# Azure Communication Services

> Expert knowledge for Azure Communication Services development including troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when building ACS calling/chat apps, SMS/email senders, Teams interop, Rooms/Job Router, or WhatsApp flows, and other Azure Communication Services related development tasks. Not for Azure AI Bot Service (use azure-bot-service), Azure Notification Hubs (use azure-notification-hubs), Azure Web PubSub (use azure-web-pubsub), Azure SignalR Service (use azure-signalr-service).

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

---

# Azure Communication Services Skill

This skill provides expert guidance for Azure Communication Services. Covers troubleshooting, best practices, decision making, architecture & design patterns, 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 | L37-L111 | Diagnosing and fixing ACS calling, SMS, email, Teams, PSTN, audio/video, device, network, and SDK issues, plus collecting logs, UFD events, and diagnostics for support. |
| Best Practices | L112-L137 | Best practices for ACS calling, SMS, email, IDs, auth, Teams interop, network/quality, spam/opt-out compliance, and production-ready virtual visit and meeting experiences. |
| Decision Making | L138-L154 | Guidance for planning ACS solutions: Teams interop in gov clouds, PSTN/phone number options, pricing/licensing, and migration from Twilio Video/Chat to ACS Calling/Chat. |
| Architecture & Design Patterns | L155-L160 | Designing scalable contact center solutions with ACS and patterns for integrating ACS with ExpressRoute for secure, private connectivity and network architecture. |
| Limits & Quotas | L161-L228 | Limits, quotas, and regional rules for ACS calling, phone numbers, SMS, email sending, Teams interop, media features, and emergency/toll‑free/direct routing constraints. |
| Security | L229-L254 | Security, auth, and compliance for ACS: encryption, identities, HMAC, caller ID, email/SMTP, Teams interop, captions/transcription, emergency calling, and secure webhooks/Rooms. |
| Configuration | L255-L332 | Configuring monitoring, logging, metrics, and insights for ACS (chat, voice/video, calls, SMS, email), plus setup for Teams interop, direct routing, UI Library options, and SMS/email domain/sender settings. |
| Integrations & Coding Patterns | L333-L480 | End-to-end patterns for integrating ACS calling, chat, SMS, email, Rooms, Job Router, WhatsApp, Teams, OpenAI/bots, and UI libraries, including media control, events, push, and telephony interop. |
| Deployment | L481-L485 | Infrastructure and deployment guidance for Azure Communication Services: direct routing requirements and automating ACS/Email resource provisioning with PowerShell. |

### Troubleshooting
| Topic | URL |
|-------|-----|
| Use Job Router operational logs for diagnostics | https://learn.microsoft.com/en-us/azure/communication-services/concepts/analytics/logs/router-logs |
| Troubleshoot ACS email custom domain configuration issues | https://learn.microsoft.com/en-us/azure/communication-services/concepts/email/email-domain-configuration-troubleshooting |
| Monitor logs and metrics for ACS Teams external users | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/guest/monitor-logs-metrics |
| Troubleshoot common Teams Phone extensibility issues with ACS | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/tpe/teams-phone-extensibility-troubleshooting |
| Resolve common Azure SMS questions and issues | https://learn.microsoft.com/en-us/azure/communication-services/concepts/sms/sms-faq |
| Troubleshoot ACS direct routing outbound call failures | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/monitoring-troubleshooting-telephony/troubleshoot-outbound-calls |
| Fix ACS direct routing TLS certificate and SIP OPTIONS issues | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/monitoring-troubleshooting-telephony/troubleshoot-tls-certificate-sip-options |
| Troubleshoot ACS PSTN call failures using result codes | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/troubleshooting-pstn-call-failures |
| Collect troubleshooting information for Azure Communication Services | https://learn.microsoft.com/en-us/azure/communication-services/concepts/troubleshooting-info |
| Use ACS Call Diagnostics to investigate call issues | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/call-diagnostics |
| Diagnose Azure Communication Services call quality issues | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/call-diagnostics |
| Review known issues in ACS native calling SDKs | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/known-issues-native |
| Review known issues for ACS WebJS calling SDK | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/known-issues-webjs |
| Diagnose and fix ACS web VoIP call quality issues | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/troubleshoot-web-voip-quality |
| Use User Facing Diagnostics to detect ACS call issues | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/user-facing-diagnostics |
| Troubleshoot ACS UI Library calls and collect debug info | https://learn.microsoft.com/en-us/azure/communication-services/how-tos/ui-library-sdk/troubleshooting |
| Troubleshoot Azure-linked WhatsApp Business accounts | https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/advanced-messaging/whatsapp/whatsapp-business-account-faq |
| Resolve audio delay issues in ACS calls | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/audio-issues/delay-issue |
| Fix echo problems in ACS audio calls | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/audio-issues/echo-issue |
| Troubleshoot low incoming audio volume in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/audio-issues/incoming-audio-low-volume |
| Resolve one-way audio from faulty microphones in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/audio-issues/microphone-issue |
| Fix one-way audio when microphone permission is denied | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/audio-issues/microphone-permission |
| Handle one-way audio caused by network issues in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/audio-issues/network-issue |
| Diagnose ACS audio issues using UFD and device checks | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/audio-issues/overview |
| Diagnose poor audio quality in ACS calls | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/audio-issues/poor-quality |
| Resolve one-way audio from speaker issues in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/audio-issues/speaker-issue |
| Fix ACS calls ending with 410/3112 network errors | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/call-setup-issues/call-ends-with-410-3112 |
| Resolve long ACS call setup times | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/call-setup-issues/call-setup-takes-too-long |
| Fix ACS CallAgent creation failures in Calling SDK | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/call-setup-issues/failed-to-create-call-agent |
| Troubleshoot missing incoming call notifications in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/call-setup-issues/no-incoming-call-notifications |
| Identify stages of ACS call setup issues | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/call-setup-issues/overview |
| Troubleshoot slow askDevicePermission responses in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/device-issues/ask-device-permission-api-takes-too-long |
| Fix missing detailed microphone list in ACS Calling SDK | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/device-issues/no-enumerated-microphone-list |
| Fix missing detailed speaker list in ACS Calling SDK | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/device-issues/no-enumerated-speaker-list |
| Resolve missing permission prompts in ACS device access | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/device-issues/no-permission-prompt |
| Understand ACS device and permission issues in calls | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/device-issues/overview |
| Apply general troubleshooting strategies for ACS calls | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/general-troubleshooting-strategies/overview |
| Report unresolved ACS calling issues effectively | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/general-troubleshooting-strategies/report-issue |
| Interpret ACS Calling SDK error messages and codes | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/general-troubleshooting-strategies/understanding-error-codes |
| Collect verbose browser logs for ACS troubleshooting | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/how-to-collect-browser-verbose-log |
| Collect ACS call information for support diagnosis | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/how-to-collect-call-info |
| Enable and manage ACS WebJS client logging | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/how-to-collect-client-logs |
| Capture diagnostic audio recordings for ACS calls | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/how-to-collect-diagnostic-audio-recordings |
| Gather Windows audio event logs for ACS issues | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/how-to-collect-windows-audio-event-log |
| Resolve cameraFreeze UFD and frozen video in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/camera-freeze |
| Interpret cameraPermissionDenied UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/camera-permission-denied |
| Fix cameraStartFailed UFD when ACS video won’t start | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/camera-start-failed |
| Diagnose cameraStartTimedOut UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/camera-start-timed-out |
| Handle cameraStoppedUnexpectedly UFD in ACS video | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/camera-stopped-unexpectedly |
| Fix capturerStartFailed UFD for ACS screen sharing | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/capturer-start-failed |
| Investigate capturerStoppedUnexpectedly UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/capturer-stopped-unexpectedly |
| Investigate microphoneMuteUnexpectedly UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/microphone-mute-unexpectedly |
| Handle microphoneNotFunctioning UFD in ACS calls | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/microphone-not-functioning |
| Interpret microphonePermissionDenied UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/microphone-permission-denied |
| Understand networkReceiveQuality UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/network-receive-quality |
| Diagnose networkReconnect UFD and ICE failures in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/network-reconnect |
| Handle networkRelaysNotReachable UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/network-relays-not-reachable |
| Understand networkSendQuality UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/network-send-quality |
| Fix noMicrophoneDevicesEnumerated UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/no-microphone-devices-enumerated |
| Interpret noNetwork UFD events in ACS calls | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/no-network |
| Resolve noSpeakerDevicesEnumerated UFD in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/no-speaker-devices-enumerated |
| Resolve screenshareRecordingDisabled UFD on macOS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/screenshare-recording-disabled |
| Use speakingWhileMicrophoneIsMuted UFD to aid users | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/references/ufd/speaking-while-microphone-is-muted |
| Troubleshoot call end response codes across ACS SDKs | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/troubleshooting-codes |
| Avoid createView errors when disposing ACS video renderer | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/video-issues/application-disposes-video-renderer |
| Diagnose ACS createView timeout video errors | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/video-issues/create-view-timeout |
| Mitigate poor ACS video quality on bad networks | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/video-issues/network-poor |
| Recover when remote ACS video becomes unavailable | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/video-issues/remote-video-becomes-unavailable |
| Handle unavailable video subscription errors in ACS | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/video-issues/subscribing-video-not-available |
| Troubleshoot frozen sender video in ACS calls | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/video-issues/video-is-frozen |
| Address high CPU impact on ACS video quality | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/video-issues/video-sender-has-high-cpu-load |

### Best Practices
| Topic | URL |
|-------|-----|
| Apply best practices for ACS Calling SDK usage | https://learn.microsoft.com/en-us/azure/communication-services/concepts/best-practices |
| Implement answer machine detection with DTMF logic | https://learn.microsoft.com/en-us/azure/communication-services/concepts/call-automation/answer-machine-detection |
| Apply best practices for Communication Services user access tokens | https://learn.microsoft.com/en-us/azure/communication-services/concepts/credentials-best-practices |
| Manage Azure email opt-outs for B2C delivery | https://learn.microsoft.com/en-us/azure/communication-services/concepts/email/email-optout-management |
| Improve Azure email sender reputation and complaints | https://learn.microsoft.com/en-us/azure/communication-services/concepts/email/sender-reputation-managed-suppression-list |
| Govern Teams meeting experience for ACS virtual visits | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/virtual-visits/govern-meeting-experience |
| Optimize user experience for ACS–Teams virtual appointments | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/virtual-visits/plan-user-experience |
| Choose and use Raw ID string identifiers in ACS | https://learn.microsoft.com/en-us/azure/communication-services/concepts/raw-id-use-cases |
| Follow Azure SMS and email messaging policies | https://learn.microsoft.com/en-us/azure/communication-services/concepts/sms/messaging-policy |
| Fill Azure SMS short code program brief correctly | https://learn.microsoft.com/en-us/azure/communication-services/concepts/sms/program-brief-guidelines |
| Prepare 10DLC brand and campaign registration details | https://learn.microsoft.com/en-us/azure/communication-services/concepts/sms/ten-digit-long-code-guidelines |
| Complete Azure toll-free SMS verification application | https://learn.microsoft.com/en-us/azure/communication-services/concepts/sms/toll-free-verification-guidelines |
| Avoid ACS phone numbers being flagged as spam | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/prevent-spam-flag |
| Handle known Call Automation limitations and behaviors | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/known-issues-call-automation |
| Manage and improve ACS call quality in production | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/manage-call-quality |
| Apply network requirements for ACS voice and video quality | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/network-requirements |
| Apply ACS-specific UX best practices for calling | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/user-experience |
| Handle emergency calls in Teams Phone Extensibility | https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/tpe/teams-phone-extensibility-emergency-call |
| Optimize ACS audio calling in Azure Virtual Desktop VDI | https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/voice-video-calling/calling-from-virtual-desktop-infrastructure |
| Optimize ACS video layout and resolution on web | https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/voice-video-calling/optimizing-video-placement |
| Implement a production-ready ACS authentication backend (hero sample) | https://learn.microsoft.com/en-us/azure/communication-services/samples/trusted-auth-sample |
| Prepare devices for ACS-powered virtual appointments | https://learn.microsoft.com/en-us/azure/communication-services/tutorials/virtual-visits/extend-teams/precall |

### Decision Making
| Topic | URL |
|-------|-----|
| Use Azure Advisor recommendations for ACS optimization | https://learn.microsoft.com/en-us/azure/communication-services/concepts/advisor-overview |
| Use ACS Teams interop in government cloud environments | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/guest/government-cloud |
| Use ACS Teams user features in government cloud environments | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/teams-user/government-cloud |
| Map Teams Phone features to ACS SDK capabilities | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/tpe/teams-phone-extensibility-capabilities |
| Choose PSTN connectivity options and estimate cost for Teams Phone extensibility | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/tpe/teams-phone-extensibility-connectivity-cost |
| Decide on migration from Twilio Video to ACS Calling | https://learn.microsoft.com/en-us/azure/communication-services/concepts/migrate-to-azure-communication-services |
| Choose ACS phone number types and regions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/number-types |
| Understand pricing model for ACS Teams interop scenarios | https://learn.microsoft.com/en-us/azure/communication-services/concepts/pricing/teams-interop-pricing |
| Plan ACS PSTN usage with pricing and billing rules | https://learn.microsoft.com/en-us/azure/communication-services/concepts/pstn-pricing |
| Determine Teams license requirements for ACS Teams interop | https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/eligible-teams-licenses |
| Design and integrate custom event platforms with Teams and ACS | https://learn.microsoft.com/en-us/azure/communication-services/tutorials/events-playbook |
| Migrate Twilio Video implementations to ACS Calling | https://learn.microsoft.com/en-us/azure/communication-services/tutorials/migrating-to-azure-communication-services-calling |
| Migrate Twilio Conversations Chat to ACS Chat | https://learn.microsoft.com/en-us/azure/communication-services/tutorials/migrating-to-azure-communication-services-chat |

### Architecture & Design Patterns
| Topic | URL |
|-------|-----|
| Architect contact center solutions with Azure Communication Services | https://learn.microsoft.com/en-us/azure/communication-services/tutorials/contact-center |
| Architect ACS with ExpressRoute for private connectivity | https://learn.microsoft.com/en-us/azure/communication-services/tutorials/integrate-express-route |

### Limits & Quotas
| Topic | URL |
|-------|-----|
| Understand Call Automation metrics definitions and units | https://learn.microsoft.com/en-us/azure/communication-services/concepts/analytics/logs/call-automation-metrics |
| Supported MIME types for ACS email attachments | https://learn.microsoft.com/en-us/azure/communication-services/concepts/email/email-attachment-allowed-mime-types |
| Request higher email sending quotas in ACS | https://learn.microsoft.com/en-us/azure/communication-services/concepts/email/email-quota-increase |
| Review known issues and limitations for ACS Teams external users | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/guest/limitations |
| Check Azure phone number rules for Argentina | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-argentina |
| Check Azure phone number rules for Australia | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-australia |
| Azure phone number rules and SMS IDs for Austria | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-austria |
| Belgium ACS phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-belgium |
| Check Azure phone number rules for Brazil | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-brazil |
| Check Azure phone number rules for Canada | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-canada |
| Check Azure phone number rules for Chile | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-chile |
| Check Azure phone number rules for China | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-china |
| Check Colombia phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-colombia |
| Czech Republic ACS phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-czech-republic |
| Check Denmark phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-denmark |
| Check Estonia phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-estonia |
| Understand Finland phone number eligibility and restrictions in Azure Communication Services | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-finland |
| Check France phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-france |
| Check Germany phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-germany |
| Check Hong Kong phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-hong-kong |
| Check Indonesia phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-indonesia |
| Check Ireland phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-ireland |
| Check Israel phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-israel |
| Check Italy phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-italy |
| Check Japan phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-japan |
| Check Latvia phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-latvia |
| Check Lithuania phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-lithuania |
| Check Luxembourg phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-luxembourg |
| Check Malaysia phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-malaysia |
| Check Mexico phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-mexico |
| Check Netherlands phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-netherlands |
| Check New Zealand phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-new-zealand |
| Check Norway phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-norway |
| Check Philippines phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-philippines |
| Check Poland phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-poland |
| Check Portugal phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-portugal |
| Check Saudi Arabia phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-saudi-arabia |
| Check Singapore phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-singapore |
| Check Slovakia phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-slovakia |
| Check Slovenia phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-slovenia |
| Check South Africa phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-south-africa |
| Check South Korea phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-south-korea |
| Check Spain phone number availability and SMS restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-spain |
| Check Sweden phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-sweden |
| Check Switzerland phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-switzerland |
| Check Taiwan phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-taiwan |
| Check Thailand phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-thailand |
| Check UAE phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-united-arab-emirates |
| Check UK phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-united-kingdom |
| Check US phone number availability and restrictions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-united-states |
| Check country availability and eligibility for Azure numbers | https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/sub-eligibility-number-capability |
| Review Azure Communication Services API limits and quotas | https://learn.microsoft.com/en-us/azure/communication-services/concepts/service-limits |
| Use certified SBCs and understand ACS direct routing limits | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/certified-session-border-controllers |
| Implement ACS emergency calling by supported regions | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/emergency-calling-concept |
| Review known telephony limitations in ACS direct routing | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/known-limitations-acs-telephony |
| Understand ACS toll-free calling limitations by region | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/toll-free-calling |
| Understand limits for ACS trial and verified phone numbers | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/trial-phone-numbers-faq |
| Review Calling SDK platform support and feature limits | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/calling-sdk-features |
| Review RAW media access constraints in ACS Calling SDK | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/media-access |
| Configure Music Mode audio quality settings in ACS | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/music-mode |
| Handle ACS email sending tier limit exceptions | https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/email/send-email-advanced/throw-exception-when-tier-limit-reached |
| Get and manage ACS trial phone numbers with constraints | https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/telephony/get-trial-phone-number |
| Resolve ACS call setup failures from invalid or expired tokens | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/call-setup-issues/invalid-or-expired-tokens |
| ACS video subscription limits on browsers | https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/video-issues/reaching-max-number-of-active-video-subscriptions |

### Security
| Topic | URL |
|-------|-----|
| Understand data transfer and terms for WhatsApp in Azure | https://learn.microsoft.com/en-us/azure/communication-services/concepts/advanced-messaging/whatsapp/whatsapp-terms-of-service |
| Configure authentication methods for Azure Communication Services | https://learn.microsoft.com/en-us/azure/communication-services/concepts/authentication |
| Understand ACS call flow topologies and encryption | https://learn.microsoft.com/en-us/azure/communication-services/concepts/detailed-call-flows |
| Apply sender authentication best practices in Azure | https://learn.microsoft.com/en-us/azure/communication-services/concepts/email/email-authentication-best-practice |
| Configure Azure email domains and authentication | https://learn.microsoft.com/en-us/azure/communication-services/concepts/email/email-domain-and-sender-authentication |
| Use Azure Communication Services in US Government clouds | https://learn.microsoft.com/en-us/azure/communication-services/concepts/government |
| Configure authentication for single-tenant and multitenant ACS Teams apps | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/custom-teams-endpoint-authentication-overview |
| Configure closed captions for ACS–Teams interop calls | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/enable-closed-captions |
| Enable and license Teams interoperability for ACS users | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/enable-interoperability-teams |
| Understand security measures for ACS Teams external users | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/guest/security |
| Configure Teams admin controls for external ACS users | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/guest/teams-administration |
| Assign Microsoft Entra API permissions for ACS Teams calling | https://learn.microsoft.com/en-us/azure/communication-services/concepts/interop/teams-user/azure-ad-api-permissions |
| Use Rooms API for secure structured meetings | https://learn.microsoft.com/en-us/azure/communication-services/concepts/rooms/room-concept |
| Configure ACS caller ID and CNAM registration | https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/how-to-manage-your-calling-identity |
| Understand ACS closed captions behavior and data handling | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/closed-captions |
| Understand ACS Real Time Text compliance and usage | https://learn.microsoft.com/en-us/azure/communication-services/concepts/voice-video-calling/real-time-text |
| Secure Call Automation webhooks and Event Grid delivery | https://learn.microsoft.com/en-us/azure/communication-services/how-tos/call-automation/secure-webhook-endpoint |
| Display and consent to call transcription state in ACS | https://learn.microsoft.com/en-us/azure/communication-services/how-tos/calling-sdk/call-transcription |
| Use managed identity with Azure Communication Services securely | https://learn.microsoft.com/en-us/azure/communication-services/how-tos/managed-identity |
| Set up SMTP authentication for ACS email with Entra | https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/email/send-email-smtp/smtp-authentication |
| Implement Azure Communication Services emergency calling | https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/telephony/emergency-calling |
| Sign Azure Communication Services HTTP requests with HMAC | https://learn.microsoft.com/en-us/azure/communication-services/tutorials/hmac-header-tutorial |

### Configuration
| Topic | URL |
|-------|-----|
| Configure Advanced Messaging diagnostic logs in Azure | https://learn.microsoft.com/en-us/azure/communication-services/concepts/advanced-messaging/logs |
| Meet prerequisites to use WhatsApp in Copilot Studio | https://learn.microsoft.com/en-us/azure/communication-services/concepts/advanced-messaging/whatsapp/whatsapp-channel-prerequisites |
| Use Azure Communication Services chat metrics in Azure Monitor | https://learn.microsoft.com/en-us/azure/communication-services/concepts/analytics/chat-metrics |
| Configure Azure Monitor logging and metrics for Communication Services | https://learn.microsoft.com/en-us/azure/communication-services/concepts/analytics/enable-logging |
| Use Call Automation Insights workbooks for monitoring | https://learn.microsoft.com/en-us/azure/communication-services/concepts/analytics/insights/call-automation-insights |
| Use Call Recording Insights workbooks for analytics | https://learn.microsoft.com/en-us/azure/communication-services/concepts/analytics/insights/call-recording-insights |
| View Azure Communication Services chat insi

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