Azure AI Voicelive Py

MicrosoftOfficialCreated by Microsoft

Skill
Tool integration
Software development
MIT
Low risk

From the author

Build real-time voice AI applications using Azure AI Voice Live SDK (azure-ai-voicelive). Use this skill when creating Python applications that need real-time bidirectional audio communication with Azure AI, including voice assistants, voice-enabled chatbots, real-time speech-to-speech translation, voice-driven avatars, or any WebSocket-based audio streaming with AI models. Supports Server VAD (Voice Activity Detection), turn-based conversation, function calling, MCP tools, avatar integration, and transcription.

— the description by Microsoft

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

The azure-ai-voicelive-py skill provides a Python SDK to facilitate bidirectional WebSocket communication with Azure AI models. It enables developers to integrate voice capabilities into applications, supporting features such as voice assistants, chatbots, speech-to-speech translation, and voice-driven avatars. The SDK includes tools for managing audio buffers, configuring session parameters, handling function calls, and processing real-time events.

What it does

Establishes bidirectional WebSocket connections for audio streaming.
Supports Server VAD and manual turn-based conversation control.
Enables function calling and integration with MCP tools.
Provides mechanisms for real-time transcription and audio output.
Offers configuration for various voice models and audio formats.
Facilitates integration with voice-driven avatars.

When to use it

When building Python applications that require real-time voice interaction.
When implementing voice-enabled chatbots or virtual assistants.
When developing systems requiring speech-to-speech translation.
When integrating voice-driven avatars into software projects.

Advantages

Native support for asynchronous Python patterns.
Flexible authentication options including Entra ID integration.
Comprehensive event handling for session and audio management.
Granular control over audio input and output buffers.

Usage examples

“How do I initialize a connection to the Azure AI Voice Live service?”: The user receives a code snippet demonstrating the use of the connect() function within an async context manager, including the required endpoint and credential configuration.
“Show me how to configure a voice assistant with a custom function tool.”: The user receives an example of using the session.update() method to define a FunctionTool, including its name, description, and parameter schema.

Install

Download the skill as a ZIP:
https://mp-staging.autogineer.com/agent-skills/microsoft/azure-ai-voicelive-py/download

Unzip it into the cross-client skills folder of your project:

mkdir -p .agents/skills && unzip azure-ai-voicelive-py.zip -d .agents/skills

Documentation by Microsoft

Azure AI Voice Live SDK

Build real-time voice AI applications with bidirectional WebSocket communication.

Installation

pip install azure-ai-voicelive aiohttp azure-identity

Environment Variables

AZURE_COGNITIVE_SERVICES_ENDPOINT=https://<region>.api.cognitive.microsoft.com  # Required for all auth methods
AZURE_TOKEN_CREDENTIALS=prod # Required only if DefaultAzureCredential is used in production
AZURE_COGNITIVE_SERVICES_KEY=<api-key>  # Only required for the legacy API-key auth path below

Authentication & Lifecycle

🔑 Two rules apply to every code sample below:
Prefer DefaultAzureCredential. It works locally (Azure CLI / VS Code / Developer CLI) and in Azure (managed identity, workload identity) with no code change. Avoid connection strings, account/API keys — they bypass Entra audit and rotation.
Local dev: DefaultAzureCredential works as-is.
Production: set AZURE_TOKEN_CREDENTIALS=prod (or AZURE_TOKEN_CREDENTIALS=<specific_credential>) to constrain the credential chain to production-safe credentials.
Wrap every client in a context manager so HTTP transports, sockets, and token caches are released deterministically:
Sync: with <Client>(...) as client:
Async: async with <Client>(...) as client: and async with DefaultAzureCredential() as credential: (from azure.identity.aio)
Snippets may abbreviate this setup, but production code should always follow both rules.

import os
from azure.ai.voicelive.aio import connect
from azure.identity.aio import DefaultAzureCredential, ManagedIdentityCredential

# Local dev: DefaultAzureCredential. Production: set AZURE_TOKEN_CREDENTIALS=prod or AZURE_TOKEN_CREDENTIALS=<specific_credential>
# Or use a specific credential directly in production:
# See https://learn.microsoft.com/python/api/overview/azure/identity-readme?view=azure-python#credential-classes
# credential = ManagedIdentityCredential()

async with DefaultAzureCredential(require_envvar=True) as credential:
    async with connect(
        endpoint=os.environ["AZURE_COGNITIVE_SERVICES_ENDPOINT"],
        credential=credential,
        model="gpt-4o-realtime-preview",
        credential_scopes=["https://cognitiveservices.azure.com/.default"]
    ) as conn:
        ...

Legacy: API Key (existing keyed deployments)

New code should use DefaultAzureCredential above. Use AzureKeyCredential only if you have an existing keyed deployment that hasn't been migrated to Entra ID yet — for example, regulated environments still completing their Entra rollout.

import os
from azure.core.credentials import AzureKeyCredential
from azure.ai.voicelive.aio import connect

async with connect(
    endpoint=os.environ["AZURE_COGNITIVE_SERVICES_ENDPOINT"],
    credential=AzureKeyCredential(os.environ["AZURE_COGNITIVE_SERVICES_KEY"]),
    model="gpt-4o-realtime-preview",
) as conn:
    ...

Quick Start

import asyncio
import os
from azure.ai.voicelive.aio import connect
from azure.identity.aio import DefaultAzureCredential

async def main():
    async with connect(
        endpoint=os.environ["AZURE_COGNITIVE_SERVICES_ENDPOINT"],
        credential=DefaultAzureCredential(),
        model="gpt-4o-realtime-preview",
        credential_scopes=["https://cognitiveservices.azure.com/.default"]
    ) as conn:
        # Update session with instructions
        await conn.session.update(session={
            "instructions": "You are a helpful assistant.",
            "modalities": ["text", "audio"],
            "voice": "alloy"
        })
        
        # Listen for events
        async for event in conn:
            print(f"Event: {event.type}")
            if event.type == "response.audio_transcript.done":
                print(f"Transcript: {event.transcript}")
            elif event.type == "response.done":
                break

asyncio.run(main())

Core Architecture

Connection Resources

The VoiceLiveConnection exposes these resources:

Resource	Purpose	Key Methods
`conn.session`	Session configuration	`update(session=...)`
`conn.response`	Model responses	`create()`, `cancel()`
`conn.input_audio_buffer`	Audio input	`append()`, `commit()`, `clear()`
`conn.output_audio_buffer`	Audio output	`clear()`
`conn.conversation`	Conversation state	`item.create()`, `item.delete()`, `item.truncate()`
`conn.transcription_session`	Transcription config	`update(session=...)`

Session Configuration

from azure.ai.voicelive.models import RequestSession, FunctionTool

await conn.session.update(session=RequestSession(
    instructions="You are a helpful voice assistant.",
    modalities=["text", "audio"],
    voice="alloy",  # or "echo", "shimmer", "sage", etc.
    input_audio_format="pcm16",
    output_audio_format="pcm16",
    turn_detection={
        "type": "server_vad",
        "threshold": 0.5,
        "prefix_padding_ms": 300,
        "silence_duration_ms": 500
    },
    tools=[
        FunctionTool(
            type="function",
            name="get_weather",
            description="Get current weather",
            parameters={
                "type": "object",
                "properties": {
                    "location": {"type": "string"}
                },
                "required": ["location"]
            }
        )
    ]
))

Audio Streaming

Send Audio (Base64 PCM16)

import base64

# Read audio chunk (16-bit PCM, 24kHz mono)
audio_chunk = await read_audio_from_microphone()
b64_audio = base64.b64encode(audio_chunk).decode()

await conn.input_audio_buffer.append(audio=b64_audio)

Receive Audio

async for event in conn:
    if event.type == "response.audio.delta":
        audio_bytes = base64.b64decode(event.delta)
        await play_audio(audio_bytes)
    elif event.type == "response.audio.done":
        print("Audio complete")

Event Handling

async for event in conn:
    match event.type:
        # Session events
        case "session.created":
            print(f"Session: {event.session}")
        case "session.updated":
            print("Session updated")
        
        # Audio input events
        case "input_audio_buffer.speech_started":
            print(f"Speech started at {event.audio_start_ms}ms")
        case "input_audio_buffer.speech_stopped":
            print(f"Speech stopped at {event.audio_end_ms}ms")
        
        # Transcription events
        case "conversation.item.input_audio_transcription.completed":
            print(f"User said: {event.transcript}")
        case "conversation.item.input_audio_transcription.delta":
            print(f"Partial: {event.delta}")
        
        # Response events
        case "response.created":
            print(f"Response started: {event.response.id}")
        case "response.audio_transcript.delta":
            print(event.delta, end="", flush=True)
        case "response.audio.delta":
            audio = base64.b64decode(event.delta)
        case "response.done":
            print(f"Response complete: {event.response.status}")
        
        # Function calls
        case "response.function_call_arguments.done":
            result = handle_function(event.name, event.arguments)
            await conn.conversation.item.create(item={
                "type": "function_call_output",
                "call_id": event.call_id,
                "output": json.dumps(result)
            })
            await conn.response.create()
        
        # Errors
        case "error":
            print(f"Error: {event.error.message}")

Common Patterns

Manual Turn Mode (No VAD)

await conn.session.update(session={"turn_detection": None})

# Manually control turns
await conn.input_audio_buffer.append(audio=b64_audio)
await conn.input_audio_buffer.commit()  # End of user turn
await conn.response.create()  # Trigger response

Interrupt Handling

async for event in conn:
    if event.type == "input_audio_buffer.speech_started":
        # User interrupted - cancel current response
        await conn.response.cancel()
        await conn.output_audio_buffer.clear()

Conversation History

# Add system message
await conn.conversation.item.create(item={
    "type": "message",
    "role": "system",
    "content": [{"type": "input_text", "text": "Be concise."}]
})

# Add user message
await conn.conversation.item.create(item={
    "type": "message",
    "role": "user", 
    "content": [{"type": "input_text", "text": "Hello!"}]
})

await conn.response.create()

Voice Options

Voice	Description
`alloy`	Neutral, balanced
`echo`	Warm, conversational
`shimmer`	Clear, professional
`sage`	Calm, authoritative
`coral`	Friendly, upbeat
`ash`	Deep, measured
`ballad`	Expressive
`verse`	Storytelling

Azure voices: Use AzureStandardVoice, AzureCustomVoice, or AzurePersonalVoice models.

Audio Formats

Format	Sample Rate	Use Case
`pcm16`	24kHz	Default, high quality
`pcm16-8000hz`	8kHz	Telephony
`pcm16-16000hz`	16kHz	Voice assistants
`g711_ulaw`	8kHz	Telephony (US)
`g711_alaw`	8kHz	Telephony (EU)

Turn Detection Options

# Server VAD (default)
{"type": "server_vad", "threshold": 0.5, "silence_duration_ms": 500}

# Azure Semantic VAD (smarter detection)
{"type": "azure_semantic_vad"}
{"type": "azure_semantic_vad_en"}  # English optimized
{"type": "azure_semantic_vad_multilingual"}

Error Handling

from azure.ai.voicelive.aio import ConnectionError, ConnectionClosed

try:
    async with connect(...) as conn:
        async for event in conn:
            if event.type == "error":
                print(f"API Error: {event.error.code} - {event.error.message}")
except ConnectionClosed as e:
    print(f"Connection closed: {e.code} - {e.reason}")
except ConnectionError as e:
    print(f"Connection error: {e}")

Best Practices

This SDK is async-only; use the .aio namespace throughout. Do not try to pair it with sync clients from other Azure SDKs in the same call path — keep the whole request path async.
Always use context managers for clients and async credentials. Wrap every connection in async with connect(...) as conn:. For async DefaultAzureCredential from azure.identity.aio, also use async with credential: so tokens and transports are cleaned up.

References

Detailed API Reference: See references/api-reference.md
Complete Examples: See references/examples.md
All Models & Types: See references/models.md

Files

ATTRIBUTION.mdAdded by AutoGineer974 B
LICENSELicence file added by AutoGineer1.1 KiB
SKILL.md11.3 KiB
references/api-reference.md8.7 KiB
references/examples.md16.9 KiB
references/models.md18.0 KiB

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Needs an API key, Needs Python

Security

What our scanner noticed· Low risk

Instructions that use the network

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Created by

Microsoft

Publisher

Microsoft (Official)

Source

microsoft/skills · .github/plugins/azure-sdk-python/skills/azure-ai-voicelive-py · commit 0696600

Licence

MIT License (redistribution allowed)

LICENSE (added by AutoGineer from LICENSE)
ATTRIBUTION.md (written by AutoGineer)

Synced

2026-11-08

AutoGineer is not affiliated with or endorsed by Microsoft.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download azure-ai-voicelive-py.zip