# Azure Speech

> Expert knowledge for Azure Speech in Foundry Tools development including troubleshooting, best practices, decision making, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when building STT/TTS containers, custom voices, avatars/visemes, telephony/agents, or batch synthesis workflows, and other Azure Speech in Foundry Tools related development tasks. Not for Azure Content Understanding in Foundry Tools (use azure-content-understanding), Azure AI Language (use azure-language-service), Azure Translator (use azure-translator), Azure AI Bot Service (use azure-bot-service).

- Skill: `microsoftdocs/azure-speech` (Agent Skill)
- Install (CLI): `npx skillmds@latest add microsoftdocs/azure-speech`
- Raw SKILL.md: https://api.skillmd.com/api/skills/microsoftdocs/azure-speech/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: DevOps & Infra
- Author: microsoftdocs (https://skillmd.com/u/microsoftdocs)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/microsoftdocs/azure-speech

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# Azure Speech in Foundry Tools Skill

This skill provides expert guidance for Azure Speech in Foundry Tools. Covers troubleshooting, best practices, decision making, limits & quotas, security, configuration, integrations & coding patterns, and deployment. It combines local quick-reference content with remote documentation fetching capabilities.

## How to Use This Skill

> **IMPORTANT for Agent**: Use the **Category Index** below to locate relevant sections. For categories with line ranges (e.g., `L35-L120`), use `read_file` with the specified lines. For categories with file links (e.g., `[security.md](security.md)`), use `read_file` on the linked reference file

> **IMPORTANT for Agent**: If `metadata.generated_at` is more than 3 months old, suggest the user pull the latest version from the repository. If `mcp_microsoftdocs` tools are not available, suggest the user install it: [Installation Guide](https://github.com/MicrosoftDocs/mcp/blob/main/README.md)

This skill requires **network access** to fetch documentation content:
- **Preferred**: Use `mcp_microsoftdocs:microsoft_docs_fetch` with query string `from=learn-agent-skill`. Returns Markdown.
- **Fallback**: Use `fetch_webpage` with query string `from=learn-agent-skill&accept=text/markdown`. Returns Markdown.

## Category Index

| Category | Lines | Description |
|----------|-------|-------------|
| Troubleshooting | L36-L45 | Diagnosing and fixing common Azure Speech issues across TTS, STT, SDK, containers, CRL compatibility, and retrieving session/transcription IDs for support. |
| Best Practices | L46-L61 | Guidance on preparing audio/video data, improving transcription and synthesis quality/latency, designing microphones, managing SDK memory, handling live voice chats, and backing up custom voice resources. |
| Decision Making | L62-L74 | Guides for choosing Azure Speech/Embedded/Voice Live options, checking language/voice availability, and step-by-step migrations between Speech/voice REST APIs and legacy features. |
| Limits & Quotas | L75-L82 | Managing Azure Speech model lifecycles, deployments, regions, and quotas, including language/voice availability, pro voice training/deployment, and service limits. |
| Security | L83-L96 | Securing Azure AI Speech: auth (Entra, RBAC), network isolation (VNet, Private Link, sovereign clouds), encryption/BYOK, BYOS storage, and consent/ID workflows for personal and professional voice. |
| Configuration | L97-L132 | Configuring Azure Speech/Voice Live behavior: audio inputs, logging, containers, SSML, pronunciation, avatars/visemes, batch/real-time TTS/STT, endpoints, and diagnostic/tracing options. |
| Integrations & Coding Patterns | L133-L160 | Patterns and APIs for integrating Azure Speech and Voice Live: telephony, REST/SDK usage, TTS/avatars, translation, transcription (incl. LLM), custom models, agents, WebSockets, and automation. |
| Deployment | L161-L171 | Deploying and scaling Azure AI Speech: Docker/Kubernetes containers, on-prem STT/TTS, custom speech models/endpoints, language ID, and batch/long-form synthesis workflows. |

### Troubleshooting
| Topic | URL |
|-------|-----|
| Resolve common Azure Speech text-to-speech issues | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/faq-tts |
| Retrieve Speech to text session and transcription IDs for support | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-get-speech-session-id |
| Resolve common Azure Speech in Foundry issues | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/known-issues |
| Resolve Azure AI Speech SDK CRL compatibility issues | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/migrate-to-sdk-1-48-2 |
| Troubleshoot Azure Speech containers deployment issues | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-faq |
| Diagnose and fix common Azure Speech SDK issues | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/troubleshooting |

### Best Practices
| Topic | URL |
|-------|-----|
| Prepare and locate audio data for batch transcription | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/batch-transcription-audio-data |
| Create high-quality human-labeled speech transcriptions | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-custom-speech-human-labeled-transcriptions |
| Prepare training data for professional custom voice | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-custom-voice-training-data |
| Apply best practices to reduce Speech synthesis latency | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-lower-speech-synthesis-latency |
| Track and manage Azure Speech SDK memory usage | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-track-speech-sdk-memory-usage |
| Handle interrupted responses in Voice Live chat history | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-voice-live-auto-truncation |
| Use phrase lists to improve Azure Speech accuracy | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/improve-accuracy-phrase-list |
| Apply keyword recognition design and accuracy guidelines | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/keyword-recognition-guidelines |
| Record high-quality samples for custom voice training | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/record-custom-voice-samples |
| Back up and recover custom Speech and Voice resources | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/resiliency-and-recovery-plan |
| Design microphone arrays optimized for Speech SDK | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-sdk-microphone |
| Prepare high-quality video samples for custom avatars | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/text-to-speech-avatar/custom-avatar-record-video-samples |

### Decision Making
| Topic | URL |
|-------|-----|
| Evaluate custom voice lite before professional voice | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/custom-neural-voice-lite |
| Evaluate device suitability for embedded speech models | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/embedded-speech-performance-evaluations |
| Migrate Speech to text REST API from v3.2 to 2024-11-15 | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/migrate-2024-11-15 |
| Migrate Speech to text REST API 2024-11-15 to 2025-10-15 | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/migrate-2025-10-15 |
| Migrate from retired Speech intent recognition to Language or OpenAI | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/migrate-intent-recognition |
| Migrate from Long Audio API to Batch synthesis | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/migrate-to-batch-synthesis |
| Migrate from v3 text-to-speech to custom voice REST API | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/migrate-to-custom-voice-api |
| Migrate Speech-to-text REST from v3.0 to v3.1 | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/migrate-v3-0-to-v3-1 |
| Migrate Speech to text REST API v3.1 to v3.2 | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/migrate-v3-1-to-v3-2 |

### Limits & Quotas
| Topic | URL |
|-------|-----|
| Manage custom speech model and endpoint lifecycle | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-custom-speech-model-and-endpoint-lifecycle |
| Check Azure Speech language and voice availability | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/language-support |
| Deploy professional voice models to custom endpoints | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/professional-voice-deploy-endpoint |
| Reference quotas and limits for Azure Speech | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-services-quotas-and-limits |

### Security
| Topic | URL |
|-------|-----|
| Configure BYOS storage for Azure Speech resources | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/bring-your-own-storage-speech-resource |
| Configure Microsoft Entra auth for Azure AI Speech | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-configure-azure-ad-auth |
| Configure consent requirements for personal voice projects | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/personal-voice-create-consent |
| Create personal voice projects with consent and IDs | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/personal-voice-create-project |
| Add and manage voice talent consent for professional voice | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/professional-voice-create-consent |
| Assign Azure RBAC roles for Speech resources | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/role-based-access-control |
| Configure Speech service in Azure sovereign clouds | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/sovereign-clouds |
| Manage Speech service data-at-rest encryption and keys | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-encryption-of-data-at-rest |
| Secure Speech service with Virtual Network service endpoints | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-service-vnet-service-endpoint |
| Secure Azure AI Speech with Private Link endpoints | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-services-private-link |

### Configuration
| Topic | URL |
|-------|-----|
| Configure Batch synthesis properties for text-to-speech | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/batch-synthesis-properties |
| Check status and retrieve batch transcription results | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/batch-transcription-get |
| Configure BYOS storage for Speech to text | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/bring-your-own-storage-speech-resource-speech-to-text |
| Configure language ID and diarization in Azure Speech | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/configure-language-identification-diarization |
| Define UPS phonetic pronunciations for Speech to text | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/customize-pronunciation |
| Configure OpenSSL on Linux for Azure Speech SDK | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-configure-openssl-linux |
| Control and monitor Speech SDK service connections | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-control-connections |
| Configure post-processing options for Azure speech recognition | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-post-processing |
| Configure real-time speech recognition with Azure Speech | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-recognize-speech |
| Select and configure audio input devices in Speech SDK | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-select-audio-input-devices |
| Use visemes for facial animation with Speech service | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-speech-synthesis-viseme |
| Configure Speech SDK audio input streams | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-use-audio-input-streams |
| Configure compressed audio input for Speech SDK and CLI | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-use-codec-compressed-audio-input-streams |
| Enable and configure Speech SDK diagnostic logging | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-use-logging |
| Configure interim responses for Voice Live latency | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-voice-live-interim-response |
| Configure OpenTelemetry tracing for Voice Live SDK | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-voice-live-telemetry |
| Configure audio and transcription logging for Speech recognition | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/logging-audio-transcription |
| Create and manage personal voice speaker profiles | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/personal-voice-create-voice |
| Upload and validate training datasets for professional voice | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/professional-voice-create-training-set |
| Configure Azure Speech text-to-speech avatar options | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/quickstarts/get-started-text-to-speech-avatar |
| Use correct Azure Speech regional endpoints | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/regions |
| Configure Speech containers storage, logging, and security | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-configuration |
| Set up fast transcription containers for Azure Speech | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-ft |
| Configure and run Azure Speech-to-text containers | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-stt |
| Control speech output using SSML configuration | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-synthesis-markup |
| Configure pronunciation with SSML phonemes and lexicons | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-synthesis-markup-pronunciation |
| Structure SSML documents and events for Speech | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-synthesis-markup-structure |
| Configure Speech CLI datastore search order and files | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/spx-data-store-configuration |
| Configure output destinations for Speech CLI results | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/spx-output-options |
| Configure batch synthesis properties for TTS avatars | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/text-to-speech-avatar/batch-synthesis-avatar-properties |
| Reference Voice Live API events, models, and settings (2025-10-01) | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/voice-live-api-reference-2025-10-01 |
| Reference Voice Live API events and settings (2026-01-01-preview) | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/voice-live-api-reference-2026-01-01-preview |

### Integrations & Coding Patterns
| Topic | URL |
|-------|-----|
| Integrate Speech service with call center telephony | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/call-center-telephony-integration |
| Call Azure Speech fast transcription API in Foundry | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/fast-transcription-create |
| Use Speech SDK APIs to handle recognition results | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/get-speech-recognition-results |
| Integrate custom models with Voice Live API (BYOM) | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-bring-your-own-model |
| Implement text-to-speech synthesis with Speech SDK | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-speech-synthesis |
| Implement speech translation with Azure Speech SDK | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-translate-speech |
| Integrate Voice Live with Foundry Agent Service | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-voice-agent-integration |
| Implement function calling in Voice Live sessions | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-voice-live-function-calling |
| Integrate Voice Live with Foundry hosted agents | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-voice-live-hosted-agent-integration |
| Connect MCP servers to Voice Live sessions | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-voice-live-mcp-server |
| Add proactive greeting messages to Voice Live agents | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-voice-live-proactive-messages |
| Integrate Azure Speech with Azure OpenAI chat | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/openai-speech |
| Use Power Automate connector for Speech batch transcription | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/power-automate-batch-transcription |
| Use Speech to text REST API endpoints and parameters | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/rest-speech-to-text |
| Call Azure Speech-to-text short audio REST API | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/rest-speech-to-text-short |
| Call Speech text to speech REST API endpoints | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/rest-text-to-speech |
| Use SSML phonetic alphabets with Azure Speech | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-ssml-phonetic-sets |
| Use SSML to customize Azure Speech voices | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-synthesis-markup-voice |
| Generate Speech service REST clients from Swagger | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/swagger-documentation |
| Control text to speech avatar gestures with SSML | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/text-to-speech-avatar/avatar-gestures-with-ssml |
| Implement real-time text-to-speech avatar streaming | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/text-to-speech-avatar/real-time-synthesis-avatar |
| Use Voice Live WebSocket API events and models | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/voice-live-api-reference-2026-04-10 |
| Integrate with Voice Live preview WebSocket API | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/voice-live-api-reference-2026-06-01-preview |
| Implement Azure Voice Live real-time WebSocket integration | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/voice-live-how-to |

### Deployment
| Topic | URL |
|-------|-----|
| Use Batch synthesis API for long-form text-to-speech | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/batch-synthesis |
| Deploy custom speech models and endpoints | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-custom-speech-deploy-model |
| Scale Speech containers with batch processing kit | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-batch-processing |
| Run custom speech to text containers with Docker | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-cstt |
| Deploy and run Speech containers with Docker | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-howto |
| Run Speech containers on Kubernetes with Helm | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-howto-on-premises |
| Deploy language identification containers with Docker | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-lid |
| Deploy neural text to speech containers with Docker | https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-container-ntts |