OptionallocaleThe 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 say.
OptionaltextContains the message that will be spoken. Default maximum length is 600 characters. To change this limit, please contact support.
Plays a synthesized text-to-speech message to the end user. The message is provided in the text field.