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

# Azure

> Use the Azure speech-to-text plugin in a Zero Runtime pipeline. Setup and usage in Python.

Azure is a **speech-to-text** plugin. It transcribes the caller's audio into text using
Microsoft Azure's Speech service for the LLM.

## Setup

Set your Azure Speech key in the worker environment. Create a Speech resource and key in the [Azure portal](https://portal.azure.com/):

```bash theme={null}
export AZURE_SPEECH_KEY=<key>
```

## Usage

Import the plugin and pass it to the pipeline's `stt` slot.

```python theme={null}
from zrt.plugins import AzureSTT

stt = AzureSTT()

# Pipeline(stt=stt, ...)
```

## Parameters

| Parameter            | Type        | Default   | Description                                                                                                                                                                                                                                       |
| -------------------- | ----------- | --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `speech_key`         | `str`       | `None`    | Azure Speech resource subscription key. Falls back to the `AZURE_SPEECH_KEY` environment variable when unset.                                                                                                                                     |
| `speech_region`      | `str`       | `None`    | Azure region identifier for the Speech resource (e.g. `"eastus"`, `"westeurope"`, `"southeastasia"`). Falls back to the `AZURE_REGION` environment variable, then `"eastus"`. Must match the region where your Azure Speech resource was created. |
| `language`           | `str`       | `"en-US"` | BCP-47 locale tag for the spoken language. Over 100 locales are supported.                                                                                                                                                                        |
| `sample_rate`        | `int`       | `16000`   | PCM input sample rate in Hz sent to Azure.                                                                                                                                                                                                        |
| `enable_phrase_list` | `bool`      | `False`   | When `True`, the phrases supplied in `phrase_list` are registered as recognition hints to improve accuracy for domain-specific terms.                                                                                                             |
| `phrase_list`        | `list[str]` | `None`    | List of words or phrases to use as recognition hints when `enable_phrase_list` is `True`.                                                                                                                                                         |

Transcribed text passes to the [LLM](/plugins/llm/google) once
[turn detection](/plugins/turn-detection/namo) decides the caller has finished speaking.