About Us
Hangzhou Freewind Technology Co., Ltd. was founded in 2014 in Hangzhou, China, and is certified as a National High-Tech Enterprise. We build SRTC — a real-time audio/video engine with our own SFU and SDKs for every major platform — and STMLink, the video conferencing system built on it. Our focus is helping organizations run real-time communications on infrastructure they own, connected to their existing devices, business systems and AI models.
Our customers include broadcasters, telecom operators, major sporting events, and organizations in government, banking, public procurement, energy and security. Their requirements shaped SRTC: fully offline self-hosting, interop with SIP / H.323 / GB28181 equipment, and calls that survive bad networks.
At a glance
What we focus on
Self-hosted real-time media
Our own SFU and client SDKs; the whole system can run offline inside your network.
Unified communications
SIP / H.323 room systems, CCTV and third-party meetings in the same session as WebRTC clients.
Real-time AI
AI agents join live calls as participants for voice conversation, transcription and meeting minutes.