Open source CSTA library
Enterprise telephony recording and retrieval system
SIP Video Multiconference Media Server with WebRTC support.
Implement Screen Pop for Avaya PBX
Microscopic AGI framework.
GSM air interface
ss7mon an SS7/SIGTRAN signalling monitor
Go to github.com/vlm/asn1c for the latest version.
TAPI Phone Monitor for Windows
GSM L1-L3 stack with SIP network interfaces