UI Library use cases

Use components and composites in Azure Communication Services UI Library to create call and chat experiences in your applications.

In a composite, call and chat capabilities are built in directly and exposed when you integrate the composite into an application. In a UI component, call and chat capabilities are exposed through a combination of UI functionality and underlying stateful libraries. To take full advantage of these capabilities, we recommend that you use UI components with stateful call and chat client libraries.

Get more conceptual documentation, quickstarts, and examples in the UI Library storybook.

Call use cases

Area	Use cases
Call types	Join a Microsoft Teams meeting.
	Join an Azure Communication Services call by using a group ID.
	Join an Azure Communication Services room.
	Start an outbound call to another Azure Communication Services user.
	Start an outbound call to a phone number.
Teams interoperability	Join the call lobby.
	Display a transcription and recording alert banner.
Call controls	Mute and unmute a call.
	Turn video on and off during a call.
	Turn on screen sharing.
	End a call.
Participant gallery	Show remote participants on a grid.
	Make video preview available throughout a call for a local user.
	Make default avatars available when video is off.
	Show shared screen content in the participant gallery.
Call configuration	Manage the microphone device.
	Manage the camera device.
	Manage the speaker device.
	Make local preview available for user to check video.
Participants	Show a participant roster.

Chat use cases

Area	Azure Communication Services chat	Teams interoperability chat
Chat types	Join an Azure Communication Services chat thread.	Join a Microsoft Teams meeting chat.
Chat actions	Send and receive text messages.	Send and receive text messages.
	Send and receive rich text messages.*	Send and receive rich text messages.*
	-	Receive inline images.
	Send and receive file attachments.	Receive file attachments.*
Chat events	Send and receive typing indicators.	Send and receive typing indicators.**
	Send and receive read receipts.	Send and receive read receipts.
	Show when a participant is added or removed.	Show when a participant is added or removed.
Participants	Show a participant roster.	Show a participant roster.

*Send rich text messages and file attachment support are currently in public preview. Preview APIs and SDKs are provided without a service-level agreement. We recommend that you don't use them for production workloads. Some features might not be supported, or they might have constrained capabilities. For more information, review Supplemental Terms of Use for Microsoft Azure Previews.

**The display name of the typing event from the Teams user might not show properly.

Supported identities

To initialize a composite and authenticate to the service, a user must have an Azure Communication Services identity. For more information, see Authenticate to Azure Communication Services and Quickstart: Create and manage access tokens.

Teams interoperability

For Teams interoperability scenarios, you can use UI Library composites to add a user to a Teams meeting via Azure Communication Services. To enable Teams interoperability, use either the default features in the call composite or the chat composite. You can also use UI components to build a custom experience.

When you add both calling and chat to an application, remember that the chat client can't be initialized until the participant is admitted to the call. After the participant is admitted, you can initialize the chat client to join the meeting chat thread. The pattern is demonstrated in the following figure.

If you use UI components to deliver Teams interoperability experiences, begin by using UI Library examples to create key pieces of the experience:

• Lobby example: A sample lobby where a participant can wait to be admitted to a call.
• Compliance banner: A sample banner that shows the user if the call is being recorded.
• Teams theme: A sample theme that makes UI Library elements look like Microsoft Teams.
• Image sharing*: A sample that shows how an Azure Communication Services user can receive images sent by the Teams user.
• File sharing*: A sample that shows how an Azure Communication Services user can receive file attachments sent by the Teams user.

Customization

Use UI Library patterns to modify components to match the look and feel of your application. Customization is a key difference between composites and UI components in Azure Communication Services. Composites have fewer customization options for a simpler integration experience.

The following table compares composites and UI components for customization use cases.

Use case	Composites	UI components
Use Fluent-based theming.	X	X
Compose the experience layout.		X
Use CSS styling to modify style properties.		X
Replace icons.		X
Modify the participant gallery layout.		X
Modify the call control layout.	X	X
Inject data models to modify user metadata.	X	X

Observability

The state management architecture of UI Library is decoupled, so you can access stateful call and chat clients directly. Hook into the stateful client to read the state, handle events, and override behavior to pass onto the UI components.

The following table compares composites and UI components for observability use cases.

Use case	Composites	UI components
Access call and chat client state.	X	X
Access and handle client events.	X	X
Access and handle UI events.	X	X

Recommended architecture

Initialize a composite and base component by using an Azure Communication Services access token. It's important to get access tokens from Azure Communication Services through a trusted service that you manage. For more information, see Quickstart: Create and manage access tokens and the trusted service tutorial.

Call and chat client libraries must have the context for the call or chat they join. Disseminate the context to clients by using your own trusted service. For example, use user access tokens.

The following table summarizes initialization and resource management functions that are required to add context to a client library.

Contoso responsibilities	UI Library responsibilities
Provide an access token from Azure.	Pass through the provided access token to initialize components.
Provide a refresh function.	Refresh the access token by using a developer-provided function.
Retrieve and pass join information for the call or chat.	Pass through call and chat information to initialize components.
Retrieve and pass user information for any custom data model.	Pass through a custom data model to components to render.

Platform support

SDK	Windows	macOS	Ubuntu	Linux	Android	iOS
UI SDK	Chrome,* Microsoft Edge	Chrome,* Safari**	Chrome*	Chrome*	Chrome*	Safari**

*The current version of Chrome and the two preceding releases are supported.

**Safari version 13.1 and later versions are supported. Outgoing video for Safari macOS isn't yet supported, but it's supported for iOS. Outgoing screen sharing is supported only on desktop iOS.

Accessibility

Accessibility by design is a principle across Microsoft products. UI Library follows this principle, and all UI components are fully accessible.

Localization

Localization is key to making products for users around the world who speak different languages. UI Library provides default support for some languages and capabilities. This support includes right-to-left languages. You can provide their own localization files to use with UI Library.

Known issues

UI Library doesn't support updating the message type when editing existing messages at this time. Adding rich text formatting to an existing message adds HTML styling to the text content. Because the message type doesn't change, the result might be HTML content that appears as plain text in the message thread.

Visit UI Library storybook.

Use CallComposite and ChatComposite in Azure Communication Services UI Library to create call experiences in your iOS and Android applications. By using a couple lines of code, you can easily integrate an entire call and chat experience in your application. Composites in Azure Communication Services manage the entire lifecycle of the call and chat, from setup until the call and chat end.

Calling use cases

Use the call composite in Azure Communication Services to create these use cases.

Area	Use cases
Call types	Join a Microsoft Teams meeting.
	Join a Microsoft Teams meeting by using a meeting ID and passcode.
	Join a call by using a group ID.
	Join a call by using a room ID.
	Make and receive 1:1 calls.
Teams interoperability	Join the call lobby.
	Display a transcription and recording alert banner.
	Admit or reject lobby participants.
Closed Captions	Teams interoperability.
	Group call, rooms call, and 1:1 call.
Participant gallery	Show remote participants on a grid.
	Make video preview available throughout a call for a local user.
	Make default avatars available when video is off.
	Show shared screen content in the participant gallery.
	Enable participant avatar customization.
	Show a participant roster.
Call management	Manage the microphone device.
	Manage the camera device.
	Manage the speaker device (wired or Bluetooth).
	Make local preview available for a user to check video.
	Subscribe events.
Call controls	Mute and unmute a call.
	Turn video on or off during a call.
	End a call.
	Hold and resume a call after audio interruption.
	CallKit and TelecomManager support.
Customize the experience	Button bar customization.
	Title and subtitle configuration.
	Enable end call confirmation dialogue.
	Skip setup screen.

Call integration

This section discusses integration for calls.

Teams interoperability

For Teams interoperability scenarios, you can use UI Library composites to add a user to a Teams meeting via Azure Communication Services. To enable Teams interoperability, use the call composite. The composite manages the entire lifecycle of joining a Teams interoperability call.

The following figure shows an example of the user experience before a caller is added to a Teams meeting.

Rooms integration

Azure Communication Services provides a concept of a room for developers who are building structured conversations, such as virtual appointments or virtual events. Rooms currently allow voice and video calling.

A room is a container that manages activity between Azure Communication Services users. A room offers application developers better control over who can join a call, when they meet, and how they collaborate. To learn more about rooms, see the conceptual documentation.

A user is invited to a room by using the Rooms API in one of the three following roles:

• Presenter (default)
• Attendee
• Consumer

The distinction between each role lies in the capabilities they possess during a room call when CallComposite is used. The specific capabilities associated with each role are described in Virtual rooms overview.

Note

The Rooms API serves the purpose of creating rooms, managing users, and adjusting the lifetime of rooms. The Rooms API is a back-end service that's separate from UI Library.

One-to-one call and PUSH notification support

UI Library supports one-to-one VoIP calls to dial users by communication identifier. To receive an incoming call, UI Library also supports registering for PUSH notifications. To learn more about the integration for Android and iOS platforms and use of the API, see Make a one-to-one call and receive PUSH notifications.

Calling features

Several features are available for calling.

Accessibility

Accessibility is a key focus of the call libraries. Use a screen reader to make important announcements about call status and to help ensure that visually impaired users can effectively participate when they use the application.

Closed captions

Closed captions enable a wide range of scenarios, including interoperability with Teams, Azure Communication Services group calls, room calls, and one-on-one calls. This feature ensures that users can follow along with conversations in various calling environments, enhancing accessibility and user experience.

Users need to manually select the language for captions by using UI Library out of the box because the system doesn't automatically detect the spoken language.

For more information about closed captions, see the documentation to review explanations and usage guidelines. If you want to configure closed captions directly within UI Library, follow the tutorial for easy setup.

Events

Developers can now subscribe to events within the CallComposite property. With this feature, they can attach listeners to specific events throughout the call lifecycle. This enhancement provides greater control and customization opportunities. Developers can trigger custom actions based on events like participant join or participants who left the call. They can also use events for logging interactions, dynamically updating user interfaces, or enhancing overall functionality.

For more information, see Handle events in UI Library.

Localization

Localization is key to making products for users around the world who speak different languages. UI Library supports 12 languages: English, Spanish, French, German, Italian, Japanese, Korean, Dutch, Portuguese, Russian, Turkish, and Chinese. It also supports right-to-left languages. For more information, see Add localization to your app.

Multitasking and picture-in-picture mode

UI Library supports the picture-in-picture mode for the call screen. While in a call, users can select the back button on the call screen to enable multitasking to take them back to the previous screen. If the picture-in-picture mode is enabled, a system picture-in-picture appears for the call. To learn more about multitasking and the picture-in-picture mode for both the Android and iOS platforms and use of the API, see Turn on picture-in-picture by using UI Library.

Screen orientation

UI Library supports screen orientation setup for each of the screens separately before the start of the library experience. Application developers can set up a fixed orientation for the calling experience, which would align their application orientation. To learn more about the list of supported orientation for both the Android and iOS platforms and use of the API, see Set screen orientation by using UI Library.

Screen size

Adapt the Azure Communication Services call composite to adapt to screen sizes from five inches to tablet size. Use split mode and tablet mode in the call composite to get the dynamic participants' roster layout, provide clarity on the view, and focus on the conversation.

Split mode	Tablet mode

View data injection

Use UI Library for mobile native platforms to give local and remote participants the option to customize how they appear as users in a call. A local participant can choose a local avatar, custom display name, and navigation's title and subtitle on the setup screen when a call begins. A remote user can create a customized avatar when they join the meeting. For more information, see Inject a custom data model in UI Library.

View shared content

Through UI Library for mobile native platforms, call participants can view shared content when other participants share their screens during a Teams call. A remote participant can use stretch and pinch gestures to zoom in or out on the shared content in the call.

OS integrations

Integrate with your OS.

CallKit support

UI Library supports CallKit integration to handle interaction with CallKit for calls. To learn more about the integration for the iOS platform and use of the API, see Integrate CallKit into UI Library.

TelecomManager support

UI Library now supports integration with TelecomManager and allows for the handling of call hold and resume functions. To learn more about the integration for the Android platform and use of the API, see Integrate TelecomManager into UI Library.

Customize the call experience

You can customize your call experience.

Audio-only mode

The audio-only mode in UI Library allows participants to join calls by using only their audio, without sharing or receiving video. This feature is used to conserve bandwidth and maximize privacy. When activated, the audio-only mode automatically disables the video functionalities for both sending and receiving streams. It adjusts the UI to reflect this change by removing video-related controls. Enable this mode through the CallComposite configuration. For more information, see the Audio-only quickstart.

Disable end call prompt

When you develop applications that integrate calling capabilities, it's crucial to ensure a seamless and intuitive user experience. One area where you can streamline the user experience is during the call termination process. Specifically, developers might find it beneficial to disable the left call confirmation prompt that appears when a user wants to end a call. This feature, while useful in preventing accidental call terminations, can sometimes hinder the user experience, especially in environments where speed and efficiency are crucial. For more information, see Disable the call confirmation.

Fast-paced communication environments: In settings like trading floors, emergency call centers, or customer service centers, decisions and actions must be carried out rapidly. The extra step of confirming call termination can impede workflow efficiency.

Button bar customization

The functionality allows developers to add new actions into the contextual menu or remove current buttons in the button bar. They can provide the flexibility to introduce custom actions and tailor the user interface according to specific application needs.

• Add custom buttons: Developers can introduce new buttons into the contextual button bar to trigger custom actions.
• Remove existing buttons: Developers can remove unnecessary default buttons to streamline the interface, such as camera, microphone, or audio selection.

Consider the following constraints during the implementation of this feature:

• Icons and labels: Icons are added only for new actions. The button bar icons keep the predefined icons, and the labels should be concise to fit the menu dimension.
• Accessibility considerations: Developers should ensure that all custom buttons are accessible, including appropriate labeling for screen readers.

Remove buttons	Add custom actions

Use cases

• Custom in-call actions: A business application can add a custom Report Issue button, which allows users to directly report technical issues during a call.
• Branding and user experience: An enterprise app can remove buttons that are irrelevant to its use case and add branded buttons that enhance the user experience.

To ensure a consistent call experience, we recommend that you integrate Fluent UI icons into your project. They're available at the Fluent UI GitHub repository. By doing so, your custom icons match the design of the CallComposite property and create a cohesive and professional appearance.

Best practices

• Clean design: Avoid overcrowding the contextual menu bar. Only add buttons that are essential for the user experience.
• User testing: Conduct user testing to ensure that the customizations meet user needs and don't confuse or overwhelm them.
• Feedback mechanism: Adding buttons like Report Issue ensure that a robust back-end system is available to handle the feedback collected. Reuse the mechanism that UI Library provides by default.

For more information, see Customize buttons.

Skip setup screen

UI Library provides the capability to join a call by skipping the setup screen of the call join experience. By default, you go through a setup screen to join a call. Here, you set the call configuration, such as camera turn on or off, microphone turn on or off, and audio device selection before you join a call. This screen requires user interaction to join a call, which might be unnecessary for some users. So we provide the capability to join a call by skipping the setup screen and providing the call configuration APIs. For more information, see Skip setup screen feature.

Theming and colors

Use the UI Library call composite for iOS and Android to create a custom theme of a caller's experience. You have the flexibility to customize the primary colors so that you can tailor the color scheme to match your specific branding needs. By adjusting primary colors, you can ensure that the interface integrates with your brand's visual identity. You can enhance user experience while you maintain consistency across your applications. For more information, see Create your theme.

Android	iOS

Title and subtitle

Use UI Library to input custom strings, which make it easier to tailor the call interface to suit your specific needs. You can customize the title and subtitle of a call, both during the setup phase and while the call is in progress.

For example, in a corporate environment, you can set the title to reflect the meeting's agenda and the subtitle to indicate an announcement. For customer support, agents can use titles to display the nature of the inquiry to enhance clarity and communication.

During calls with time-sensitive discussions, you can also use the subtitle to display the call duration to ensure that all participants are aware of the time constraints.

For more information, see Set up the title and subtitle.

---

Chat use cases

Important

This feature of Azure Communication Services is currently in preview.

Preview APIs and SDKs are provided without a service-level agreement. We recommend that you don't use them for production workloads. Some features might not be supported, or they might have constrained capabilities.

For more information, review Supplemental Terms of Use for Microsoft Azure Previews.

Area	Use cases
Chat types	Join an Azure Communication Services chat thread.
Chat actions	Send a chat message.
	Receive a chat message.
Chat events	Show typing indicators.
	Show a read receipt.
	Show when a participant is added or removed.
	Show changes to the chat title.

Flexibility

The ChatComposite property was designed to fit into different layouts and views in your application. For example, you could choose to place Chat in a navigation view, modal view, or some other view. The ChatComposite property adjusts itself and ensures that the user has a seamless experience.

Navigation view	Modal view

Supported identities

To initialize a composite and authenticate to the service, a user must have an Azure Communication Services identity. For more information, see Authenticate to Azure Communication Services and Quickstart: Create and manage access tokens.

Recommended architecture

Initialize a composite by using an Azure Communication Services access token. It's important to get access tokens from Azure Communication Services through a trusted service that you manage. For more information, see Quickstart: Create and manage access tokens and the trusted service tutorial.

Call and chat client libraries must have the context for the call they join. Disseminate the context to clients by using your own trusted service. For example, use user access tokens. The following table summarizes the initialization and resource management functions that are required to add context to a client library.

Contoso responsibilities	UI Library responsibilities
Provide an access token from Azure.	Pass through the provided access token to initialize components.
Provide a refresh function.	Refresh the access token by using a developer-provided function.
Retrieve and pass join information for the call or chat.	Pass through call and chat information to initialize components.
Retrieve and pass user information for any custom data model.	Pass through a custom data model to components to render.

Platform support

Platform	Versions
iOS	iOS 14 and later
Android	API 21 and later

Troubleshooting guide

When troubleshooting happens for voice or video calls, you might be asked to provide a call ID. This ID is used to identify Azure Communication Services calls.

To retrieve this call ID, use the action bar at the bottom of the call screen. Select the ellipsis button to see Share diagnostics info. Use this option to share the diagnostics information that's required to track any issues by the support team.

For programmatic access to the call ID, see Get debug information programmatically.

For more information about troubleshooting, see Troubleshooting in Azure Communication Services.

Calling screen	Diagnostic information menu	Share call ID

Quickstart guides