Get started with the group calling hero sample


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The Azure Communication Services Group Calling Hero Sample demonstrates how the Communication Services Calling Web client library can be used to build a group calling experience.

In this Sample quickstart, we'll learn how the sample works before we run the sample on your local machine. We'll then deploy the sample to Azure using your own Azure Communication Services resources.


The sample has both a client-side application and a server-side application. The client-side application is a React/Redux web application that uses Microsoft's Fluent UI framework. This application sends requests to an ASP.NET Core server-side application that helps the client-side application connect to Azure.

Here's what the sample looks like:

Screenshot showing the landing page of the sample application.

When you press the "Start a call" button, the web application fetches a user access token from the server-side application. This token is then used to connect the client app to Azure Communication Services. Once the token is retrieved, you'll be prompted to specify the camera and microphone that you want to use. You'll be able to disable/enable your devices with toggle controls:

Screenshot showing the pre-call screen of the sample application.

Once you configure your display name and devices, you can join the call session. Now you will see the main call canvas where the core calling experience lives.

Screenshot showing the main screen of the sample application.

Components of the main calling screen:

  1. Media Gallery: The main stage where participants are shown. If a participant has their camera enabled, their video feed is shown here. Each participant has an individual tile which shows their display name and video stream (when there is one)
  2. Header: This is where the primary call controls are located to toggle settings and participant side bar, turn video and mix on/off, share screen and leave the call.
  3. Side Bar: This is where participants and settings information are shown when toggled using the controls on the header. The component can be dismissed using the 'X' on the top right corner. Participants side bar will show a list of participants and a link to invite more users to chat. Settings side bar allows you to configure microphone and camera settings.

Below you'll find more information on prerequisites and steps to set up the sample.


Locally deploy the service & client applications

The group calling sample is essentially two applications: the ClientApp and the Service.NET app.

When we want to deploy locally we need to start up both applications. When the server app is visited from the browser, it will use the locally deployed ClientApp for the user experience.

You can test the sample locally by opening multiple browser sessions with the URL of your call to simulate a multi-user call.

Before running the sample for the first time

  1. Open an instance of PowerShell, Windows Terminal, Command Prompt or equivalent and navigate to the directory that you'd like to clone the sample to.
  2. git clone
  3. Get the Connection String from the Azure portal. For more information on connection strings, see Create an Azure Communication Resources
  4. Once you get the Connection String, add the connection string to the Calling/appsetting.json file found under the Service .NET folder. Input your connection string in the variable: ResourceConnectionString.

Local Run

  1. Go to Calling folder and open Calling.csproj solution in Visual Studio
  2. Run Calling project. The browser will open at localhost:5001


  • The solution doesn't build; it throws errors during NPM installation/build.

    Try to clean/rebuild the projects.

Publish the sample to Azure

  1. Right click on the Calling project and select Publish.
  2. Create a new publish profile and select your Azure subscription.
  3. Before publishing, add your connection string with Edit App Service Settings, and fill in ResourceConnectionString as the key and provide your connection string (copied from appsettings.json) as the value.

Clean up resources

If you want to clean up and remove a Communication Services subscription, you can delete the resource or resource group. Deleting the resource group also deletes any other resources associated with it. Learn more about cleaning up resources.

Next steps

For more information, see the following articles:

Additional reading