Open-source real-time communications
One call.
Every layer.
A family of focused building blocks for creating reliable, high-performance voice systems—from embedded endpoints to real-time AI.
The coreB2BUABack-to-back user agent
RReliability
Sippy B2BUA
A resilient, RFC 3261-compliant SIP stack and call controller.
PPerformance
Go B2BUA
A lean, multicore Go implementation built for high call volumes.
AIAI
Infernos
Real-time multimodal inference for voice and human interaction.
MMedia
RTPProxy
High-performance RTP relay, recording, encryption and media services.
WWebRTC
WebRTC Phone
A browser-to-SIP reference stack built on B2BUA and RTPProxy.
AAutomation
VoIPtests
Continuous interoperability testing across open SIP components.
CRCall recording
Sippy SRS
A compact SIP recording server for capture and processing workflows.
EEmbedded
MicroSippy
Tiny SIP and RTP building blocks for embedded and high-speed systems.