A Dart SIP user agent stack for building cross-platform VoIP and messaging apps with Flutter and WebRTC.
dart-sip-ua is a Dart implementation of the SIP user agent stack, ported from JsSIP. It enables developers to build cross-platform Flutter applications that support SIP-based audio/video calls and instant messaging over WebSocket or TCP connections. It solves the problem of integrating standardized telephony and real-time communication features into mobile, desktop, and web apps using Flutter and WebRTC.
Flutter developers building cross-platform communication apps, such as VoIP clients, video conferencing tools, or messaging applications that need to interoperate with existing SIP infrastructure.
Developers choose dart-sip-ua because it provides a pure Dart SIP stack with full cross-platform support, seamless integration with flutter-webrtc for media handling, and compatibility with widely-used SIP servers, eliminating the need for platform-specific native SIP libraries.
A dart-lang version of the SIP UA stack.
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Supports iOS, Android, web, macOS, Windows, and Linux from a single codebase, enabling unified development for all major platforms as listed in the README.
Ported from JsSIP, it ensures SIP protocol compliance and works with standard servers like Asterisk and FreeSWITCH, facilitating reliable integration with existing infrastructure.
Directly integrates with flutter-webrtc for audio/video calls, leveraging modern WebRTC standards for real-time media communication as highlighted in the features.
Backed by contributors and sponsors like SureVoIP, with ongoing updates and a Slack channel for support, indicating a sustainable development ecosystem.
Limited to WebSocket and TCP for signaling, with UDP not supported due to complexity, as stated in the FAQ, which may restrict use in certain network setups.
Requires precise DTLS/SRTP and codec matching on SIP servers, leading to issues like '488 Not acceptable here' that demand technical expertise to resolve.
Relies heavily on example projects and brief FAQs, lacking comprehensive guides for advanced features or troubleshooting, which can slow down onboarding.