Sulus Voices

Overview

Sulus Voices is the platform's own curated, first-party voice provider — a hand-picked set of high-quality voices pre-optimized for voice AI use, distinct from third-party TTS providers like ElevenLabs or Cartesia. This page covers browsing the Voice Library, an illustrative look at the kind of voice roster available, and how to set a chosen voice on an assistant. For third-party TTS integration, see Custom Voice (TTS); for using a cloned voice from a supported provider, see Custom Voice Cloning; for configuring backup voices, see Voice Fallback Plans.

To browse the voice catalog, open Resources > Voice Library in the Sulus dashboard:

1. Filter the list by Provider to narrow it to Sulus Voices specifically, or search by name
2. Press play on any voice to preview it
3. Click the copy icon on a voice to copy its voice ID
4. Open an assistant, click the edit icon on the Voice card, and either choose a voice directly from the list or paste a copied ID into Custom Voice ID

Sulus Voices spans a range of genders, accents, and personality styles. The table below is illustrative of the kind of roster you'll find in the Voice Library — always confirm the current names, characteristics, and IDs directly in your dashboard's Voice Library, since the exact lineup can change over time.

Once you've found a voice ID, set it on your assistant via the provider and voiceId fields:

{
  "voice": {
    "provider": "sulus",
    "voiceId": "your-voice-id"
  }
}

This can be set at assistant creation or via a PATCH request to an existing assistant, the same as with any other voice provider.

For voices that support it, Sulus Voices offers an opt-in "version 2" upgrade path that delivers higher-quality, more natural-sounding output on the same voice ID. Existing assistants are unaffected unless you explicitly opt in — set the voice's version field to select it:

{
  "voice": {
    "provider": "sulus",
    "voiceId": "your-voice-id",
    "version": 2
  }
}

Not every voice in the library supports the version 2 upgrade; check the Voice Library listing for a given voice to confirm support before switching.

See Custom Voice (TTS) for fully custom, webhook-based TTS integration; Custom Voice Cloning for using a cloned voice from an already-supported provider; and Voice Fallback Plans for configuring backup voices, including from Sulus Voices itself, in case your primary voice provider fails mid-call.