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WebRTC connection fails after successful API authentication and SDP negotiation. ICE connection state goes from "checking" to "disconnected" to "failed".

**HeyGen API:** v1 Streaming Avatar API 

  - Endpoint: `POST https://api.heygen.com/v1/streaming.new`

  - ICE servers provided (5 STUN/TURN servers)

  - Remote description set successfully

  - Answer sent to `POST https://api.heygen.com/v1/streaming.start`

  - Response: `{code: 100, message: 'success'}`

    - 2 srflx (server reflexive) candidates

  - Both tracks detected in `ontrack` event

new → checking → disconnected → failed

✅ PeerConnection created with ICE servers: 5 servers

🔧 ICE servers: (5) [{…}, {…}, {…}, {…}, {…}]

📝 Sending initial answer to HeyGen (Trickle ICE)...

HeyGen Streaming Avatar - WebRTC Connection Issue

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