Why architecture matters here

WebRTC fails on NAT + firewall + TURN capacity. Architecture matters because signaling + ICE + media + codec compose.

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The architecture: every piece explained

The top strip is setup. Signaling. ICE candidates. STUN. TURN.

The middle row is security + media. DTLS. SRTP. SCTP DataChannel. Codec negotiate.

The lower rows are ops. Media server. Metrics. Ops — network + TURN sizing + observability.

WebRTC bidi — ICE + STUN + TURN + DTLS + SRTPpeer-to-peer real-time mediaSignalingSDP offer/answerICE candidatesgatherSTUNNAT probeTURNrelay fallbackDTLSencrypt handshakeSRTPmedia cryptoSCTP DataChannelreliable/unreliableCodec negotiateVP8/9/H264/OpusMedia serverSFU / MCUMetricsjitter + RTT + lossOps — network + TURN sizing + observabilityencryptmediadatacodecfanoutwatchwatchoperateoperate
WebRTC bidi: signaling, ICE, DTLS/SRTP.
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End-to-end flow

End-to-end: A creates SDP offer, sends via signaling. B answers. ICE gathers candidates. STUN probes work — direct path. DTLS handshake. SRTP media flows both ways.