home (temporaire)

 

Client on Android:

SipDroid

Fausse home (temporaire)

IMSDroid

Fring

 

Server:

http://www.freeswitch.org/

http://www.asterisk.org/ ==>PBX with call conference

http://www.elastix.org/

MySIPSwitch: http://mysipswitch.codeplex.com/

Home

http://www.opensips.org/