The IDs of the files which will be played. These can be a URL to a file, SSML commands using the #ssml[] element, or text using the #tts[] element.
OptionallocaleIf using SSML or TTS, this is a required field. The voice and language you want to use for the text-to-speech message. This can either be defined by the ISO 639 locale and language code or by specifying a particular voice. Supported languages and voices are detailed here.
The name property. Must have the value playFiles.
Plays Interactive Voice Response (IVR) files for the supported locale or SSML commands at the Sinch backend. An IVR message is played only on the caller's side.