Flush buffered playback
Discard any audio currently buffered for playback from the WebSocket server.
This is the barge-in control: when the user interrupts an AI response,
flush the queued server audio so stale response audio stops before the
WebSocket server sends the new response.
It flushes the server-audio playback
buffer, not the WebSocket connection or inbound user audio. Works on
both a per-call relay and a standalone `ws` session.
A 202 response confirms admission.
Authentication
AuthorizationBearer
Application auth. Send `Authorization: Bearer <app_uuid>:<api_key>` using any active key in the app's collection. See [Authentication](https://voice-platform.docs.buildwithfern.com/api/authentication) for details.
Path parameters
uuid
Session identifier.
Headers
Idempotency-Key
Optional key for safely retrying mutating requests. See [Idempotency](https://voice-platform.docs.buildwithfern.com/idempotency) for details.
Request
This endpoint expects an object.
operation_uuid
Optional command correlation UUID. Reuse it within 10 minutes only when retrying the same pause, resume, or relative-seek admission; reuse for a different command is rejected. It is not a general idempotency key or a resource name.
Response
Command accepted for async execution
operation_uuid
status
already_ended
Optional. Set to true on idempotent terminal commands when the session was already in a terminal state at the time the request was received. Absent otherwise.
Errors
400
Bad Request Error
401
Unauthorized Error
404
Not Found Error
409
Conflict Error
413
Content Too Large Error
415
Unsupported Media Type Error
422
Unprocessable Entity Error
429
Too Many Requests Error
500
Internal Server Error
503
Service Unavailable Error