Developer Builds Telnyx Voice Agent That Follows Mid-Call Language Switches Automatically

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A developer has built a voice AI agent on Telnyx that detects and matches a caller's spoken language in real time, including mid-conversation switches, without any language menus or manual routing. The Python Flask application supports five languages — English, Spanish, Portuguese, Hindi, and Mandarin — using a single phone number and one AI Assistant. Speech transcription is handled by Deepgram nova-3 with automatic language detection, while a single ultra-voice model renders replies across all supported languages. The LLM, powered by Telnyx's native Kimi-K2.6 model, follows plain-language instructions to detect and mirror the caller's language on every turn. The project's source code is publicly available on GitHub under the Telnyx code examples repository.

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