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You can set a specific language for an agent. The language setting affects three things during a call:
Speech recognition — which language the agent transcribes the caller from.
Voice pronunciation — the language the voice uses to pronounce words and shape its accent.
Agent text — the agent is automatically instructed to respond in the configured language. You do not need to add a “respond in X” instruction to your prompt.
The voice you select is still the primary determinant of accent — the language setting refines pronunciation rules and ensures the right speech recognition model is used.
A single-language agent is the most accurate setup: the agent transcribes in one language only, the voice speaks with that language’s pronunciation, and the agent always responds in that language — no language detection involved.If no language is selected, the agent defaults to English (US).The chosen voice must support the chosen language. The dashboard hides unsupported combinations from the picker, with a tooltip explaining which voice or voice model is blocking it.
For agents that serve callers in different languages, see the multilingual guide.
If you already know the caller’s language at call time (for example, from CRM context or the dialed number), prefer overriding the language per call via the inbound call webhook. This gives you single-language accuracy on each call without limiting which customers the agent can serve.
The language you pick must be supported by both your chosen voice provider (for pronunciation) and at least one speech recognition provider (for transcription). The combinations change as providers add coverage, so the dashboard is the source of truth.On any agent page, open the language picker — the dropdown shows the live set of supported languages and updates as you change the voice provider, voice (and pinned voice model), and ASR provider. The same picker works in both single-language and multiselect modes. Unsupported combinations are greyed out, with a tooltip explaining which selection is blocking each one.Still picking your stack? See the TTS provider comparison and ASR provider comparison for provider-level coverage and trade-offs.For locale variants (for example, British English vs. US English, European Spanish vs. Latin American Spanish), the dashboard’s language picker exposes the specific dialect codes when supported.
