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# June 7, 2026

## Changed

### Call language is now optional — auto-detected from the phone number

`language` on [Make a call](/api-reference/rest-api/calls/make-call) is no longer required. When omitted, Dial detects the language from the phone number's country prefix — the destination number for outbound calls, the caller's number for inbound calls — and the voice agent handles both that language and `en-US`. Pass an explicit `language` to pin the call to a single language, exactly as before.

The CLI's `dial call --language` flag follows the same behavior: omit it to auto-detect.