Voices

Manage voice configurations and imports from providers (e.g. ElevenLabs). Voices are assigned to agents and determine how the agent sounds on calls. For UUID / phone / datetime formats used below, see Data formats.

List Voices

Returns all voices available to your organization (both system voices and custom/cloned voices).

cURL

curl "https://api.truedy.ai/api/public/v1/voices" \
  -H "Authorization: Bearer YOUR_API_KEY"

Response

data (array of voice objects), meta.

{
  "data": [
    {
      "id": "a7f2ec82-f533-4f41-a8de-0e4351bd2ec5",
      "name": "Support Voice",
      "provider": "elevenlabs",
      "type": "reference",
      "language": "en-US",
      "status": "active",
      "created_at": "2024-01-01T00:00:00Z",
      "updated_at": "2024-01-01T00:00:00Z"
    }
  ],
  "meta": {
    "request_id": "f98eb11f-9f34-4d13-9075-0e29f106f37d",
    "ts": "2024-01-01T00:00:00Z"
  }
}

Get Voice

cURL

curl "https://api.truedy.ai/api/public/v1/voices/a7f2ec82-f533-4f41-a8de-0e4351bd2ec5" \
  -H "Authorization: Bearer YOUR_API_KEY"

Import Voice from Provider

Import an existing voice from ElevenLabs (or another provider) into your organization. Use this when you already have a voice ID from a provider and want to use it with your agents.

Request Body

Field	Type	Required	Description
`name`	string	Yes	Display name for the voice in your dashboard
`provider`	string	No	Voice provider. Default: `elevenlabs`
`provider_voice_id`	string	Yes	The voice ID from your provider (e.g. ElevenLabs voice ID)

Example

{
  "name": "Support Voice",
  "provider": "elevenlabs",
  "provider_voice_id": "21m00Tcm4TlvDq8ikWAM"
}

cURL

curl -X POST "https://api.truedy.ai/api/public/v1/voices" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Support Voice",
    "provider": "elevenlabs",
    "provider_voice_id": "21m00Tcm4TlvDq8ikWAM"
  }'

Response: 201 Created with data (voice object) and meta. May return 422 or 502 if the provider rejects the request (e.g. invalid voice ID or quota exceeded).

Clone Voice from Audio

Create a voice clone from your own audio samples. Upload one or more audio files (base64-encoded), and the system will clone the voice via ElevenLabs and import it to Ultravox for use with agents. Requires credits on your account.

Request Body

Field	Type	Required	Description
`name`	string	Yes	Display name for the cloned voice (max 40 characters)
`files`	object[]	Yes	One or more audio files. Each file is `{ filename, data, content_type }`
`files[].filename`	string	Yes	File name including extension (e.g. `sample.mp3`)
`files[].data`	string	Yes	Base64-encoded audio file content
`files[].content_type`	string	No	MIME type. Default: `audio/mpeg`. Supports: `audio/mpeg`, `audio/wav`, `audio/mp4`, `audio/x-m4a`

Tips for best results:

Use 1–5 minutes of clear, noise-free audio
Avoid music or background noise
MP3 or WAV at 44.1kHz works best

Example

{
  "name": "My Custom Voice",
  "files": [
    {
      "filename": "sample.mp3",
      "data": "<base64-encoded audio bytes>",
      "content_type": "audio/mpeg"
    }
  ]
}

cURL

# Encode your audio file to base64 first:
# base64 -i sample.mp3 > sample_b64.txt

curl -X POST "https://api.truedy.ai/api/public/v1/voices/clone" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "My Custom Voice",
    "files": [
      {
        "filename": "sample.mp3",
        "data": "SUQzBAAAAAAAI1RTU0UAAAAPAAADTGF2ZjU4Ljc2LjEwMAAAAAAAAAAAAAAA...",
        "content_type": "audio/mpeg"
      }
    ]
  }'

Response: 201 Created with data (voice object with status: "active") and meta. The voice is immediately ready for use. Returns 422 if name exceeds 40 characters or no files are provided. Returns 402 if your account lacks sufficient credits.

Update Voice

Update the display name of a voice. The name is passed as a query parameter.

Parameters

Query parameters:

Parameter	Type	Required	Description
`name`	string	Yes	New display name for the voice

cURL

curl -X PATCH "https://api.truedy.ai/api/public/v1/voices/a7f2ec82-f533-4f41-a8de-0e4351bd2ec5?name=Support+Voice+V2" \
  -H "Authorization: Bearer YOUR_API_KEY"

Delete Voice

Deletes the voice from your organization. Agents using this voice will need to be updated.

cURL

curl -X DELETE "https://api.truedy.ai/api/public/v1/voices/a7f2ec82-f533-4f41-a8de-0e4351bd2ec5" \
  -H "Authorization: Bearer YOUR_API_KEY"

Sync Voice

Re-syncs a voice with Ultravox (the underlying AI platform). Use this if a voice shows as inactive or if you encounter sync errors. May return 422 if the sync fails (e.g. provider error).

cURL

curl -X POST "https://api.truedy.ai/api/public/v1/voices/a7f2ec82-f533-4f41-a8de-0e4351bd2ec5/sync" \
  -H "Authorization: Bearer YOUR_API_KEY"

Preview Voice

Generate a short audio preview of the voice speaking a given text. Returns raw WAV audio bytes.

Parameters

Query parameters:

Parameter	Type	Description
`text`	string	Text for the voice to speak. Defaults to a standard greeting if omitted.

cURL

curl "https://api.truedy.ai/api/public/v1/voices/a7f2ec82-f533-4f41-a8de-0e4351bd2ec5/preview?text=Hello%20from%20Truedy" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -o preview.wav

Returns raw WAV audio. May return 422 or 502 if the provider fails.

Voice Object

Field	Type	Description
`id`	UUID	Voice ID
`name`	string	Display name
`provider`	string	Provider: `elevenlabs`, `google`, `azure`, `openai`
`type`	string	`reference` (imported) or `custom` (cloned)
`language`	string	Language code (e.g. `en-US`)
`status`	string	`active`, `training`, or `failed`
`created_at`	datetime	When the voice was added
`updated_at`	datetime	Last updated

API documentation

Endpoints

Voices

Voices

List Voices

cURL

Response

Get Voice

cURL

Import Voice from Provider

Request Body

Example

cURL

Clone Voice from Audio

Request Body

Example

cURL

Update Voice

Parameters

cURL

Delete Voice

cURL

Sync Voice

cURL

Preview Voice

Parameters

cURL

Voice Object

​Voices

​List Voices

​cURL

​Response

​Get Voice

​cURL

​Import Voice from Provider

​Request Body

​Example

​cURL

​Clone Voice from Audio

​Request Body

​Example

​cURL

​Update Voice

​Parameters

​cURL

​Delete Voice

​cURL

​Sync Voice

​cURL

​Preview Voice

​Parameters

​cURL

​Voice Object

Voices

List Voices

cURL

Response

Get Voice

cURL

Import Voice from Provider

Request Body

Example

cURL

Clone Voice from Audio

Request Body

Example

cURL

Update Voice

Parameters

cURL

Delete Voice

cURL

Sync Voice

cURL

Preview Voice

Parameters

cURL

Voice Object