B2BUA.orgGitHub

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.

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.

AIAI

Infernos

Real-time multimodal inference for voice and human interaction.

MMedia

RTPProxy

High-performance RTP relay, recording, encryption and media services.

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.

EEmbedded

MicroSippy

Tiny SIP and RTP building blocks for embedded and high-speed systems.