Java wrapper for the popular chat & VOIP service
Java VoIP Softphone (SIP) (replaced by jfPhone)
Java VoIP/SIP PBX system (replaced by jfPBX)
Positional Audio Communication for Minecraft with Mumble
Open source streamlined SIP client built on Linphone
Universal Framework to audit Voip protocols's security
Optimized and cross platform SMPTE 2022 FEC library in C, Python, Java
Send Asterisk CDR to serial device
The OZEKI VoIP Service Checker allows you to check VoIP services.
C++ SIP stack based on Chrome source code