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Yes, Text-to-Speech (TTS) works with all Programmable Voice calls. The <Say> TwiML verb, our command for reading TTS scripts, can understand and speak in multiple languages and dialects.
For more details on what languages are supported, please see What Languages can the <Say> TwiML Verb Speak.
For help forming TwiML TTS responses, please see Twilio Docs: TwiML Voice - <Say>.