This C++ library has been designed as a Chrome SIP stack.

Sippet is an open-source SIP User-Agent library, compliant with the IETF RFC 3261 specification. It can be used as a building block for SIP client software for uses such as VoIP, IM, and many other real-time and P2P communication services.

The main target was to enable Javascript applications to use UDP, TCP and TLS transports along WebSocket. Existing SIP solutions for the browser are forced to use the WebSockets API to send/receive SIP messages. But for many service providers, the WebSocket protocol could not be a feasible solution due to scalability, support and other business constraints.

By the way, the stack can be used as a full client-side C++ Stack (full-featured) without Javascript integration.


  • Support to symmetric response routing (RFC 3581). Support to client-initiated connections (RFC 5626).
  • Support to client-initiated connections (RFC 5626).
  • Multiplatform: same platforms supported by Chromium.
  • Parsing of SIP and Tel URIs, compatible with GURL.
  • SOCKS for TCP/TLS/Websockets connections, inherited from system settings.

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BSD License

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Additional Project Details



Intended Audience

Information Technology, Advanced End Users, Developers, Architects

Programming Language

C++, JavaScript, Java