JsSIP

JsSIP is a robust and lightweight JavaScript SIP library that enables real-time communication capabilities in both browser and Node.js environments. It currently maintains version 3.13.6, with a steady release cadence indicating active development and timely updates. The library facilitates SIP over WebSocket (RFC 7118, co-authored by JsSIP's creators), supporting audio/video calls via WebRTC, and instant messaging. Its key differentiators include its dual-environment compatibility, a user-friendly yet powerful API, and demonstrated interoperability with popular SIP servers like Kamailio, Asterisk, and Mobicents. JsSIP provides a flexible foundation for integrating SIP functionality directly into web applications, abstracting the complexities of WebRTC and WebSocket signaling for developers.