Open source SIP server widely deployed by carriers and providers. Formerly known as OpenSER
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Sippy B2BUA is a RFC3261-compliant Session Initiation Protocol (SIP) stack and Back-to-back user agent (B2BUA) server software.
Linphone.org mirror for flexisip (git://git.linphone.org/flexisip.git)
Open source SIP server, tracing its roots in OpenSER (presently Kamailio)
Lightweight SIP proxy, location server, and registrar written in Node.js