> ## Documentation Index
> Fetch the complete documentation index at: https://developers.telnyx.com/llms.txt
> Use this file to discover all available pages before exploring further.

# STT llms.txt

> Machine-readable documentation index for STT (Voice) — guide pages and API endpoints for AI agents and LLMs

# Telnyx Voice: STT — Documentation Index

> STT documentation within the Voice section of the Telnyx developer docs ([https://developers.telnyx.com](https://developers.telnyx.com)).
> Root index: [https://developers.telnyx.com/llms.txt](https://developers.telnyx.com/llms.txt) · Voice index: [https://developers.telnyx.com/development/llms/voice-llms-txt.md](https://developers.telnyx.com/development/llms/voice-llms-txt.md) · Full content for this subsection: [https://developers.telnyx.com/development/llms/voice-stt-llms-full-txt.md](https://developers.telnyx.com/development/llms/voice-stt-llms-full-txt.md)

##

* [Overview](https://developers.telnyx.com/docs/voice/stt/overview.md): Real-time and batch audio transcription via WebSocket, REST, or in-call.
* [Quickstart](https://developers.telnyx.com/docs/voice/stt/getting-started.md): Stream audio to Telnyx Speech-to-Text and see live transcripts in under 5 minutes with this end-to-end Python and JavaScript quickstart.
* [Models](https://developers.telnyx.com/docs/voice/stt/models.md): Compare Telnyx Speech-to-Text engines and models — Deepgram, Whisper, Google, Azure, xAI, AssemblyAI, Speechmatics, Soniox, Parakeet, Reson8 — by accuracy, latency, language coverage, and price.
* [Migration](https://developers.telnyx.com/docs/voice/stt/migration.md): Migrate from Deepgram, AssemblyAI, Google, or other speech-to-text providers to Telnyx STT in minutes by changing only two to three lines of code.

## WebSocket

* [Lifecycle](https://developers.telnyx.com/docs/voice/stt/websocket-streaming.md): How the Telnyx Speech-to-Text WebSocket endpoint works for real-time streaming, including connection, audio frames, transcript messages, and shutdown.
* [Overview](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/parameters.md): Reference for query parameters on the Telnyx Speech-to-Text WebSocket endpoint, including engine, model, language, and redaction options.
* [Audio Formats](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/parameters/audio-formats.md): Supported audio input formats, sample rates, and engine compatibility for the Telnyx Speech-to-Text WebSocket streaming endpoint and binary frames.
* [Engines & Models](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/parameters/engines-and-models.md): Available speech-to-text engines and models on Telnyx — Deepgram, Telnyx native, Google, Azure, xAI, AssemblyAI, Speechmatics, Soniox, Parakeet, Reson8 — selectable via query parameters.
* [End-of-Turn Detection](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/parameters/end-of-turn.md): Flux end-of-turn detection parameters for voice agent turn-taking.
* [Language](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/parameters/language.md): Configure the language for Telnyx Speech-to-Text WebSocket streaming using BCP-47 codes, with per-engine differences in supported languages and behavior.
* [Interim Results](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/parameters/interim-results.md): Enable interim results to receive partial transcripts as audio streams to the Telnyx Speech-to-Text WebSocket endpoint (Deepgram engine only).
* [Endpointing](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/parameters/endpointing.md): Configure silence-based endpointing for utterance boundary detection on the Telnyx Speech-to-Text WebSocket endpoint (Deepgram, xAI, Google, Speechmatics, and Soniox).
* [Keyword Boosting](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/parameters/keyword-boosting.md): Boost recognition of specific terms (keyterm and keywords parameters).
* [Redaction](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/parameters/redaction.md): Automatically redact PII such as numbers, names, and SSNs from Telnyx streaming transcription results using Deepgram redaction parameters.
* [Messages](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/responses.md): Reference for binary audio frames and JSON message types exchanged over the Telnyx Speech-to-Text WebSocket connection in both directions.
* [Errors](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/errors.md): Error codes and troubleshooting tips for the Telnyx Speech-to-Text WebSocket endpoint, including invalid parameters, engine mismatches, and disconnects.
* [Examples](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/examples.md): Complete Python and JavaScript code examples for streaming audio to the Telnyx Speech-to-Text WebSocket API and printing live transcription results.
* [Production Patterns](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/production-patterns.md): Reconnect, backoff, partial handling, buffering, and monitoring patterns for WebSocket STT.
* [Pricing](https://developers.telnyx.com/docs/voice/stt/websocket-streaming/pricing.md): Pricing for Telnyx Speech-to-Text WebSocket streaming. Billed per minute of audio streamed in real time, with model-tier rates and volume discounts.

## REST API

* [Overview](https://developers.telnyx.com/docs/voice/stt/rest-api.md): Transcribe audio files synchronously with the Telnyx Speech-to-Text REST API by uploading a file or providing a public URL and receiving text.
* [Overview](https://developers.telnyx.com/docs/voice/stt/rest-api/parameters.md): Reference of all parameters for the Telnyx Speech-to-Text REST API — audio source, language, model, diarization, punctuation, and response options.
* [Models](https://developers.telnyx.com/docs/voice/stt/rest-api/parameters/models.md): Available speech-to-text models on the Telnyx STT REST API. Compare general, telephony, and specialty models by language, accuracy, and latency.
* [Audio Formats](https://developers.telnyx.com/docs/voice/stt/rest-api/parameters/audio-formats.md): Supported audio formats for the Telnyx Speech-to-Text REST API — WAV, MP3, FLAC, OGG, and more. Includes recommended sample rates and encodings.
* [Model Config](https://developers.telnyx.com/docs/voice/stt/rest-api/parameters/model-config.md): Model configuration options for the Telnyx Speech-to-Text REST API — biasing, hotwords, language hints, and per-request tuning of transcription accuracy.
* [Response Format](https://developers.telnyx.com/docs/voice/stt/rest-api/parameters/response.md): Response format reference for the Telnyx Speech-to-Text REST API — transcript text, words, timestamps, confidence, and per-channel diarization fields.
* [Pricing](https://developers.telnyx.com/docs/voice/stt/rest-api/pricing.md): Pricing for the Telnyx Speech-to-Text REST API. Billed per minute of audio processed, with model-tier rates and volume discounts available on request.

## In-Call

* [In-Call Transcription](https://developers.telnyx.com/docs/voice/stt/in-call-transcription.md): Real-time speech-to-text during live Telnyx voice calls via Voice API or TeXML.

## API Reference (STT)

### Audio

* [Transcribe speech to text](https://developers.telnyx.com/api-reference/audio/transcribe-speech-to-text.md): Transcribe speech to text. This endpoint is consistent with the OpenAI Transcription API and may be used with the OpenAI JS or Python SDK.