API OverviewKeypad (DTMF)

Cancel outbound DTMF sequence

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**Rate limit: Per command** · **Burst:** 20 · **Refill:** 20 req/s Cancel the active outbound DTMF sequence for the session. Before returning `202`, the platform deletes the remaining sequence plan so that it cannot schedule another key or wait action. A key whose transmission has already started might still finish. If no sequence is active, the platform accepts the request without taking further action. The `202` response acknowledges the cancellation request. The platform does not emit a terminal webhook. See [Keypad input lifecycle events](/api/keypad-input#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

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

Cancellation accepted.
operation_uuidstringformat: "uuid"
statusenum

Errors

400
Bad Request Error
401
Unauthorized Error
404
Not Found Error
409
Conflict Error
429
Too Many Requests Error
500
Internal Server Error
503
Service Unavailable Error