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.
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