sox_ng is another Swiss Army Knife of sound processing utilities. It can convert audio files to other popular audio file types and also apply sound effects and filters during the conversion
A complete, cross-platform solution to record, convert and stream audio and video.
An Eclipse Paho C client library for MQTT for Windows, Linux and MacOS. API documentation: https://eclipse-paho.github.io/paho.mqtt.c/
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware.
An out-of-the-box solution to quickly build enterprise-level applications based on Arco Design.
OpenSIPS is a GPL implementation of a multi-functionality SIP Server that targets to deliver a high-level technical solution to be used in professional SIP server platforms.
SpanDSP is a low-level signal processing library that modulates and demodulates signals commonly used in telephony, such as the "noise" generated by a fax modem or DTMF touchpad.
freeswitch event socket base on netty 4 and has some new features.
GLib based Interactive Connectivity Establishment (ICE) implementation (RFC 5245)
