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See Voice SDK integration for authentication, platform packages, routing, and preview availability. The SDK calls this after joining and publishing microphone audio. Use Authorization: Bearer <controlToken> from call creation. Permanent API keys and media tokens are not accepted for call control. Returns HTTP 200 with { "success": true }. Repeated activation of an active call is safe. Expired or ended calls, missing microphone publication, and unavailable support return 409. A failed activation ends its reserved call; begin a new call attempt with a new request ID.