Voice & language

OpenPhn runs the conversation through Gemini Live at the call runtime today. Voice options and language codes are exposed via the API; additional TTS providers (ElevenLabs, Google Cloud TTS) ship in a future release.

List voices

curl https://api.openphn.com/v1/voices \
  -H "Authorization: Bearer sk_live_..."

Each entry includes provider, gender, language, and a preview URL.

Choose a voice on call create

Pass voice_id (and optionally voice_engine, language) on POST /v1/calls:

{
  "to": "+14155551234",
  "objective": "...",
  "outcome_schema": { ... },
  "consent_type": "prior_express",
  "voice_id":     "puck",
  "voice_engine": "gemini_25",
  "language":     "en-US"
}

• voice_engine — gemini_25 (default) or gemini_31.
• language — BCP-47 (en-US, es-US, fr-FR, etc.) passed through to Gemini Live.