Applied Voice and Speech Technologies, Inc. (AVST) offers SIP integrations to its flagship CallXpre...
Commercial software development company that produces PBX, router, proxy and application server sof...
VoIP telephony server software manufacturer. Includes product information, free download trials, an...
A cross-platform SIP server running on Windows and Ubuntu. Detailed documentation.
SIP based VoIP and instant messaging software for office needs.
Products include SIP server and VoIP-server with SIP and H.323 protocols support.
A branch of the SIP Express Router project, offering an open-source SIP server.