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Telnyx NaturalHD voices sound clearer and more expressive

7, Jul 2025

We updated our NaturalHD text-to-speech voices. The update delivers higher-definition audio and can more naturally handle disfluencies (“um”, “uh”) and laughter with no changes to your API calls or carrier setup. This allows customers to enjoy more human-like conversations.

Key benefits:

  • Clearer audio: Telnyx NaturalHD delivers a noticeably crisper voice profile.
  • More emotion: Refined prosody makes speech feel warmer and more engaged.
  • Authentic quirks: “Um,” “uh,” and light laughter flow naturally without breaking rhythm.

Hear the difference:

Why does it matter?

Lifelike voices keep callers listening and help them trust what they hear. Telnyx NaturalHD’s cleaner sound and conversational tone make menus easier to follow and reduce the urge to hang up.

We have a flexible TTS voice line up. When you need extra language options, Azure Neural HD voices deliver premium clarity on many languages, while standard voices keep routine traffic economical. Switch between Telnyx NaturalHD, Azure Neural HD, and standard voices with a single voice parameter. The mix lets you balance experience and cost on every interaction.

Getting started

Follow these steps to start using Telnyx Natural HD voices.

If you’re using the AI Assistant Builder:

  1. Go to portal, select the AI, Storage and Compute sub-menu, click AI Assistants.
  2. Create a new assistant and choose a voice provider from the dropdown.
    1. If you select AWS, Azure, or ElevenLabs, you will need to select your integration secret.
  3. Use the Voice Playground to preview the voice you have chosen.
  4. Select your Transcription (Text-to-Speech) Model and create.

If you’re using Voice API or TeXML:

  1. Make sure your Voice API or TeXML application is correctly configured.
  2. Pick a voice ID and add your configurations using the TTS guide.
  3. Assign a number to your application, then call the number to verify your TTS setup.
  4. Swap voices or tiers whenever you need. No infrastructure changes or new carrier setups.

For more details visit our developer documentation and start building today.