API OverviewSessions & Calls

Delete session

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Delete a session. The request is accepted immediately and session termination is reported by the deferred `session.ended` webhook. **Tip:** This endpoint disconnects a Session whether or not its call has been answered. Use [Reject an incoming call](/api/sessions/reject) for an unanswered inbound call or [Cancel an unanswered outgoing call](/api/sessions/cancel) for an unanswered outbound call; those endpoints return `409 Conflict` after the call is answered. **Triggered webhooks:** `session.ended` (deferred) See [Session lifecycle events](/api/sessions#lifecycle-events) for complete payload schemas and examples.

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

uuidstringRequired

Session identifier.

Headers

Idempotency-KeystringOptionalformat: "^[a-zA-Z0-9._-]+$"<=128 characters
Optional key for safely retrying mutating requests. See [Idempotency](https://voice-platform.docs.buildwithfern.com/idempotency) for details.
Operation-IdstringOptionalformat: "uuid"

optional client-supplied lowercase RFC-4122 v4 UUID returned as operation_uuid; platform generates one when omitted; correlation metadata distinct from Idempotency-Key.

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
500
Internal Server Error
503
Service Unavailable Error