VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
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Open source CSTA library
open5g is an open source implementation of the 3GPP 5G specifications.
High performance, production quality STUN server and client library
A Better PBX For Your Business
Enterprise telephony recording and retrieval system
H.323 Gatekeeper for VoIP and videconferencing
SIP softphone
SIP Video Multiconference Media Server with WebRTC support.
Simple and efficient tool for SIP trace filtering
Microscopic AGI framework.
Fast CGI-based AsteriskPBX cluster administration tool.
GNU Telephony Services and Applications