When a body of independent auditors and experts recommended that the State of California consider open-source software and Voice over Internet Protocol telephony (VoIP) as two measures to cut costs in 2004, that was the signal that open source and VoIP should unite. After all, what’s better than free software? Open source is better, because you have access to the code. What’s better than open source? Open source that’s focused on VoIP. That’s what you get here — 74 open source apps tucked into categories that you can use “as is” or change to fit your specific VoIP needs.
The following apps and resources are categorized by SIP, H.323, IAX, and RTP protocols and include clients, libraries, gatekeepers, and any other open source resource available for those specific protocols plus PBX and IVR platforms. You’ll also find tools like faxware, voicemail apps, and middleware that applies to one or more of the previously mentioned protocols.