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Platform voices are Retell’s curated voice library, fine-tuned specifically for conversational AI over the phone. They handle fillers, pacing, and conversational rhythm well, and are calibrated for clarity at telecom bitrates. When using a platform voice, fallback is handled automatically to maintain the same voice experience — you do not need to configure a TTS fallback plan in Security & Fallback Settings.
If you are using a non-platform voice, you will need to configure TTS fallback manually.

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Select a platform voice

Platform voices are available in the voice selector in your agent settings. You can preview each voice directly in the dashboard before selecting.

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Custom voice cloning

You can clone your own voice as a platform voice by setting voice_provider to platform when calling the Clone Voice API. The cloned voice will behave the same as a built-in platform voice — fallback is handled automatically and you do not need to configure TTS fallback separately.