| Name | Type | Description | Notes |
|---|---|---|---|
| File | string | RL of the audio file to be played to the caller. The URL can be the `recordingUrl` generated from the `RecordUtterance` or `StartRecordCall` PerCL commands or any accessible URL. FreeClimb will respect Cache-Control headers for this file. Use these to limit repeated requests for unchanged audio. If no Cache-Control header is provided, the file will be cached for seven days by default. |