將語音電話新增至您的應用程式

使用通話 SDK 將語音和視訊通話新增至您的應用程式，以開始使用 Azure 通訊服務。

本文說明如何使用適用於 Windows 的 Azure 通訊服務通話 SDK 來啟動通話。

UWP

您可以在 呼叫適用於 .NET 的 SDK 上，從 GitHub 下載範例應用程式。

先決條件

若要完成本教學課程，您需要下列必要條件：

• 具有有效訂用帳戶的 Azure 帳戶。 免費建立帳戶。

• 安裝包含通用 Windows 平台開發工作負載的 Visual Studio 2022。

• 已部署通訊服務資源。 建立通訊服務資源。 您必須針對此快速入門記錄您的連接字串。

• 針對您的 Azure 通訊服務的使用者存取權杖。 您也可以使用 Azure CLI，並搭配您的連接字串執行命令，以建立使用者和存取權杖。

  az communication identity token issue --scope voip --connection-string "yourConnectionString"
  

  如需詳細資訊，請參閱使用 Azure CLI 建立和管理存取權杖。

設定

建立專案

在 Visual Studio 中，使用 [空白應用程式 (通用 Windows)] 範本建立新專案，以設定單頁通用 Windows 平台 (UWP) 應用程式。

安裝套件

以滑鼠右鍵按下您的項目，然後移至 Manage Nuget Packages 安裝 Azure.Communication.Calling.WindowsClient1.4.0 或更新版本。 如果您想要查看公開預覽的版本，請確定已核取 Include Prerelease。

要求存取

移至 Package.appxmanifest 並選取 Capabilities。 勾選 Internet (Client) 和 Internet (Client & Server) 以取得網際網路的輸入和輸出存取權。 勾選 Microphone 以存取麥克風的音訊來源，並勾選 Webcam 以存取相機的視訊來源。

設定應用程式架構

我們必須設定基本配置來附加邏輯。 為了撥打外撥電話，我們需要 TextBox 來提供被通話者的使用者識別碼。 我們也需要 [Start/Join call] 按鈕和 [Hang up] 按鈕。 此範例中也包含 Mute 和 BackgroundBlur 核取方塊，用於示範切換音訊狀態和視訊效果的功能。

開啟專案的 MainPage.xaml，並將 Grid 節點新增至 Page：

<Page
    x:Class="CallingQuickstart.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:CallingQuickstart"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Width="800" Height="600">

        <!-- Don't forget to replace ‘CallingQuickstart’ with your project’s name -->


    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="16*"/>
            <RowDefinition Height="30*"/>
            <RowDefinition Height="200*"/>
            <RowDefinition Height="60*"/>
            <RowDefinition Height="16*"/>
        </Grid.RowDefinitions>
        <TextBox Grid.Row="1" x:Name="CalleeTextBox" PlaceholderText="Who would you like to call?" TextWrapping="Wrap" VerticalAlignment="Center" Height="30" Margin="10,10,10,10" />

        <Grid x:Name="AppTitleBar" Background="LightSeaGreen">
            <TextBlock x:Name="QuickstartTitle" Text="Calling Quickstart sample title bar" Style="{StaticResource CaptionTextBlockStyle}" Padding="7,7,0,0"/>
        </Grid>

        <Grid Grid.Row="2">
            <Grid.RowDefinitions>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <MediaPlayerElement x:Name="LocalVideo" HorizontalAlignment="Center" Stretch="UniformToFill" Grid.Column="0" VerticalAlignment="Center" AutoPlay="True" />
            <MediaPlayerElement x:Name="RemoteVideo" HorizontalAlignment="Center" Stretch="UniformToFill" Grid.Column="1" VerticalAlignment="Center" AutoPlay="True" />
        </Grid>
        <StackPanel Grid.Row="3" Orientation="Vertical" Grid.RowSpan="2">
            <StackPanel Orientation="Horizontal">
                <Button x:Name="CallButton" Content="Start/Join call" Click="CallButton_Click" VerticalAlignment="Center" Margin="10,0,0,0" Height="40" Width="123"/>
                <Button x:Name="HangupButton" Content="Hang up" Click="HangupButton_Click" VerticalAlignment="Center" Margin="10,0,0,0" Height="40" Width="123"/>
                <CheckBox x:Name="MuteLocal" Content="Mute" Margin="10,0,0,0" Click="MuteLocal_Click" Width="74"/>
            </StackPanel>
        </StackPanel>
        <TextBox Grid.Row="5" x:Name="Stats" Text="" TextWrapping="Wrap" VerticalAlignment="Center" Height="30" Margin="0,2,0,0" BorderThickness="2" IsReadOnly="True" Foreground="LightSlateGray" />
    </Grid>
</Page>

開啟 MainPage.xaml.cs 並將內容取代為下列實作：

using Azure.Communication.Calling.WindowsClient;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Threading.Tasks;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Core;
using Windows.Media.Core;
using Windows.Networking.PushNotifications;
using Windows.UI;
using Windows.UI.ViewManagement;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

namespace CallingQuickstart
{
    public sealed partial class MainPage : Page
    {
        private const string authToken = "<AUTHENTICATION_TOKEN>";

        private CallClient callClient;
        private CallTokenRefreshOptions callTokenRefreshOptions = new CallTokenRefreshOptions(false);
        private CallAgent callAgent;
        private CommunicationCall call;

        private LocalOutgoingAudioStream micStream;

        #region Page initialization
        public MainPage()
        {
            this.InitializeComponent();
            // Additional UI customization code goes here
        }

        protected override async void OnNavigatedTo(NavigationEventArgs e)
        {
            await InitCallAgentAndDeviceManagerAsync();

            base.OnNavigatedTo(e);
        }
        #endregion

        #region UI event handlers
        private async void CallButton_Click(object sender, RoutedEventArgs e)
        {
            // Start a call
        }

        private async void HangupButton_Click(object sender, RoutedEventArgs e)
        {
            // Hang up a call
        }

        private async void MuteLocal_Click(object sender, RoutedEventArgs e)
        {
            // Toggle mute/unmute audio state of a call
        }
        #endregion

        #region API event handlers
        private async void OnIncomingCallAsync(object sender, IncomingCallReceivedEventArgs args)
        {
            // Handle incoming call event
        }

        private async void OnStateChangedAsync(object sender, PropertyChangedEventArgs args)
        {
            // Handle connected and disconnected state change of a call
        }
        #endregion

        #region Helper methods

        private async Task InitCallAgentAndDeviceManagerAsync()
        {
            //Initialize the call agent and search for devices
        }


        private async Task<CommunicationCall> StartCallAsync(string acsCallee)
        {
            // Start a call to an Azure Communication Services user using the CallAgent and the callee id
        }

        #endregion
    }
}

物件模型

下方列出類別和介面的表格會處理 Azure 通訊服務通話 SDK 的一些主要功能：

名稱	描述
CallClient	CallClient 是通話 SDK 的主要進入點。
CallAgent	使用CallAgent來啟動和管理通話。
CommunicationCall	使用 CommunicationCall 來管理進行中的呼叫。
CallTokenCredential	使用CallTokenCredential作為權杖憑證來實例化CallAgent。
CallIdentifier	使用 CallIdentifier 來表示使用者的身分識別，它可以是下列其中一個選項： UserCallIdentifier、 PhoneNumberCallIdentifier等等。

驗證用戶端

透過使用者存取權杖來將 CallAgent 執行個體初始化，此存取權杖可讓我們撥打和接聽通話，並選擇性地取得 DeviceManager 執行個體來查詢用戶端裝置設定。

在程式碼中，將 <AUTHENTICATION_TOKEN> 取代為使用者存取權杖。 如果您還沒有可用的令牌，請參閱 使用者存取令牌。

新增 InitCallAgentAndDeviceManagerAsync 函式，以啟動 SDK。 您可以自定義此協助程式，以符合應用程式的需求。

        private async Task InitCallAgentAndDeviceManagerAsync()
        {
            this.callClient = new CallClient(new CallClientOptions() {
                Diagnostics = new CallDiagnosticsOptions() { 
                    
                    // make sure to put your project AppName
                    AppName = "CallingQuickstart",

                    AppVersion="1.0",

                    Tags = new[] { "Calling", "ACS", "Windows" }
                    }

                });

            // Set up local audio stream using the first mic enumerated
            var deviceManager = await this.callClient.GetDeviceManagerAsync();
            var mic = deviceManager?.Microphones?.FirstOrDefault();

            micStream = new LocalOutgoingAudioStream();

            var tokenCredential = new CallTokenCredential(authToken, callTokenRefreshOptions);

            var callAgentOptions = new CallAgentOptions()
            {
                DisplayName = $"{Environment.MachineName}/{Environment.UserName}",
            };

            this.callAgent = await this.callClient.CreateCallAgentAsync(tokenCredential, callAgentOptions);

            this.callAgent.IncomingCallReceived += OnIncomingCallAsync;
        }

啟動呼叫

取得 StartCallOptions 物件之後，您可以使用 CallAgent c 來起始 Azure 通訊服務呼叫：

        private async Task<CommunicationCall> StartCallAsync(string acsCallee)
        {
            var options = new StartCallOptions();
            var call = await this.callAgent.StartCallAsync( new [] { new UserCallIdentifier(acsCallee) }, options);
            return call;
        }

結束通話

當使用者按兩下 [ 停止回應 ] 按鈕時，結束目前的呼叫。 將 實作新增至 HangupButton_Click 以結束呼叫，並停止預覽和視訊串流。

        private async void HangupButton_Click(object sender, RoutedEventArgs e)
        {
            var call = this.callAgent?.Calls?.FirstOrDefault();
            if (call != null)
            {
                await call.HangUpAsync(new HangUpOptions() { ForEveryone = false });
            }
        }

在音訊上切換靜音/取消靜音

當終端使用者按一下 [靜音] 按鈕時，將傳出音訊設為靜音。 將實作新增至 MuteLocal_Click 以將呼叫設為靜音。

        private async void MuteLocal_Click(object sender, RoutedEventArgs e)
        {
            var muteCheckbox = sender as CheckBox;

            if (muteCheckbox != null)
            {
                var call = this.callAgent?.Calls?.FirstOrDefault();

                if (call != null)
                {
                    if ((bool)muteCheckbox.IsChecked)
                    {
                        await call.MuteOutgoingAudioAsync();
                    }
                    else
                    {
                        await call.UnmuteOutgoingAudioAsync();
                    }
                }

                // Update the UI to reflect the state
            }
        }

接聽來電

IncomingCallReceived 事件接收設定於 SDK 啟動程序協助程式 InitCallAgentAndDeviceManagerAsync 中。

    this.callAgent.IncomingCallReceived += OnIncomingCallAsync;

應用程式有機會設定應如何接受來電，例如，視訊和音訊串流類型。

        private async void OnIncomingCallAsync(object sender, IncomingCallReceivedEventArgs args)
        {
            var incomingCall = args.IncomingCall;

            var acceptCallOptions = new AcceptCallOptions() { };

            call = await incomingCall.AcceptAsync(acceptCallOptions);
            call.StateChanged += OnStateChangedAsync;
        }

監視和回應通話狀態變更事件

物件 StateChanged 上的 CommunicationCall 事件會在進行中的呼叫從某個狀態轉換到另一個狀態時執行。 這項變更可讓您在應用程式中反映狀態變更或執行商業規則。

        private async void OnStateChangedAsync(object sender, PropertyChangedEventArgs args)
        {
            var call = sender as CommunicationCall;

            if (call != null)
            {
                var state = call.State;

                // Update the UI

                switch (state)
                {
                    case CallState.Connected:
                        {
                            await call.StartAudioAsync(micStream);

                            break;
                        }
                    case CallState.Disconnected:
                        {
                            call.StateChanged -= OnStateChangedAsync;

                            call.Dispose();

                            break;
                        }
                    default: break;
                }
            }
        }

讓通話按鈕正常運作

一旦 Callee ID 不是 Null 或空白，您就可以開始通話。

您必須使用 OnStateChangedAsync 動作來變更呼叫狀態。

    private async void CallButton_Click(object sender, RoutedEventArgs e)
    {
        var callString = CalleeTextBox.Text.Trim();

        if (!string.IsNullOrEmpty(callString))
        {
            call = await StartCallAsync(callString);

            call.StateChanged += OnStateChangedAsync;
        }
    
        
    }

執行程式碼

在 Visual Studio 中，您可以建置並執行程式碼。 針對解決方案平台，我們支援 ARM64、x64 和 x86。

若要進行撥出通話，請在文字欄位中提供使用者標識碼，然後按兩下 [ 開始通話/加入 ] 按鈕。 呼叫 8:echo123 會與回聲機器人通話。 使用這項功能來開始使用並確認您的音訊裝置是否正常運作。

WinUI 3

您可以從 GitHub 在 呼叫適用於 Windows 的 SDK 下載範例應用程式。

先決條件

若要完成本教學課程，您需要下列必要條件：

• 具有有效訂用帳戶的 Azure 帳戶。 免費建立帳戶。

• 安裝 Visual Studio 2022 和 Windows App SDK 1.3 版。

• 如何建立 WinUI 3 應用程式的基礎知識。 建立您的第一個 WinUI 3 (Windows App SDK) 專案是一個很好的入門資源。

• 已部署通訊服務資源。 建立通訊服務資源。 您必須針對此快速入門記錄您的連接字串。

• 針對您的 Azure 通訊服務的使用者存取權杖。 您也可以使用 Azure CLI，並搭配您的連接字串執行命令，以建立使用者和存取權杖。

  az communication identity token issue --scope voip --connection-string "yourConnectionString"
  

  如需詳細資訊，請參閱使用 Azure CLI 建立和管理存取權杖。

設定

建立專案

在 Visual Studio 中，使用 [已封裝的空白應用程式 (WinUI 3 in Desktop)] 範本建立新專案，以設定單頁 WinUI 3 應用程式。

安裝套件

以滑鼠右鍵選取您的專案，然後移至 Manage Nuget Packages，以安裝 Azure.Communication.Calling.WindowsClient1.2.0-beta.1 或更高版本。 請確定已選取 [包含發行前版本]。

要求存取

設定應用程式架構

設定基本配置來附加邏輯。 若要撥打外部電話，我們需要 TextBox 來提供被呼叫者的使用者 ID。 我們也需要 [Start/Join call] 按鈕和 [Hang up] 按鈕。 我們在這個範例中包含 Mute 和 BackgroundBlur 複選框，以示範音訊狀態和視訊效果的切換功能。

開啟專案的 MainPage.xaml，並將 Grid 節點新增至 Page：

設定基本配置來附加邏輯。 若要撥打外部電話，我們需要 TextBox 來提供被呼叫者的使用者 ID。 我們也需要 [Start Call] 按鈕和 [Hang Up] 按鈕。 開啟專案的 MainPage.xaml，並將 Grid 節點新增至 Page：

<Page
    x:Class="CallingQuickstart.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:CallingQuickstart"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="16*"/>
            <RowDefinition Height="30*"/>
            <RowDefinition Height="200*"/>
            <RowDefinition Height="60*"/>
            <RowDefinition Height="16*"/>
        </Grid.RowDefinitions>
        <TextBox Grid.Row="1" x:Name="CalleeTextBox" PlaceholderText="Who would you like to call?" TextWrapping="Wrap" VerticalAlignment="Center" Height="30" Margin="10,10,10,10" />

        <Grid Grid.Row="2">
            <Grid.RowDefinitions>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <MediaPlayerElement x:Name="LocalVideo" HorizontalAlignment="Center" Stretch="UniformToFill" Grid.Column="0" VerticalAlignment="Center" AutoPlay="True" />
            <MediaPlayerElement x:Name="RemoteVideo" HorizontalAlignment="Center" Stretch="UniformToFill" Grid.Column="1" VerticalAlignment="Center" AutoPlay="True" />
        </Grid>
        <StackPanel Grid.Row="3" Orientation="Vertical" Grid.RowSpan="2">
            <StackPanel Orientation="Horizontal">
                <Button x:Name="CallButton" Content="Start/Join call" Click="CallButton_Click" VerticalAlignment="Center" Margin="10,0,0,0" Height="40" Width="123"/>
                <Button x:Name="HangupButton" Content="Hang up" Click="HangupButton_Click" VerticalAlignment="Center" Margin="10,0,0,0" Height="40" Width="123"/>
                <CheckBox x:Name="MuteLocal" Content="Mute" Margin="10,0,0,0" Click="MuteLocal_Click" Width="74"/>
            </StackPanel>
        </StackPanel>
        <TextBox Grid.Row="5" x:Name="Stats" Text="" TextWrapping="Wrap" VerticalAlignment="Center" Height="30" Margin="0,2,0,0" BorderThickness="2" IsReadOnly="True" Foreground="LightSlateGray" />
    </Grid>
</Page>

開啟 MainPage.xaml.cs 並將內容取代為下列實作：

using Azure.Communication.Calling.WindowsClient;
using Microsoft.UI;
using Microsoft.UI.Windowing;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Navigation;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Windows.ApplicationModel;
using Windows.Media.Core;
using WinRT.Interop;

namespace CallingQuickstart
{
    public sealed partial class MainPage : Page
    {
        private const string authToken = "<AUTHENTICATION_TOKEN>";

        private CallClient callClient;
        private CallTokenRefreshOptions callTokenRefreshOptions = new CallTokenRefreshOptions(false);
        private CallAgent callAgent;
        private CommunicationCall call;

        private LocalOutgoingAudioStream micStream;
        private LocalOutgoingVideoStream cameraStream;

        #region Page initialization
        public MainPage()
        {
            this.InitializeComponent();
            // Additional UI customization code goes here
        }

        protected override async void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
        }
        #endregion

        #region UI event handlers
        private async void CallButton_Click(object sender, RoutedEventArgs e)
        {
            // Start a call
        }

        private async void HangupButton_Click(object sender, RoutedEventArgs e)
        {
            // Hang up a call
        }

        private async void MuteLocal_Click(object sender, RoutedEventArgs e)
        {
            // Toggle mute/unmute audio state of a call
        }
        #endregion

        #region API event handlers
        private async void OnIncomingCallAsync(object sender, IncomingCallReceivedEventArgs args)
        {
            // Handle incoming call event
        }

        private async void OnStateChangedAsync(object sender, PropertyChangedEventArgs args)
        {
            // Handle connected and disconnected state change of a call
        }
        #endregion
    }
}

物件模型

下方列出類別和介面的表格會處理 Azure 通訊服務通話 SDK 的一些主要功能：

名稱	描述
CallClient	CallClient 是通話 SDK 的主要進入點。
CallAgent	使用CallAgent來啟動和管理通話。
CommunicationCall	使用 CommunicationCall 來管理進行中的呼叫。
CallTokenCredential	使用CallTokenCredential作為權杖憑證來實例化CallAgent。
CallIdentifier	使用 CallIdentifier 來表示使用者的身分識別，它可以是下列其中一個選項： UserCallIdentifier、 PhoneNumberCallIdentifier等等。

驗證用戶端

使用使用者存取權杖來初始化 CallAgent 執行個體，讓我們能夠撥打和接收通話。 您也可以選擇性地取得 DeviceManager 實例，以查詢用戶端裝置組態。

在程式碼中，將 <AUTHENTICATION_TOKEN> 取代為使用者存取權杖。 如果您還沒有可用的令牌，請參閱 使用者存取令牌。

新增函 InitCallAgentAndDeviceManagerAsync 式，以啟動 SDK。 您可以自定義此協助程式，以符合應用程式的需求。

        private async Task InitCallAgentAndDeviceManagerAsync()
        {
            this.callClient = new CallClient(new CallClientOptions() {
                Diagnostics = new CallDiagnosticsOptions() { 
                    AppName = "CallingQuickstart",
                    AppVersion="1.0",
                    Tags = new[] { "Calling", "ACS", "Windows" }
                    }
                });

            // Set up local video stream using the first camera enumerated
            var deviceManager = await this.callClient.GetDeviceManagerAsync();
            var camera = deviceManager?.Cameras?.FirstOrDefault();
            var mic = deviceManager?.Microphones?.FirstOrDefault();
            micStream = new LocalOutgoingAudioStream();

            var tokenCredential = new CallTokenCredential(authToken, callTokenRefreshOptions);

            var callAgentOptions = new CallAgentOptions()
            {
                DisplayName = $"{Environment.MachineName}/{Environment.UserName}",
            };

            this.callAgent = await this.callClient.CreateCallAgentAsync(tokenCredential, callAgentOptions);
            this.callAgent.IncomingCallReceived += OnIncomingCallAsync;
        }

開始通話

將 實作新增至 CallButton_Click ，以使用 callAgent 我們建立的對象啟動各種呼叫。 將RemoteParticipantsUpdated和StateChanged事件處理程式連結到CommunicationCall物件上。

        private async void CallButton_Click(object sender, RoutedEventArgs e)
        {
            var callString = CalleeTextBox.Text.Trim();

            call = await StartCallAsync(callString);
            if (call != null)
            {
                call.StateChanged += OnStateChangedAsync;
            }
        }

結束通話

當使用者按兩下 [停止回應 ] 按鈕時，結束目前的通話。 將 實作新增至 HangupButton_Click 以結束呼叫，並停止預覽和視訊串流。

        private async void HangupButton_Click(object sender, RoutedEventArgs e)
        {
            var call = this.callAgent?.Calls?.FirstOrDefault();
            if (call != null)
            {
                await call.HangUpAsync(new HangUpOptions() { ForEveryone = false });
            }
        }

在音訊上切換靜音/取消靜音

按兩下 [Mute] 按鈕時，可將傳出音訊設為靜音。 將實作新增至 MuteLocal_Click 以將呼叫設為靜音。

        private async void MuteLocal_Click(object sender, RoutedEventArgs e)
        {
            var muteCheckbox = sender as CheckBox;

            if (muteCheckbox != null)
            {
                var call = this.callAgent?.Calls?.FirstOrDefault();
                if (call != null)
                {
                    if ((bool)muteCheckbox.IsChecked)
                    {
                        await call.MuteOutgoingAudioAsync();
                    }
                    else
                    {
                        await call.UnmuteOutgoingAudioAsync();
                    }
                }

                // Update the UI to reflect the state
            }
        }

自訂通話

使用 StartCallOptions 來設定音訊和視訊，以符合通話案例的需求。

        private StartCallOptions GetStartCallOptions()
        {
            var startCallOptions = startCallOptions = new StartCallOptions() {
                    OutgoingAudioOptions = new OutgoingAudioOptions() { IsMuted = true, Stream = micStream  },
                    OutgoingVideoOptions = new OutgoingVideoOptions() { Streams = new OutgoingVideoStream[] { cameraStream } }
                };
            
            return startCallOptions;
        }

在會議加入案例中，您可以使用 JoinCallOptions 來自訂音訊和視訊通話體驗。

        private JoinCallOptions GetJoinCallOptions()
        {
            return new JoinCallOptions() {
                OutgoingAudioOptions = new OutgoingAudioOptions() { IsMuted = true },
                OutgoingVideoOptions = new OutgoingVideoOptions() { Streams = new OutgoingVideoStream[] { cameraStream } }
            };
        }

啟動呼叫

取得 StartCallOptions之後，您可以使用CallAgent 來起始 Azure 通訊服務呼叫：

        private async Task<CommunicationCall> StartCallAsync(string acsCallee)
        {
            var options = new StartCallOptions();
            var call = await this.callAgent.StartCallAsync( new [] { new UserCallIdentifier(acsCallee) }, options);
            return call;
        }

接聽來電

IncomingCallReceived 事件接收設定於 SDK 啟動程序協助程式 InitCallAgentAndDeviceManagerAsync 中。

    this.callAgent.IncomingCallReceived += OnIncomingCallAsync;

您可以使用應用程式來設定應如何接受來電，例如視訊和音訊串流類型。

        private async void OnIncomingCallAsync(object sender, IncomingCallReceivedEventArgs args)
        {
            var incomingCall = args.IncomingCall;

            var acceptCallOptions = new AcceptCallOptions() { };

            call = await incomingCall.AcceptAsync(acceptCallOptions);
            call.StateChanged += OnStateChangedAsync;
        }

監視和回應通話狀態變更事件

當進行中的通話從一種狀態異動為另一種狀態時，就會引發 StateChanged 物件上的 CommunicationCall 事件。 應用程式有機會反映 UI 上的狀態變更，或插入商務邏輯。

        private async void OnStateChangedAsync(object sender, PropertyChangedEventArgs args)
        {
            var call = sender as CommunicationCall;

            if (call != null)
            {
                var state = call.State;

                // Update the UI

                switch (state)
                {
                    case CallState.Connected:
                        {
                            await call.StartAudioAsync(micStream);

                            break;
                        }
                    case CallState.Disconnected:
                        {
                            call.StateChanged -= OnStateChangedAsync;

                            call.Dispose();

                            break;
                        }
                    default: break;
                }
            }
        }

執行程式碼

在 Visual Studio 中，您可以建置並執行程式碼。 針對解決方案平台，我們支援 ARM64、x64 和 x86。

您可以在文字欄位中提供使用者識別碼，然後按兩下 [開始通話] 按鈕，以進行 輸出通話 。 呼叫 8:echo123 會與回聲機器人通話。 使用這項功能來開始使用，並確認您的音訊裝置是否正常運作。

本文說明如何使用適用於 JavaScript 的 Azure 通訊服務通話 SDK 來啟動呼叫。

範例程式碼

您可以從 GitHub 下載範例應用程式，在 將一對一語音通話功能添加到您的應用程式中。

附註

使用 Azure 通訊服務介面庫取得對 Azure 通訊服務使用者的外撥通話。 此 UI 程式庫讓開發人員只需使用幾行程式碼，就能將已啟用 VoIP 的通話用戶端新增至其應用程式中。

先決條件

• 具有有效訂用帳戶的 Azure 帳戶。 免費建立帳戶。

• 您必須有 Node.js 18。 您可以使用 msi 安裝程式進行安裝。

• 使用中的通訊服務資源。 建立通訊服務資源。 您必須針對此快速入門記錄您的連接字串。

• 用來具現化通話用戶端的使用者存取權杖。 了解如何建立和管理使用者存取權杖。 您也可以使用 Azure CLI，並搭配您的連接字串執行命令，以建立使用者和存取權杖。

  az communication identity token issue --scope voip --connection-string "yourConnectionString"
  

  如需詳細資訊，請參閱使用 Azure CLI 建立和管理存取權杖。

設定

建立新的 Node.js 應用程式

開啟您的終端機或命令視窗，為您的應用程式建立新的目錄，並瀏覽至該目錄。

mkdir calling-quickstart
cd calling-quickstart

執行 npm init -y 以使用預設設定建立 package.json 檔案。

npm init -y

安裝套件

使用 npm install 命令，以安裝適用於 JavaScript 的 Azure 通訊服務通話 SDK。

npm install @azure/communication-common --save
npm install @azure/communication-calling --save

--save 選項會在您的 package.json 檔案中，將程式庫列為相依性。

設定應用程式架構

本文使用webpack來組合應用程式資產。 執行下列命令來安裝 webpack、 webpack-cli和 webpack-dev-server npm 套件，並將其列為您 package.json中的開發相依性：

npm install copy-webpack-plugin@^11.0.0 webpack@^5.88.2 webpack-cli@^5.1.4 webpack-dev-server@^4.15.1 --save-dev

以下是您需要新增至index.html檔案的HTML：

<!DOCTYPE html>
<html>
  <head>
    <title>Communication Client - Calling Sample</title>
  </head>
  <body>
    <h4>Azure Communication Services</h4>
    <h1>Calling Quickstart</h1>
    <input 
      id="token-input"
      type="text"
      placeholder="User access token"
      style="margin-bottom:1em; width: 200px;"
    />
    </div>
    <button id="token-submit" type="button">
        Submit
    </button>
    <input 
      id="callee-id-input"
      type="text"
      placeholder="Who would you like to call?"
      style="margin-bottom:1em; width: 200px; display: block;"
    />
    <div>
      <button id="call-button" type="button" disabled="true">
        Start Call
      </button>
      &nbsp;
      <button id="accept-call-button" type="button" disabled="true">
        Accept Call
      </button>
      &nbsp;
      <button id="hang-up-button" type="button" disabled="true">
        Hang Up
      </button>
    </div>
    <script src="./main.js"></script>
  </body>
</html>

在專案的根目錄中建立名為 index.js 的檔案，以包含本快速入門的應用程式邏輯。 新增下列程式碼以匯入通話用戶端，並取得 DOM 元素的參考，以便可以附加我們的商務邏輯。

import { CallClient } from "@azure/communication-calling";
import { AzureCommunicationTokenCredential } from '@azure/communication-common';

let call;
let incomingCall;
let callAgent;
let deviceManager;
let tokenCredential;
const userToken = document.getElementById("token-input"); 
const calleeInput = document.getElementById("callee-id-input");
const submitToken = document.getElementById("token-submit");
const callButton = document.getElementById("call-button");
const hangUpButton = document.getElementById("hang-up-button");
const acceptCallButton = document.getElementById('accept-call-button');

物件模型

下列類別和介面會處理 Azure 通訊服務通話 SDK 的一些重大功能：

名稱	描述
CallClient	CallClient 是通話 SDK 的主要進入點。
CallAgent	使用CallAgent來啟動和管理通話。
AzureCommunicationTokenCredential	使用 類別 AzureCommunicationTokenCredential 來實 CommunicationTokenCredential 作 介面，以具現化 CallAgent。

驗證用戶端

您必須在文字欄位中輸入資源的有效使用者存取令牌，然後按兩下[ 提交]。 如果您還沒有可用的令牌，請參閱 使用者存取令牌。 使用 CallClient 來初始化 CallAgent 實例，CommunicationTokenCredential 以讓應用程式能進行和接收呼叫。

將下列程式碼新增至 app.js：

submitToken.addEventListener("click", async () => {
  const callClient = new CallClient();
  const userTokenCredential = userToken.value;
    try {
      tokenCredential = new AzureCommunicationTokenCredential(userTokenCredential);
      callAgent = await callClient.createCallAgent(tokenCredential);
      deviceManager = await callClient.getDeviceManager();
      await deviceManager.askDevicePermission({ audio: true });
      callButton.disabled = false;
      submitToken.disabled = true;
      // Listen for an incoming call to accept.
      callAgent.on('incomingCall', async (args) => {
        try {
          incomingCall = args.incomingCall;
          acceptCallButton.disabled = false;
          callButton.disabled = true;
        } catch (error) {
          console.error(error);
        }
      });
    } catch(error) {
      window.alert("Please submit a valid token!");
    }
})

開始通話

新增事件處理程式，以在使用者按兩下 callButton時起始呼叫：

callButton.addEventListener("click", () => {
  // start a call
  const userToCall = calleeInput.value;
  call = callAgent.startCall(
      [{ id: userToCall }],
      {}
  );
  // toggle button states
  hangUpButton.disabled = false;
  callButton.disabled = true;
});

結束通話

新增事件接聽程式，以在使用者按兩下 hangUpButton時結束目前的呼叫：

hangUpButton.addEventListener("click", () => {
  // end the current call
  // The `forEveryone` property ends the call for all call participants.
  call.hangUp({ forEveryone: true });

  // toggle button states
  hangUpButton.disabled = true;
  callButton.disabled = false;
  submitToken.disabled = false;
  acceptCallButton.disabled = true;
});

接聽來電

新增事件接聽程式，以接受 acceptCallButton 的撥入電話：

acceptCallButton.onclick = async () => {
  try {
    call = await incomingCall.accept();
    acceptCallButton.disabled = true;
    hangUpButton.disabled = false;
  } catch (error) {
    console.error(error);
  }
}

新增 Webpack 本機伺服器程式碼

在名為 webpack.config.js 的專案根目錄中建立檔案，以包含本快速入門的本地伺服器邏輯。 將下列程式碼新增至 webpack.config.js：

const path = require('path');
const CopyPlugin = require("copy-webpack-plugin");

module.exports = {
    mode: 'development',
    entry: './index.js',
    output: {
        filename: 'main.js',
        path: path.resolve(__dirname, 'dist'),
    },
    devServer: {
        static: {
            directory: path.join(__dirname, './')
        },
    },
    plugins: [
        new CopyPlugin({
            patterns: [
                './index.html'
            ]
        }),
    ]
};

執行程式碼

使用 npx webpack serve --config webpack.config.js 命令來執行您的應用程式。

開啟瀏覽器並瀏覽至 http://localhost:8080/. 您應該會看見下列畫面：

您可以在對應文字欄位中提供有效使用者存取權杖和使用者識別碼，並且按一下 [開始通話] 按鈕，以向外撥打 VOIP 通話。

呼叫 8:echo123 會連接您至回聲機器人，讓您開始使用並確認您的音訊設備正常運作。 傳遞 {id: '8:echo123'} 至 CallAgent.startCall() API 以呼叫 Echo Bot。

若要呼叫 Azure 通訊服務通訊使用者，請將 {communicationUserId: 'ACS_USER_ID'} 傳遞至 CallAgent.startCall() API。

本文說明如何使用適用於 Android 的 Azure 通訊服務通話 SDK 來啟動通話。

範例程式碼

您可以在將 語音通話新增至 Android 應用程式時，從 GitHub 下載範例應用程式。

先決條件

• 具有有效訂用帳戶的 Azure 帳戶。 免費建立帳戶。

• Android Studio，用於建立 Android 應用程式。

• 已部署通訊服務資源。 建立通訊服務資源。 您需要為本文記錄您的 連接字串。

• 針對您的 Azure 通訊服務的使用者存取權杖。 您也可以使用 Azure CLI，並搭配您的連接字串執行命令，以建立使用者和存取權杖。

  az communication identity token issue --scope voip --connection-string "yourConnectionString"
  

  如需詳細資訊，請參閱使用 Azure CLI 建立和管理存取權杖。

設定

建立具有空白活動的 Android 應用程式

從 Android Studio 中，選取 [ 啟動新的 Android Studio 專案]。

在[手機和平板]之下，選擇[空白檢視活動]專案範本。

選擇 API 26：Android 8.0（Oreo） 的最低 SDK 或更新版本。

安裝套件

找出您的專案 settings.gradle.kts，並務必在 mavenCentral() 和 pluginManagement 下的存放庫清單看到 dependencyResolutionManagement

pluginManagement {
    repositories {
    ...
        mavenCentral()
    ...
    }
}

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
    ...
        mavenCentral()
    }
}

然後，在模組層級 build.gradle 中，將下列幾行新增至相依性和 android 區段：

android {
    ...
    
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    ...
    implementation ("com.azure.android:azure-communication-calling:2.6.0")
    ...
}

將權限新增至應用程式資訊清單

若要要求呼叫所需的許可權，必須在應用程式指令清單 （app/src/main/AndroidManifest.xml） 中宣告這些許可權。 使用下列程式碼取代檔案內容：

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.contoso.acsquickstart">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <!--Our Calling SDK depends on the Apache HTTP SDK.
When targeting Android SDK 28+, this library needs to be explicitly referenced.
See https://developer.android.com/about/versions/pie/android-9.0-changes-28#apache-p-->
        <uses-library android:name="org.apache.http.legacy" android:required="false"/>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
    

設定應用程式的配置

需要兩個輸入：被呼叫者識別碼的文字輸入，以及用來進行呼叫的按鈕。 這些輸入可以透過設計工具或藉由編輯版面配置 xml 來新增。 建立識別碼為 call_button、文字輸入為 callee_id 的按鈕。 瀏覽至 app/src/main/res/layout/activity_main.xml 並且以下列程式碼取代檔案的內容：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/call_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:text="Call"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <EditText
        android:id="@+id/callee_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="Callee Id"
        android:inputType="textPersonName"
        android:minHeight="48dp"
        app:layout_constraintBottom_toTopOf="@+id/call_button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

建立主要活動 Scaffolding 和繫結

完成配置後，即可新增繫結，以及活動的基本 Scaffolding。 活動會處理要求執行階段權限、建立通話代理程式，並且在按下按鈕時進行通話。 每個項目都涵蓋在自己的區段中。 系統會覆寫 onCreate 方法以叫用 getAllPermissions 和 createAgent，並新增呼叫按鈕的繫結。 此事件只會在建立活動時發生一次。 如需 詳細資訊，請參閱 onCreate瞭解活動生命週期。

瀏覽至 MainActivity.java，然後以下列程式碼取代內容：

package com.contoso.acsquickstart;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import android.media.AudioManager;
import android.Manifest;
import android.content.pm.PackageManager;

import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.azure.android.communication.common.CommunicationUserIdentifier;
import com.azure.android.communication.common.CommunicationTokenCredential;
import com.azure.android.communication.calling.CallAgent;
import com.azure.android.communication.calling.CallClient;
import com.azure.android.communication.calling.StartCallOptions;


import java.util.ArrayList;
import java.util.Arrays;

public class MainActivity extends AppCompatActivity {
    
    private CallAgent callAgent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getAllPermissions();
        createAgent();
        
        // Bind call button to call `startCall`
        Button callButton = findViewById(R.id.call_button);
        callButton.setOnClickListener(l -> startCall());
        
        setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);
    }

    /**
     * Request each required permission if the app doesn't already have it.
     */
    private void getAllPermissions() {
        // See section on requesting permissions
    }

    /**
      * Create the call agent for placing calls
      */
    private void createAgent() {
        // See section on creating the call agent
    }

    /**
     * Place a call to the callee id provided in `callee_id` text input.
     */
    private void startCall() {
        // See section on starting the call
    }
}

要求執行階段時的權限

針對 Android 6.0 和更新版本 (API 層級 23) 和 targetSdkVersion 23 或更新版本，權限會在執行階段授與，而不是在安裝應用程式時。 為了提供支援，可實作 getAllPermissions，針對每個必要的權限呼叫 ActivityCompat.checkSelfPermission 和 ActivityCompat.requestPermissions。

/**
 * Request each required permission if the app doesn't already have it.
 */
private void getAllPermissions() {
    String[] requiredPermissions = new String[]{android.Manifest.permission.RECORD_AUDIO, android.Manifest.permission.CAMERA, android.Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_PHONE_STATE};

    ArrayList<String> permissionsToAskFor = new ArrayList<>();

    for (String permission : requiredPermissions) {
        if (ActivityCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
            permissionsToAskFor.add(permission);
        }
    }

    if (!permissionsToAskFor.isEmpty()) {
        ActivityCompat.requestPermissions(this, permissionsToAskFor.toArray(new String[0]), 1);
    }
}

附註

在設計您的應用程式時，請考量何時應要求這些權限。 應視需要要求許可權，而不是事先要求。 如需詳細資訊，請參閱 Android 許可權。

物件模型

下列類別和介面會處理 Azure 通訊服務通話 SDK 的一些重大功能：

名稱	描述
allClient	CallClient 是通話 SDK 的主要進入點。
CallAgent	使用CallAgent來啟動和管理通話。
CommunicationTokenCredential	使用CommunicationTokenCredential作為權杖憑證來實例化CallAgent。
CommunicationIdentifier	使用 CommunicationIdentifier 來標識可能參加通話的不同類型參與者。

從使用者存取權杖建立代理程式

透過使用者權杖，可以將已驗證的呼叫代理程式具現化。 此令牌是從具有應用程式特定驗證的服務產生。 如需詳細資訊，請參閱 使用者存取令牌。

在本文中，將 <User_Access_Token> 替換為您為 Azure 通訊服務資源生成的使用者存取令牌。

/**
 * Create the call agent for placing calls
 */
private void createAgent() {
    String userToken = "<User_Access_Token>";

    try {
            CommunicationTokenCredential credential = new CommunicationTokenCredential(userToken);
            callAgent = new CallClient().createCallAgent(getApplicationContext(), credential).get();
    } catch (Exception ex) {
        Toast.makeText(getApplicationContext(), "Failed to create call agent.", Toast.LENGTH_SHORT).show();
    }
}

使用呼叫代理程式開始通話

您可以透過通話代理程式撥打電話，這需要提供被呼叫端標識碼和通話選項的清單。 本文使用預設通話選項，而不使用來自文字輸入的視訊和單一被呼叫者標識符。

/**
 * Place a call to the callee id provided in `callee_id` text input.
 */
private void startCall() {
    EditText calleeIdView = findViewById(R.id.callee_id);
    
    String calleeId = calleeIdView.getText().toString();

    StartCallOptions options = new StartCallOptions();

    callAgent.startCall(
            getApplicationContext(),
            Arrays.asList(new CommunicationUserIdentifier[]{new CommunicationUserIdentifier(calleeId)}),
            options);
}

啟動應用程式並呼叫 Echo Bot

您可以使用工具列上的 [ 執行應用程式 ] 按鈕來啟動應用程式（Shift+F10）。 藉由呼叫 8:echo123 來確認您可以撥打通話。 預先錄製的訊息會播放，然後將您的訊息重複回傳給您。

本文說明如何使用適用於 iOS 的 Azure 通訊服務通話 SDK 來啟動通話。

範例程式碼

您可以從 GitHub 下載名為iOS 版呼叫 SDK的範例應用程式。

先決條件

若要完成本教學課程，您需要下列必要條件：

• 具有有效訂用帳戶的 Azure 帳戶。 免費建立帳戶。

• 執行 Xcode 的 Mac，以及安裝在您 Keychain 中的有效開發人員憑證。

• 已部署通訊服務資源。 建立通訊服務資源。 您必須針對此快速入門記錄您的連接字串。

• 針對您的 Azure 通訊服務的使用者存取權杖。 您也可以使用 Azure CLI，並搭配您的連接字串執行命令，以建立使用者和存取權杖。

  az communication identity token issue --scope voip --connection-string "yourConnectionString"
  

  如需詳細資訊，請參閱使用 Azure CLI 建立和管理存取權杖。

設定

建立 XCode 專案

在 Xcode 中建立新的 iOS 專案，並選取 [應用程式] 範本。 本教學課程使用 SwiftUI 架構，因此您應將 [語言] 設定為 [Swift]，並將 [使用者介面] 設定為 [SwiftUI]。 進行本快速入門期間，您不會建立測試。 您可以取消核取 [包含測試]。

使用 CocoaPods 安裝套件和相依性

1. 若要為應用程式建立 Podfile，請開啟終端，然後瀏覽至專案資料夾並執行：

   pod init

2. 將下列程式碼新增至 Podfile 並儲存 (請確定 "target" 與您專案的名稱相符)：

   platform :ios, '13.0'
   use_frameworks!
   
   target 'AzureCommunicationCallingSample' do
     pod 'AzureCommunicationCalling', '~> 1.0.0'
   end
   

3. 執行 pod install。

4. 使用 Xcode 開啟 .xcworkspace。

要求存取麥克風

您必須以 NSMicrophoneUsageDescription 更新應用程式的資訊屬性清單，才能存取裝置的麥克風。 您可以將相關聯的值設定為 string，此值會包含在系統用來向使用者要求存取權的對話中。

以滑鼠右鍵按一下專案樹狀結構的 Info.plist 項目，然後選取 [開啟形式]> [原始程式碼]。 將以下幾行新增至最上層 <dict> 區段中，然後儲存檔案。

<key>NSMicrophoneUsageDescription</key>
<string>Need microphone access for VOIP calling.</string>

設定應用程式架構

開啟專案的 ContentView.swift 檔案，並且將 import 宣告新增至檔案頂端，以匯入 AzureCommunicationCalling library。 此外，匯入 AVFoundation，我們需要此程式碼以便在程式碼中進行音訊權限要求。

import AzureCommunicationCalling
import AVFoundation

使用一些簡單的 UI 控制項來取代 ContentView 結構的實作，讓使用者可以起始和結束通話。 在本快速入門中，我們會將商務邏輯附加至這些控制項。

struct ContentView: View {
    @State var callee: String = ""
    @State var callClient: CallClient?
    @State var callAgent: CallAgent?
    @State var call: Call?

    var body: some View {
        NavigationView {
            Form {
                Section {
                    TextField("Who would you like to call?", text: $callee)
                    Button(action: startCall) {
                        Text("Start Call")
                    }.disabled(callAgent == nil)
                    Button(action: endCall) {
                        Text("End Call")
                    }.disabled(call == nil)
                }
            }
            .navigationBarTitle("Calling Quickstart")
        }.onAppear {
            // Initialize call agent
        }
    }

    func startCall() {
        // Ask permissions
        AVAudioSession.sharedInstance().requestRecordPermission { (granted) in
            if granted {
                // Add start call logic
            }
        }
    }

    func endCall() {
        // Add end call logic
    }
}

物件模型

下列類別和介面會處理 Azure 通訊服務通話 SDK 的一些重大功能：

名稱	描述
CallClient	CallClient 是通話 SDK 的主要進入點。
CallAgent	CallAgent 可用來開始和管理通話。
CommunicationTokenCredential	CommunicationTokenCredential 可作為權杖認證以將 CallAgent 具現化。
CommunicationUserIdentifier	CommunicationUserIdentifier用來代表使用者的身分識別，它可以是下列其中一個選項：CommunicationUserIdentifier、PhoneNumberIdentifier或CallingApplication.

驗證用戶端

使用使用者存取權杖來初始化 CallAgent 執行個體，讓我們能夠進行和接收通話。

在下列程式碼中，您必須將 <USER ACCESS TOKEN> 取代為資源的有效使用者存取權杖。 如果您還沒有可用的權杖，請參閱使用者存取權杖文件。

將下列程式碼新增至 onAppear 中的 回撥：

var userCredential: CommunicationTokenCredential?
do {
    userCredential = try CommunicationTokenCredential(token: "<USER ACCESS TOKEN>")
} catch {
    print("ERROR: It was not possible to create user credential.")
    return
}

self.callClient = CallClient()

// Creates the call agent
self.callClient?.createCallAgent(userCredential: userCredential!) { (agent, error) in
    if error != nil {
        print("ERROR: It was not possible to create a call agent.")
        return
    }
    else {
        self.callAgent = agent
        print("Call agent successfully created.")
    }
}

開始通話

startCall 方法會設定為點選 [開始通話] 按鈕時要執行的動作。 更新此實作，以使用 ASACallAgent 開始通話：

func startCall()
{
    // Ask permissions
    AVAudioSession.sharedInstance().requestRecordPermission { (granted) in
        if granted {
            // start call logic
            let callees:[CommunicationIdentifier] = [CommunicationUserIdentifier(self.callee)]
            self.callAgent?.startCall(participants: callees, options: StartCallOptions()) { (call, error) in
                if (error == nil) {
                    self.call = call
                } else {
                    print("Failed to get call object")
                }
            }
        }
    }
}

您也可以使用 StartCallOptions 中的屬性來設定通話的初始選項 (也就是允許在麥克風靜音的情況下開始通話)。

結束通話

當點選 [結束通話]endCall 按鈕時，請實作 方法來結束目前的通話。

func endCall()
{    
    self.call!.hangUp(options: HangUpOptions()) { (error) in
        if (error != nil) {
            print("ERROR: It was not possible to hangup the call.")
        }
    }
}

執行程式碼

您可以藉由選取 [產品]> [執行] 或使用 (⌘-R) 鍵盤快速鍵，在 iOS 模擬器上建置並執行應用程式。

您可以在文字欄位中提供使用者識別碼並且點選 [開始通話] 按鈕，以進行外撥 VOIP 通話。 呼叫 8:echo123，會將您連線到回應聊天機器人，此功能非常適合入門，以及驗證您的音訊裝置運作正常。

附註

第一次撥打電話時，系統會提示您存取麥克風。 在生產應用程式中，您應該使用 AVAudioSession API 來 檢查許可權狀態， 並在未授與許可權時正常更新應用程式的行為。

本文說明如何使用適用於 Unity 的 Azure 通訊服務通話 SDK 來啟動通話。

您可以在 呼叫適用於 .NET 的 SDK 上，從 GitHub 下載範例應用程式。

這很重要

此 Azure 通訊服務功能目前處於預覽狀態。 預覽中的功能可供公開使用，而且可供所有新的和現有的Microsoft客戶使用。

此預覽版本沒有服務等級協定，不建議用於處理生產工作負載。 某些功能可能不受支援，或功能可能會受到限制。

如需詳細資訊，請參閱 Microsoft Azure 預覽版增補使用條款。

先決條件

• 具有有效訂用帳戶的 Azure 帳戶。 免費建立帳戶。

• 安裝包含通用 Windows 平台開發工作負載的 Unity Hub 和 Unity 編輯器 \(英文\)。

• 已部署通訊服務資源。 建立通訊服務資源。 您必須針對此快速入門記錄您的連接字串。

• 針對您的 Azure 通訊服務的使用者存取權杖。 您也可以使用 Azure CLI，並搭配您的連接字串執行命令，以建立使用者和存取權杖。

  az communication identity token issue --scope voip --connection-string "yourConnectionString"
  

  如需詳細資訊，請參閱使用 Azure CLI 建立和管理存取權杖。

設定

建立專案

在 Unity Hub 中，使用 2D 核心範本來建立新專案，以設定 Unity 專案。

安裝套件

有兩種方式可以安裝適用於 Unity 的 Azure 通訊通話 SDK。

1. 從公用 npm 摘要下載 SDK \(英文\)，並將其匯入到 Unity 編輯器的套件管理員，其位於 Windows 索引標籤底下。

2. 從 Microsoft 下載混合實境功能工具，並透過混合實境工具管理員進行安裝。

設定應用程式架構

我們必須設定基本配置來附加邏輯。 為了撥打外撥電話，我們需要 TextBox 來提供被通話者的使用者識別碼。 我們也需要 [Start/Join call] 按鈕和 [Hang up] 按鈕。

在專案中建立名為 Main 的新場景。

開啟 Main.unity 檔案，然後使用下列實作取代內容：

Main.Unity 程式碼

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建立名為 AppManager.cs 的指令碼，並將其連結至 Unity 編輯器中的 AppManager 物件。 使用下列實作取代內容：

using Azure.Communication.Calling.UnityClient;
using System.Runtime.InteropServices.ComTypes;
using System;
using UnityEngine;
using System.Linq;
using UnityEngine.UI;
using UnityEngine.Video;
using TMPro;

/// <summary>
/// A singleton which hosts an Azure Communication calling client. This calling client 
/// is then shared across the application.
/// </summary>

public class AppManager : MonoBehaviour
{
    private CallClient callClient;
    private CallAgent callAgent;
    private DeviceManager deviceManager;
    private CommunicationCall call;
    private LocalOutgoingAudioStream micStream;

    public string CalleeIdentity { get; set; }

    public TMP_Text callStatus;

    public static AppManager Instance;

    private void Awake()
    {
        // start of new code
        if (Instance != null)
        {
            Destroy(gameObject);
            return;
        }
        // end of new code

        callClient = new CallClient();

        Instance = this;
        DontDestroyOnLoad(gameObject);

        InitCallAgentAndDeviceManagerAsync();
    }

    public async void CallButton_Click()
    {
        // Start a call
    }

    public async void HangupButton_Click()
    {
        // Hang up a call
    }

    private async void OnIncomingCallAsync(object sender, IncomingCallReceivedEventArgs args)
    {
        // Handle incoming call event
    }

    private void OnStateChangedAsync(object sender, Azure.Communication.Calling.UnityClient.PropertyChangedEventArgs args)
    {
        // Handle connected and disconnected state change of a call
    }

    //Used For Updating the UI
    private void Update()
    {
        if (call != null)
        {
            switch (call.State)
            {
                case CallState.Connected:
                    if (callStatus.text != "Connected")
                        callStatus.text = "Connected";
                    break;
                case CallState.Disconnected:
                    if (callStatus.text != "Disconnected")
                        callStatus.text = "Disconnected";
                    break;
            }
        }
    }
}

在名為 AppManager 的 GameObject 中，將新建立的指令碼拖曳到其指令碼元件中。 另外，將 [狀態] 文字物件拖曳至 [通話狀態] 文字欄位，以啟用通話狀態的 UI 更新。

物件模型

下方列出類別和介面的表格會處理 Azure 通訊服務通話 SDK 的一些主要功能：

名稱	描述
CallClient	CallClient 是通話 SDK 的主要進入點。
CallAgent	使用CallAgent來啟動和管理通話。
Call	使用 CommunicationCall 來管理進行中的呼叫。
CallTokenCredential	使用CallTokenCredential作為權杖憑證來實例化CallAgent。
CallIdentifier	使用 CallIdentifier 來表示使用者的身分識別，它可以是下列其中一個選項： UserCallIdentifier、 PhoneNumberCallIdentifier等等。

驗證用戶端

透過使用者存取權杖來將 CallAgent 執行個體初始化，此存取權杖可讓我們撥打和接聽通話，並選擇性地取得 DeviceManager 執行個體來查詢用戶端裝置設定。

在程式碼中，將 <AUTHENTICATION_TOKEN> 取代為使用者存取權杖。 如果您還沒有可用的令牌，請參閱 使用者存取令牌。

新增 InitCallAgentAndDeviceManagerAsync 函式，以啟動 SDK。 您可以自訂此協助程式，以符合應用程式的需求。

private async void InitCallAgentAndDeviceManagerAsync()
{

    deviceManager = await callClient.GetDeviceManager();

    var tokenCredential = new CallTokenCredential(<AUTHENTICATION_TOKEN>);

    var callAgentOptions = new CallAgentOptions()
    {
        DisplayName = $"{Environment.MachineName}/{Environment.UserName}",
    };

    callAgent = await callClient.CreateCallAgent(tokenCredential, callAgentOptions);
    callAgent.IncomingCallReceived += OnIncomingCallAsync;
}

啟動呼叫

取得 StartCallOptions 物件之後，即可使用 CallAgent 來起始 Azure 通訊服務通話：

public async void CallButton_Click()
{
    var startCallOptions = new StartCallOptions();
    startCallOptions = new StartCallOptions();

    var callee = new UserCallIdentifier(CalleeIdentity);

    call = await callAgent.StartCallAsync(new CallIdentifier[] { callee }, startCallOptions);
    // Set up handler for call StateChanged event
    call.StateChanged += OnStateChangedAsync;
}

結束通話

按兩下 [Hang up] 按鈕時，結束目前的通話。 將實作新增至 HangupButton_Click 以結束通話，並停止預覽和視訊串流。

public async void HangupButton_Click()
{
    if (call != null)
    {
        try
        {
            await call.HangUpAsync(new HangUpOptions() { ForEveryone = false });
        }
        catch (Exception ex)
        {
        }
    }
}

接聽來電

IncomingCallReceived 事件接收設定於 SDK 啟動程序協助程式 InitCallAgentAndDeviceManagerAsync 中。

callAgent.IncomingCallReceived += OnIncomingCallAsync;

應用程式有機會設定應如何接受來電，例如，視訊和音訊串流類型。

private async void OnIncomingCallAsync(object sender, IncomingCallReceivedEventArgs args)
{
    var incomingCall = args.IncomingCall;

    var acceptCallOptions = new AcceptCallOptions()
    {
        IncomingVideoOptions = new IncomingVideoOptions()
        {
            StreamKind = VideoStreamKind.RemoteIncoming
        }
    };

    call = await incomingCall.AcceptAsync(acceptCallOptions);
    // Set up handler for incoming call StateChanged event
    call.StateChanged += OnStateChangedAsync;
}

監視和回應通話狀態變更事件

當進行中的通話從一種狀態異動為另一種狀態時，就會引發 StateChanged 物件上的 Call 事件。 應用程式有機會反映 UI 上的狀態變更，或插入商務邏輯。

private async void OnStateChangedAsync(object sender, PropertyChangedEventArgs args)
{
    var call = sender as CommunicationCall;

    if (call != null)
    {
        var state = call.State;
        switch (state)
        {
            case CallState.Connected:
                {
                    await call.StartAudioAsync(micStream);

                    break;
                }
            case CallState.Disconnected:
                {
                    call.StateChanged -= OnStateChangedAsync;

                    call.Dispose();

                    break;
                }
            default: break;
        }
    }
}

執行程式碼

您可以在 Unity 編輯器或使用 Unity 的裝置上建置並執行程式碼。

您可以在文字欄位中提供使用者識別碼，並按一下 [Start Call/Join] 按鈕以向外撥打通話。 呼叫 8:echo123 會使用回應 Bot 來連線您，這項功能會啟動並驗證音訊裝置是否正常運作。

清除資源

如果您想要清除和移除通訊服務訂閱，則可以刪除資源或資源群組。 刪除資源群組也會刪除其關聯的任何其他資源。 深入了解如何清除資源。

後續步驟

• 查看我們的通話 Hero 範例
• 開始使用 UI 程式庫
• 了解通話 SDK 功能
• 深入了解通話的運作方式