open5g is an open source implementation of the 3GPP 5G specifications.
Java VoIP Softphone (SIP) (replaced by jfPhone)
Frontend for ModemManager 0.6/0.7, Wader and oFono
Free software and hardware for telephony
VoIP/SIP Autodialer
Linux operating system source distributions for the CAS product suite.
Blocks unwanted calls using caller ID and a modem
Accent interfaces and controls systems through goals and policies
Enterprise telephony recording and retrieval system
H.323 Gatekeeper for VoIP and videconferencing
Asterisk and kannel integration
SIP softphone
http://www.vaakpbx.com
A Discord BOT using Discord.js
SIP Video Multiconference Media Server with WebRTC support.