Voice Platform APIRecording

Mask (pause writing) the active recording

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**Rate limit: Per command** · **Burst:** 20 · **Refill:** 20 req/s Shares the `seek` bucket. Temporarily stop writing audio into the active recording (e.g. to redact a card-number segment). The recording stays running; only the masked window is omitted. Resume with `recording/unmask`. Requires an active recording on the session; returns `409 Conflict` if none is in progress (the call is unaffected). **Triggered webhooks:** - `command.recording.mask.accepted` (immediate; carries this response's `operation_uuid`)

Authentication

AuthorizationBearer
Application auth. Send `Authorization: Bearer <app_uuid>:<api_key>`. See [Authentication](https://voice-platform.docs.buildwithfern.com/api/authentication) for details.

Path parameters

uuidstringRequired

Session UUID (format {5-char-prefix}-{uuid}).

Headers

Idempotency-KeystringOptionalformat: "^[a-zA-Z0-9._-]+$"<=128 characters
Optional client-generated key for a mutating endpoint. It identifies one method, route, query, content type, and exact raw body within the authenticated app. Reusing it for a different request returns 422. While its record exists, a retry replays the original accepted response when available. Keys are valid for 1 hour. Allowed characters: letters, digits, dot, hyphen, underscore; max 128 characters. See the Idempotency guide.

Request

This endpoint expects an object.
operation_uuidstringOptionalformat: "uuid"

Optional caller-supplied per-command correlation id, a bare lowercase RFC-4122 v4 UUID (no prefix). Echoed back as operation_uuid in the 202 ack. A later lifecycle webhook carries it only when the gateway can unambiguously associate that event with this command; the field is correlation, not proof of causation. When omitted, the gateway mints one. Not an idempotency key — request deduplication is the Idempotency-Key header. Invalid input (not a v4 UUID) is rejected with 400 invalid_request.

Response

Command accepted for async execution
operation_uuidstringformat: "uuid"
statusenum
already_endedtrueOptional

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