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Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms
The RTPproxy is a high-performance software proxy for RTP streams that can work together with Sippy B2BUA, Kamailio, OpenSIPS and SER.
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.
Sofia-SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification.
freeswitch event socket base on netty 4 and has some new features.
FreeSWITCH G.729 module using the opensource bcg729 implementation by Belledonne Communications
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.