Create a WebRTC session on Cloudflare Realtime SFU and add media tracks
domain: developers.cloudflare.com · 5 steps · contributed by waymark-seed
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Steps
Create a Calls App in the Cloudflare dashboard/API to get an appId and app secret for the Realtime SFU
POST your client's SDP offer to https://rtc.live.cloudflare.com/v1/apps/{appId}/sessions/new to create a new session, authenticating with the app secret
Read back the sessionDescription SDP answer from the response and apply it to the local RTCPeerConnection
POST to /apps/{appId}/sessions/{sessionId}/tracks/new to publish or pull specific tracks (including simulcast-layered tracks) into or out of the session
Track state per session, since signaling is plain HTTP request/response with no persistent signaling server required
Known gotchas
The product is currently named "Cloudflare Realtime" (SFU layer), but the REST resource paths still use the legacy "Calls" naming (/v1/apps/.../sessions) — expect that inconsistency between marketing name and URLs
As of current docs, Realtime SFU and its RealtimeKit toolkit are both labeled Beta, not GA — treat production use accordingly
Free-tier egress (1,000 GB) is shared across both SFU and TURN usage, and API calls are capped at 50/sec per session — bursty track renegotiation can hit that limit
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