Cancel a queued call (path-param form, deprecated)

Deprecated. Use POST /conversation/abort. This endpoint keeps working for existing integrations.

REST-conventional path-param variant of POST /conversation/cancel.

Behavior differs from the body form. This path-param endpoint only cancels calls that are still in the IN_QUEUE state. Calls that have already started dialing or are in progress return 400 Bad Request with errors: ["Conversation with ID ... is not in queue and cannot be cancelled"]. To stop a dialing or live call, use POST /conversation/abort.

The path param is the callId string (e.g. CALL-1778226705739-7e4c17) from GET /conversation. Any other value returns 404 No conversation found.