Speech synthesis markup
You can use speech markup in the telephone channel and in voice assistants:
In bots for calls you can use SSML to mark up the text for synthesis in the Bot says field in the Text-to-speech block.
You can mark up the speech of the voice assistant in the Speech synthesis markup field of the Text block.
? > The markup syntax depends on the voice assistant. For example, Google Assistant supports SSML for speech synthesis markup.