IAudioSynthesis

src/Infrastructure/BotSharp.Abstraction/MLTasks/IAudioCompletion.cs

@@ -1,15 +0,0 @@
-using System.IO;
-
-namespace BotSharp.Abstraction.MLTasks;
-
-public interface IAudioCompletion
-{
-    string Provider { get; }
-
-    string Model { get; }
-
-    Task<string> GenerateTextFromAudioAsync(Stream audio, string audioFileName, string? text = null);
-    Task<BinaryData> GenerateAudioFromTextAsync(string text, string? voice = "alloy", string? format = "mp3");
-
-    void SetModelName(string model);
-}

src/Infrastructure/BotSharp.Abstraction/MLTasks/IAudioSynthesis.cs

@@ -0,0 +1,15 @@
+namespace BotSharp.Abstraction.MLTasks;
+
+/// <summary>
+/// Text to speech synthesis
+/// </summary>
+public interface IAudioSynthesis
+{
+    string Provider { get; }
+
+    string Model { get; }
+
+    void SetModelName(string model);
+
+    Task<BinaryData> GenerateAudioAsync(string text, string? voice = "alloy", string? format = "mp3", string? instructions = null);
+}

src/Infrastructure/BotSharp.Abstraction/MLTasks/IAudioTranscription.cs

@@ -0,0 +1,17 @@
+using System.IO;
+
+namespace BotSharp.Abstraction.MLTasks;
+
+/// <summary>
+/// Audio transcription service
+/// </summary>
+public interface IAudioTranscription
+{
+    string Provider { get; }
+
+    string Model { get; }
+
+    Task<string> TranscriptTextAsync(Stream audio, string audioFileName, string? text = null);
+
+    void SetModelName(string model);
+}

src/Infrastructure/BotSharp.Abstraction/MLTasks/Settings/LlmModelSetting.cs

@@ -3,14 +3,14 @@ namespace BotSharp.Abstraction.MLTasks.Settings;
 public class LlmModelSetting
 {
     /// <summary>
-    /// Model Id, like "gpt-3.5" and "gpt-4".
+    /// Model Id, like "gpt-4", "gpt-4o", "o1".
     /// </summary>
-    public string? Id { get; set; }
+    public string Id { get; set; } = null!;
 
     /// <summary>
     /// Deployment model name
     /// </summary>
-    public string Name { get; set; }
+    public string Name { get; set; } = null!;
 
     /// <summary>
     /// Model version
@@ -28,8 +28,8 @@ public class LlmModelSetting
     /// </summary>
     public string? Group { get; set; }
 
-    public string ApiKey { get; set; }
-    public string Endpoint { get; set; }
+    public string ApiKey { get; set; } = null!;
+    public string? Endpoint { get; set; }
     public LlmModelType Type { get; set; } = LlmModelType.Chat;
 
     /// <summary>

src/Infrastructure/BotSharp.Abstraction/Realtime/Models/ModelTurnDetection.cs

@@ -11,6 +11,6 @@ public class ModelTurnDetection
 
 public class AudioTranscription
 {
-    public string Model { get; set; } = "whisper-1";
-    public string Language { get; set; } = "en";
+    public string Model { get; set; } = "gpt-4o-mini-transcribe";
+    public string? Language { get; set; }
 }

src/Infrastructure/BotSharp.Core.Realtime/Services/RealtimeHub.cs

@@ -74,7 +74,7 @@ public class RealtimeHub : IRealtimeHub
         if (!model.Contains("-realtime-"))
         {
             var llmProviderService = _services.GetRequiredService<ILlmProviderService>();
-            model = llmProviderService.GetProviderModel("openai", "gpt-4", realTime: true).Name;
+            model = llmProviderService.GetProviderModel("openai", "gpt-4o", realTime: true).Name;
         }
 
         _completer.SetModelName(model);

src/Infrastructure/BotSharp.Core/Files/Services/Instruct/FileInstructService.Audio.cs

@@ -6,14 +6,14 @@ public partial class FileInstructService
 {
     public async Task<string> SpeechToText(string? provider, string? model, InstructFileModel audio, string? text = null)
     {
-        var completion = CompletionProvider.GetAudioCompletion(_services, provider: provider ?? "openai", model: model ?? "whisper-1");
+        var completion = CompletionProvider.GetAudioTranscriber(_services, provider: provider, model: model);
         var audioBytes = await DownloadFile(audio);
         using var stream = new MemoryStream();
         stream.Write(audioBytes, 0, audioBytes.Length);
         stream.Position = 0;
 
         var fileName = $"{audio.FileName ?? "audio"}.{audio.FileExtension ?? "wav"}";
-        var content = await completion.GenerateTextFromAudioAsync(stream, fileName, text);
+        var content = await completion.TranscriptTextAsync(stream, fileName, text);
         stream.Close();
         return content;
     }

src/Infrastructure/BotSharp.Core/Files/Services/Instruct/FileInstructService.Pdf.cs

@@ -27,7 +27,7 @@ public partial class FileInstructService
 
             var innerAgentId = agentId ?? Guid.Empty.ToString();
             var completion = CompletionProvider.GetChatCompletion(_services, provider: provider ?? "openai",
-                model: model, modelId: modelId ?? "gpt-4", multiModal: true);
+                model: model, modelId: modelId ?? "gpt-4o", multiModal: true);
             var message = await completion.GetChatCompletions(new Agent()
             {
                 Id = innerAgentId,

src/Infrastructure/BotSharp.Core/Files/Services/Instruct/FileInstructService.SelectFile.cs

@@ -93,7 +93,7 @@ public partial class FileInstructService
             }
 
             var providerName = options.Provider ?? "openai";
-            var modelId = options?.ModelId ?? "gpt-4";
+            var modelId = options?.ModelId ?? "gpt-4o";
             var provider = llmProviderService.GetProviders().FirstOrDefault(x => x == providerName);
             var model = llmProviderService.GetProviderModel(provider: provider, id: modelId);
             var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model.Name);

src/Infrastructure/BotSharp.Core/Infrastructures/CompletionProvider.cs

@@ -30,7 +30,7 @@ public class CompletionProvider
         }
         else if (settings.Type == LlmModelType.Audio)
         {
-            return GetAudioCompletion(services, provider: provider, model: model);
+            return GetAudioTranscriber(services, provider: provider, model: model);
         }
         else
         {
@@ -126,20 +126,39 @@ public class CompletionProvider
         return completer;
     }
 
-    public static IAudioCompletion GetAudioCompletion(
+    public static IAudioTranscription GetAudioTranscriber(
         IServiceProvider services,
-        string provider,
-        string model)
+        string? provider = null,
+        string? model = null)
     {
-        var completions = services.GetServices<IAudioCompletion>();
-        var completer = completions.FirstOrDefault(x => x.Provider == provider);
+        var completions = services.GetServices<IAudioTranscription>();
+        var completer = completions.FirstOrDefault(x => x.Provider == (provider ?? "openai"));
         if (completer == null)
         {
             var logger = services.GetRequiredService<ILogger<CompletionProvider>>();
-            logger.LogError($"Can't resolve audio-completion provider by {provider}");
+            logger.LogError($"Can't resolve audio-transcriber provider by {provider}");
+            return default!;
         }
 
-        completer.SetModelName(model);
+        completer.SetModelName(model ?? "gpt-4o-mini-transcribe");
+        return completer;
+    }
+
+    public static IAudioSynthesis GetAudioSynthesizer(
+        IServiceProvider services,
+        string? provider = null,
+        string? model = null)
+    {
+        var completions = services.GetServices<IAudioSynthesis>();
+        var completer = completions.FirstOrDefault(x => x.Provider == (provider ?? "openai"));
+        if (completer == null)
+        {
+            var logger = services.GetRequiredService<ILogger<CompletionProvider>>();
+            logger.LogError($"Can't resolve audio-synthesizer provider by {provider}");
+            return default!;
+        }
+
+        completer.SetModelName(model ?? "gpt-4o-mini-tts");
         return completer;
     }
 

src/Infrastructure/BotSharp.OpenAPI/Controllers/InstructModeController.cs

@@ -499,8 +499,8 @@ public class InstructModeController : ControllerBase
             file.CopyTo(stream);
             stream.Position = 0;
 
-            var completion = CompletionProvider.GetAudioCompletion(_services, provider: provider ?? "openai", model: model ?? "whisper-1");
-            var content = await completion.GenerateTextFromAudioAsync(stream, file.FileName, text);
+            var completion = CompletionProvider.GetAudioTranscriber(_services, provider: provider, model: model);
+            var content = await completion.TranscriptTextAsync(stream, file.FileName, text);
             viewModel.Content = content;
             stream.Close();
             return viewModel;
@@ -520,8 +520,8 @@ public class InstructModeController : ControllerBase
         var state = _services.GetRequiredService<IConversationStateService>();
         input.States.ForEach(x => state.SetState(x.Key, x.Value, activeRounds: x.ActiveRounds, source: StateSource.External));
 
-        var completion = CompletionProvider.GetAudioCompletion(_services, provider: input.Provider ?? "openai", model: input.Model ?? "tts-1");
-        var binaryData = await completion.GenerateAudioFromTextAsync(input.Text);
+        var completion = CompletionProvider.GetAudioSynthesizer(_services, provider: input.Provider, model: input.Model);
+        var binaryData = await completion.GenerateAudioAsync(input.Text);
         var stream = binaryData.ToStream();
         stream.Position = 0;
 

src/Infrastructure/BotSharp.OpenAPI/Controllers/RealtimeController.cs

@@ -22,7 +22,7 @@ public class RealtimeController : ControllerBase
     [HttpGet("/agent/{agentId}/realtime/session")]
     public async Task<RealtimeSession> CreateSession(string agentId)
     {
-        var completion = CompletionProvider.GetRealTimeCompletion(_services, provider: "openai", modelId: "gpt-4");
+        var completion = CompletionProvider.GetRealTimeCompletion(_services, provider: "openai", modelId: "gpt-4o");
 
         var agentService = _services.GetRequiredService<IAgentService>();
         var agent = await agentService.LoadAgent(agentId);

src/Plugins/BotSharp.Plugin.AudioHandler/AudioHandlerPlugin.cs

@@ -16,7 +16,7 @@ public class AudioHandlerPlugin : IBotSharpPlugin
             return settingService.Bind<AudioHandlerSettings>("AudioHandler");
         });
 
-        services.AddScoped<IAudioCompletion, NativeWhisperProvider>();
+        services.AddScoped<IAudioTranscription, NativeWhisperProvider>();
         services.AddScoped<IAgentUtilityHook, AudioHandlerUtilityHook>();
     }
 }

src/Plugins/BotSharp.Plugin.AudioHandler/Functions/HandleAudioRequestFn.cs

@@ -91,7 +91,7 @@ public class HandleAudioRequestFn : IFunctionCallback
             using var stream = new MemoryStream(bytes);
             stream.Position = 0;
 
-            var result = await audioCompletion.GenerateTextFromAudioAsync(stream, fileName);
+            var result = await audioCompletion.TranscriptTextAsync(stream, fileName);
             transcripts.Add(result);
             stream.Close();
         }
@@ -104,9 +104,9 @@ public class HandleAudioRequestFn : IFunctionCallback
         return string.Join("\r\n\r\n", transcripts);
     }
 
-    private IAudioCompletion PrepareModel()
+    private IAudioTranscription PrepareModel()
     {
-        return CompletionProvider.GetAudioCompletion(_serviceProvider, provider: "openai", model: "whisper-1");
+        return CompletionProvider.GetAudioTranscriber(_serviceProvider);
     }
 
     private bool ParseAudioFileType(string fileName)

src/Plugins/BotSharp.Plugin.AudioHandler/Provider/NativeWhisperProvider.cs

@@ -6,7 +6,7 @@ namespace BotSharp.Plugin.AudioHandler.Provider;
 /// <summary>
 /// Native Whisper provider for speech to text conversion
 /// </summary>
-public class NativeWhisperProvider : IAudioCompletion
+public class NativeWhisperProvider : IAudioTranscription
 {
     private static WhisperProcessor _whisperProcessor;
 
@@ -29,7 +29,7 @@ public class NativeWhisperProvider : IAudioCompletion
         _logger = logger;
     }
 
-    public async Task<string> GenerateTextFromAudioAsync(Stream audio, string audioFileName, string? text = null)
+    public async Task<string> TranscriptTextAsync(Stream audio, string audioFileName, string? text = null)
     {
         var textResult = new List<SegmentData>();
 

src/Plugins/BotSharp.Plugin.AzureOpenAI/AzureOpenAiPlugin.cs

@@ -31,6 +31,6 @@ public class AzureOpenAiPlugin : IBotSharpPlugin
         services.AddScoped<IChatCompletion, ChatCompletionProvider>();
         services.AddScoped<ITextEmbedding, TextEmbeddingProvider>();
         services.AddScoped<IImageCompletion, ImageCompletionProvider>();
-        services.AddScoped<IAudioCompletion, AudioCompletionProvider>();
+        services.AddScoped<IAudioTranscription, AudioCompletionProvider>();
     }
 }

src/Plugins/BotSharp.Plugin.AzureOpenAI/Providers/Audio/AudioCompletionProvider.SpeechToText.cs

@@ -4,7 +4,7 @@ namespace BotSharp.Plugin.AzureOpenAI.Providers.Audio;
 
 public partial class AudioCompletionProvider
 {
-    public async Task<string> GenerateTextFromAudioAsync(Stream audio, string audioFileName, string? text = null)
+    public async Task<string> TranscriptTextAsync(Stream audio, string audioFileName, string? text = null)
     {
         var audioClient = ProviderHelper.GetClient(Provider, _model, _services)
                                         .GetAudioClient(_model);

src/Plugins/BotSharp.Plugin.AzureOpenAI/Providers/Audio/AudioCompletionProvider.cs

@@ -1,6 +1,6 @@
 namespace BotSharp.Plugin.AzureOpenAI.Providers.Audio;
 
-public partial class AudioCompletionProvider : IAudioCompletion
+public partial class AudioCompletionProvider : IAudioTranscription
 {
     private readonly IServiceProvider _services;
 

src/Plugins/BotSharp.Plugin.EmailHandler/Functions/HandleEmailReaderFn.cs

@@ -67,7 +67,7 @@ public class HandleEmailReaderFn : IFunctionCallback
 
                     var llmProviderService = _services.GetRequiredService<ILlmProviderService>();
                     var provider = llmProviderService.GetProviders().FirstOrDefault(x => x == "openai");
-                    var model = llmProviderService.GetProviderModel(provider: provider ?? "openai", id: "gpt-4");
+                    var model = llmProviderService.GetProviderModel(provider: provider ?? "openai", id: "gpt-4o");
                     var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model.Name);
                     var convService = _services.GetRequiredService<IConversationService>();
                     var conversationId = convService.ConversationId;

src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadImageFn.cs

@@ -100,7 +100,7 @@ public class ReadImageFn : IFunctionCallback
         {
             var llmProviderService = _services.GetRequiredService<ILlmProviderService>();
             var provider = llmProviderService.GetProviders().FirstOrDefault(x => x == "openai");
-            var model = llmProviderService.GetProviderModel(provider: provider, id: "gpt-4", multiModal: true);
+            var model = llmProviderService.GetProviderModel(provider: provider, id: "gpt-4o", multiModal: true);
             var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model.Name);
             var response = await completion.GetChatCompletions(agent, dialogs);
             return response.Content;

src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadPdfFn.cs

@@ -78,7 +78,7 @@ public class ReadPdfFn : IFunctionCallback
         {
             var llmProviderService = _services.GetRequiredService<ILlmProviderService>();
             var provider = llmProviderService.GetProviders().FirstOrDefault(x => x == "openai");
-            var model = llmProviderService.GetProviderModel(provider: provider, id: "gpt-4", multiModal: true);
+            var model = llmProviderService.GetProviderModel(provider: provider, id: "gpt-4o", multiModal: true);
             var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model.Name);
             var response = await completion.GetChatCompletions(agent, dialogs);
             return response.Content;

src/Plugins/BotSharp.Plugin.OpenAI/Models/Realtime/RealtimeSessionBody.cs

@@ -61,26 +61,30 @@ public class RealtimeSessionTurnDetection
     /// <summary>
     /// Milliseconds
     /// </summary>
-    [JsonPropertyName("prefix_padding_ms")]
+    /*[JsonPropertyName("prefix_padding_ms")]
     public int PrefixPadding { get; set; } = 300;
 
     [JsonPropertyName("silence_duration_ms")]
     public int SilenceDuration { get; set; } = 500;
 
     [JsonPropertyName("threshold")]
-    public float Threshold { get; set; } = 0.5f;
+    public float Threshold { get; set; } = 0.5f;*/
 
     [JsonPropertyName("type")]
-    public string Type { get; set; } = "server_vad";
+    public string Type { get; set; } = "semantic_vad";
+
+    [JsonPropertyName("eagerness")]
+    public string eagerness { get;set; } = "auto";
 }
 
 public class InputAudioTranscription
 {
     [JsonPropertyName("model")]
-    public string Model { get; set; } = "whisper-1";
+    public string Model { get; set; } = "gpt-4o-transcribe";
 
     [JsonPropertyName("language")]
-    public string Language { get; set; } = "en";
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? Language { get; set; }
 
     [JsonPropertyName("prompt")]
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]

src/Plugins/BotSharp.Plugin.OpenAI/OpenAiPlugin.cs

@@ -33,7 +33,8 @@ public class OpenAiPlugin : IBotSharpPlugin
         services.AddScoped<IChatCompletion, ChatCompletionProvider>();
         services.AddScoped<ITextEmbedding, TextEmbeddingProvider>();
         services.AddScoped<IImageCompletion, ImageCompletionProvider>();
-        services.AddScoped<IAudioCompletion, AudioCompletionProvider>();
+        services.AddScoped<IAudioTranscription, AudioTranscriptionProvider>();
+        services.AddScoped<IAudioSynthesis, AudioSynthesisProvider>();
         services.AddScoped<IRealTimeCompletion, RealTimeCompletionProvider>();
 
         services.AddRefitClient<IOpenAiRealtimeApi>()

src/Plugins/BotSharp.Plugin.OpenAI/Providers/Audio/AudioCompletionProvider.cs

@@ -1,21 +0,0 @@
-namespace BotSharp.Plugin.OpenAI.Providers.Audio;
-
-public partial class AudioCompletionProvider : IAudioCompletion
-{
-    private readonly IServiceProvider _services;
-
-    public string Provider => "openai";
-    public string Model => _model;
-
-    private string _model;
-
-    public AudioCompletionProvider(IServiceProvider service)
-    {
-        _services = service;
-    }
-
-    public void SetModelName(string model)
-    {
-        _model = model;
-    }
-}

src/Plugins/BotSharp.Plugin.OpenAI/Providers/Audio/AudioSynthesisProvider.cs

@@ -2,9 +2,25 @@ using OpenAI.Audio;
 
 namespace BotSharp.Plugin.OpenAI.Providers.Audio;
 
-public partial class AudioCompletionProvider
+public class AudioSynthesisProvider : IAudioSynthesis
 {
-    public async Task<BinaryData> GenerateAudioFromTextAsync(string text, string? voice = "alloy", string? format = "mp3")
+    private readonly IServiceProvider _services;
+    public string Provider => "openai";
+    public string Model => _model;
+
+    private string _model;
+
+    public AudioSynthesisProvider(IServiceProvider service)
+    {
+        _services = service;
+    }
+
+    public void SetModelName(string model)
+    {
+        _model = model;
+    }
+
+    public async Task<BinaryData> GenerateAudioAsync(string text, string? voice = "alloy", string? format = "mp3", string? instructions = null)
     {
         var audioClient = ProviderHelper.GetClient(Provider, _model, _services)
                                         .GetAudioClient(_model);

src/Plugins/BotSharp.Plugin.OpenAI/Providers/Audio/AudioTranscriptionProvider.cs

@@ -2,9 +2,26 @@ using OpenAI.Audio;
 
 namespace BotSharp.Plugin.OpenAI.Providers.Audio;
 
-public partial class AudioCompletionProvider
+public class AudioTranscriptionProvider : IAudioTranscription
 {
-    public async Task<string> GenerateTextFromAudioAsync(Stream audio, string audioFileName, string? text = null)
+    private readonly IServiceProvider _services;
+
+    public string Provider => "openai";
+    public string Model => _model;
+
+    private string _model;
+
+    public AudioTranscriptionProvider(IServiceProvider service)
+    {
+        _services = service;
+    }
+
+    public void SetModelName(string model)
+    {
+        _model = model;
+    }
+
+    public async Task<string> TranscriptTextAsync(Stream audio, string audioFileName, string? text = null)
     {
         var audioClient = ProviderHelper.GetClient(Provider, _model, _services)
                                         .GetAudioClient(_model);

src/Plugins/BotSharp.Plugin.OpenAI/Providers/Realtime/RealTimeCompletionProvider.cs

@@ -351,10 +351,10 @@ public class RealTimeCompletionProvider : IRealTimeCompletion
                 MaxResponseOutputTokens = realtimeModelSettings.MaxResponseOutputTokens,
                 TurnDetection = new RealtimeSessionTurnDetection
                 {
-                    InterruptResponse = interruptResponse,
+                    InterruptResponse = interruptResponse/*,
                     Threshold = realtimeModelSettings.TurnDetection.Threshold,
                     PrefixPadding = realtimeModelSettings.TurnDetection.PrefixPadding,
-                    SilenceDuration = realtimeModelSettings.TurnDetection.SilenceDuration
+                    SilenceDuration = realtimeModelSettings.TurnDetection.SilenceDuration*/
                 },
                 InputAudioNoiseReduction = new InputAudioNoiseReduction
                 {

src/Plugins/BotSharp.Plugin.Twilio/Controllers/TwilioOutboundController.cs

@@ -0,0 +1,65 @@
+using BotSharp.Core.Infrastructures;
+using BotSharp.Plugin.Twilio.Interfaces;
+using BotSharp.Plugin.Twilio.Models;
+using BotSharp.Plugin.Twilio.Services;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace BotSharp.Plugin.Twilio.Controllers;
+
+public class TwilioOutboundController : TwilioController
+{
+    private readonly TwilioSetting _settings;
+    private readonly IServiceProvider _services;
+    private readonly IHttpContextAccessor _context;
+    private readonly ILogger _logger;
+
+    public TwilioOutboundController(TwilioSetting settings, IServiceProvider services, IHttpContextAccessor context, ILogger<TwilioOutboundController> logger)
+    {
+        _settings = settings;
+        _services = services;
+        _context = context;
+        _logger = logger;
+    }
+
+    [ValidateRequest]
+    [HttpPost("twilio/voice/init-outbound-call")]
+    public async Task<TwiMLResult> InitiateOutboundCall(ConversationalVoiceRequest request)
+    {
+        var twilio = _services.GetRequiredService<TwilioService>();
+
+        VoiceResponse response = default!;
+        if (request.AnsweredBy == "machine_start" &&
+            request.Direction == "outbound-api")
+        {
+            response = new VoiceResponse();
+
+            await HookEmitter.Emit<ITwilioCallStatusHook>(_services, async hook =>
+            {
+                await hook.OnVoicemailStarting(request);
+            });
+
+            var url = twilio.GetSpeechPath(request.ConversationId, "voicemail.mp3");
+            response.Play(new Uri(url));
+        }
+        else
+        {
+            var instruction = new ConversationalVoiceResponse
+            {
+                AgentId = request.AgentId,
+                ConversationId = request.ConversationId,
+                ActionOnEmptyResult = true,
+                CallbackPath = $"twilio/voice/receive/1?agent-id={request.AgentId}&conversation-id={request.ConversationId}",
+            };
+
+            if (request.InitAudioFile != null)
+            {
+                instruction.SpeechPaths.Add(request.InitAudioFile);
+            }
+
+            response = twilio.ReturnNoninterruptedInstructions(instruction);
+        }
+
+        return TwiML(response);
+    }
+}

src/Plugins/BotSharp.Plugin.Twilio/Controllers/TwilioVoiceController.cs

@@ -1,5 +1,4 @@
 using BotSharp.Abstraction.Files;
-using BotSharp.Abstraction.Infrastructures;
 using BotSharp.Core.Infrastructures;
 using BotSharp.Plugin.Twilio.Interfaces;
 using BotSharp.Plugin.Twilio.Models;
@@ -69,7 +68,7 @@ public class TwilioVoiceController : TwilioController
         var twilio = _services.GetRequiredService<TwilioService>();
         if (string.IsNullOrWhiteSpace(request.Intent))
         {
-            instruction.CallbackPath = $"twilio/voice/receive/0?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{GenerateStatesParameter(request.States)}";
+            instruction.CallbackPath = $"twilio/voice/receive/0?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{twilio.GenerateStatesParameter(request.States)}";
             response = twilio.ReturnNoninterruptedInstructions(instruction);
         }
         else
@@ -91,7 +90,7 @@ public class TwilioVoiceController : TwilioController
             response = new VoiceResponse();
             // delay 3 seconds to wait for the first message reply and caller is listening dudu sound
             await Task.Delay(1000 * 3);
-            response.Redirect(new Uri($"{_settings.CallbackHost}/twilio/voice/reply/{seqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{GenerateStatesParameter(request.States)}"), HttpMethod.Post);
+            response.Redirect(new Uri($"{_settings.CallbackHost}/twilio/voice/reply/{seqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{twilio.GenerateStatesParameter(request.States)}"), HttpMethod.Post);
         }
 
         await HookEmitter.Emit<ITwilioSessionHook>(_services, async hook =>
@@ -145,14 +144,11 @@ public class TwilioVoiceController : TwilioController
             await messageQueue.EnqueueAsync(callerMessage);
 
             response = new VoiceResponse();
-            response.Redirect(new Uri($"{_settings.CallbackHost}/twilio/voice/reply/{request.SeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{GenerateStatesParameter(request.States)}&AIResponseWaitTime=0"), HttpMethod.Post);
+            response.Redirect(new Uri($"{_settings.CallbackHost}/twilio/voice/reply/{request.SeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{twilio.GenerateStatesParameter(request.States)}&AIResponseWaitTime=0"), HttpMethod.Post);
 
             await HookEmitter.Emit<ITwilioSessionHook>(_services, async hook =>
             {
                 await hook.OnReceivedUserMessage(request);
-            }, new HookEmitOption
-            {
-                OnlyOnce = true
             });
         }
         else
@@ -163,9 +159,6 @@ public class TwilioVoiceController : TwilioController
                 await HookEmitter.Emit<ITwilioSessionHook>(_services, async hook =>
                 {
                     await hook.OnAgentHangUp(request);
-                }, new HookEmitOption
-                {
-                    OnlyOnce = true
                 });
 
                 response = twilio.HangUp(string.Empty);
@@ -178,7 +171,7 @@ public class TwilioVoiceController : TwilioController
                     AgentId = request.AgentId,
                     ConversationId = request.ConversationId,
                     SpeechPaths = new List<string>(),
-                    CallbackPath = $"twilio/voice/receive/{request.SeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{GenerateStatesParameter(request.States)}&attempts={++request.Attempts}",
+                    CallbackPath = $"twilio/voice/receive/{request.SeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{twilio.GenerateStatesParameter(request.States)}&attempts={++request.Attempts}",
                     ActionOnEmptyResult = true
                 };
 
@@ -190,9 +183,6 @@ public class TwilioVoiceController : TwilioController
                 await HookEmitter.Emit<ITwilioSessionHook>(_services, async hook =>
                 {
                     await hook.OnWaitingUserResponse(request, instruction);
-                }, new HookEmitOption
-                {
-                    OnlyOnce = true
                 });
 
                 response = twilio.ReturnInstructions(instruction);
@@ -215,9 +205,10 @@ public class TwilioVoiceController : TwilioController
         var sessionManager = _services.GetRequiredService<ITwilioSessionManager>();
         var twilio = _services.GetRequiredService<TwilioService>();
         var fileStorage = _services.GetRequiredService<IFileStorageService>();
-        if (request.SpeechResult != null)
+        var text = (request.SpeechResult + "\r\n" + request.Digits).Trim();
+        if (!string.IsNullOrEmpty(text))
         {
-            await sessionManager.StageCallerMessageAsync(request.ConversationId, nextSeqNum, request.SpeechResult);
+            await sessionManager.StageCallerMessageAsync(request.ConversationId, nextSeqNum, text);
         }
 
         var reply = await sessionManager.GetAssistantReplyAsync(request.ConversationId, request.SeqNum);
@@ -230,16 +221,13 @@ public class TwilioVoiceController : TwilioController
             {
                 request.AIResponseErrorMessage = $"AI response timeout: AIResponseWaitTime greater than {request.AIResponseWaitTime}, please check internal error log!";
                 await hook.OnAgentHangUp(request);
-            }, new HookEmitOption
-            {
-                OnlyOnce = true
             });
 
             response = twilio.HangUp($"twilio/error.mp3");
         }
         else if (reply == null)
         {
-            response = await WaitingForAiResponse(request);
+            response = await twilio.WaitingForAiResponse(request);
         }
         else
         {
@@ -248,9 +236,6 @@ public class TwilioVoiceController : TwilioController
                 await HookEmitter.Emit<ITwilioSessionHook>(_services, async hook =>
                 {
                     await hook.OnAgentTransferring(request, _settings);
-                }, new HookEmitOption
-                {
-                    OnlyOnce = true
                 });
 
                 response = twilio.DialCsrAgent($"twilio/voice/speeches/{request.ConversationId}/{reply.SpeechFileName}");
@@ -262,9 +247,6 @@ public class TwilioVoiceController : TwilioController
                 await HookEmitter.Emit<ITwilioSessionHook>(_services, async hook =>
                 {
                     await hook.OnAgentHangUp(request);
-                }, new HookEmitOption
-                {
-                    OnlyOnce = true
                 });
             }
             else
@@ -274,7 +256,7 @@ public class TwilioVoiceController : TwilioController
                     AgentId = request.AgentId,
                     ConversationId = request.ConversationId,
                     SpeechPaths = [$"twilio/voice/speeches/{request.ConversationId}/{reply.SpeechFileName}"],
-                    CallbackPath = $"twilio/voice/receive/{nextSeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{GenerateStatesParameter(request.States)}",
+                    CallbackPath = $"twilio/voice/receive/{nextSeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{twilio.GenerateStatesParameter(request.States)}",
                     ActionOnEmptyResult = true,
                     Hints = reply.Hints
                 };
@@ -291,118 +273,6 @@ public class TwilioVoiceController : TwilioController
         return TwiML(response);
     }
 
-    private async Task<VoiceResponse> WaitingForAiResponse(ConversationalVoiceRequest request)
-    {
-        VoiceResponse response;
-        var sessionManager = _services.GetRequiredService<ITwilioSessionManager>();
-        var fileStorage = _services.GetRequiredService<IFileStorageService>();
-        var twilio = _services.GetRequiredService<TwilioService>();
-
-        var indication = await sessionManager.GetReplyIndicationAsync(request.ConversationId, request.SeqNum);
-        if (indication != null)
-        {
-            _logger.LogWarning($"Indication ({request.SeqNum}): {indication}");
-            var speechPaths = new List<string>();
-            foreach (var text in indication.Split('|'))
-            {
-                var seg = text.Trim();
-                if (seg.StartsWith('#'))
-                {
-                    speechPaths.Add($"twilio/{seg.Substring(1)}.mp3");
-                }
-                else
-                {
-                    var hash = Utilities.HashTextMd5(seg);
-                    var fileName = $"indication_{hash}.mp3";
-
-                    var existing = fileStorage.GetSpeechFile(request.ConversationId, fileName);
-                    if (existing == BinaryData.Empty)
-                    {
-                        var completion = CompletionProvider.GetAudioCompletion(_services, "openai", "tts-1");
-                        var data = await completion.GenerateAudioFromTextAsync(seg);
-                        fileStorage.SaveSpeechFile(request.ConversationId, fileName, data);
-                    }
-
-                    speechPaths.Add($"twilio/voice/speeches/{request.ConversationId}/{fileName}");
-                }
-            }
-
-            var instruction = new ConversationalVoiceResponse
-            {
-                AgentId = request.AgentId,
-                ConversationId = request.ConversationId,
-                SpeechPaths = speechPaths,
-                CallbackPath = $"twilio/voice/reply/{request.SeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{GenerateStatesParameter(request.States)}&AIResponseWaitTime={++request.AIResponseWaitTime}",
-                ActionOnEmptyResult = true
-            };
-
-            response = twilio.ReturnInstructions(instruction);
-
-            await sessionManager.RemoveReplyIndicationAsync(request.ConversationId, request.SeqNum);
-        }
-        else
-        {
-            var instruction = new ConversationalVoiceResponse
-            {
-                AgentId = request.AgentId,
-                ConversationId = request.ConversationId,
-                SpeechPaths = [],
-                CallbackPath = $"twilio/voice/reply/{request.SeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{GenerateStatesParameter(request.States)}&AIResponseWaitTime={++request.AIResponseWaitTime}",
-                ActionOnEmptyResult = true
-            };
-
-            await HookEmitter.Emit<ITwilioSessionHook>(_services, async hook =>
-            {
-                await hook.OnWaitingAgentResponse(request, instruction);
-            });
-
-            response = twilio.ReturnInstructions(instruction);
-        }
-
-        return response;
-    }
-
-    [ValidateRequest]
-    [HttpPost("twilio/voice/init-outbound-call")]
-    public async Task<TwiMLResult> InitiateOutboundCall(ConversationalVoiceRequest request)
-    {
-        var twilio = _services.GetRequiredService<TwilioService>();
-
-        VoiceResponse response = default!;
-        if (request.AnsweredBy == "machine_start" &&
-            request.Direction == "outbound-api")
-        {
-            response = new VoiceResponse();
-
-            await HookEmitter.Emit<ITwilioCallStatusHook>(_services, async hook =>
-            {
-                await hook.OnVoicemailStarting(request);
-            });
-
-            var url = twilio.GetSpeechPath(request.ConversationId, "voicemail.mp3");
-            response.Play(new Uri(url));
-        }
-        else
-        {
-            var instruction = new ConversationalVoiceResponse
-            {
-                AgentId = request.AgentId,
-                ConversationId = request.ConversationId,
-                ActionOnEmptyResult = true,
-                CallbackPath = $"twilio/voice/receive/1?agent-id={request.AgentId}&conversation-id={request.ConversationId}",
-            };
-
-            if (request.InitAudioFile != null)
-            {
-                instruction.SpeechPaths.Add(request.InitAudioFile);
-            }
-
-            response = twilio.ReturnNoninterruptedInstructions(instruction);
-        }
-
-        return TwiML(response);
-    }
-
     [ValidateRequest]
     [HttpGet("twilio/voice/speeches/{conversationId}/{fileName}")]
     public async Task<FileContentResult> GetSpeechFile([FromRoute] string conversationId, [FromRoute] string fileName)
@@ -499,13 +369,4 @@ public class TwilioVoiceController : TwilioController
         }
         return result;
     }
-
-    private string GenerateStatesParameter(List<string> states)
-    {
-        if (states is null || states.Count == 0)
-        {
-            return null;
-        }
-        return string.Join("&", states.Select(x => $"states={x}"));
-    }
 }

src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/Functions/HangupPhoneCallFn.cs

@@ -48,8 +48,8 @@ public class HangupPhoneCallFn : IFunctionCallback
         string initAudioFile = null;
         if (!string.IsNullOrEmpty(args.ResponseContent))
         {
-            var completion = CompletionProvider.GetAudioCompletion(_services, "openai", "tts-1");
-            var data = await completion.GenerateAudioFromTextAsync(args.ResponseContent);
+            var completion = CompletionProvider.GetAudioSynthesizer(_services);
+            var data = await completion.GenerateAudioAsync(args.ResponseContent);
             initAudioFile = "ending.mp3";
             fileStorage.SaveSpeechFile(conversationId, initAudioFile, data);
 

src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/Functions/LeaveVoicemailFn.cs

@@ -45,8 +45,8 @@ public class LeaveVoicemailFn : IFunctionCallback
         string initAudioFile = null;
         if (!string.IsNullOrEmpty(args.VoicemailMessage))
         {
-            var completion = CompletionProvider.GetAudioCompletion(_services, "openai", "tts-1");
-            var data = await completion.GenerateAudioFromTextAsync(args.VoicemailMessage);
+            var completion = CompletionProvider.GetAudioSynthesizer(_services);
+            var data = await completion.GenerateAudioAsync(args.VoicemailMessage);
             initAudioFile = "voicemail.mp3";
             fileStorage.SaveSpeechFile(conversationId, initAudioFile, data);
         }

src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/Functions/OutboundPhoneCallFn.cs

@@ -69,8 +69,8 @@ public class OutboundPhoneCallFn : IFunctionCallback
         string initAudioFile = null;
         if (!string.IsNullOrEmpty(args.InitialMessage))
         {
-            var completion = CompletionProvider.GetAudioCompletion(_services, "openai", "tts-1");
-            var data = await completion.GenerateAudioFromTextAsync(args.InitialMessage);
+            var completion = CompletionProvider.GetAudioSynthesizer(_services);
+            var data = await completion.GenerateAudioAsync(args.InitialMessage);
             initAudioFile = "intial.mp3";
             fileStorage.SaveSpeechFile(newConversationId, initAudioFile, data);
 

src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/Functions/TransferPhoneCallFn.cs

@@ -50,8 +50,8 @@ public class TransferPhoneCallFn : IFunctionCallback
         // Generate initial assistant audio
         if (!string.IsNullOrEmpty(args.TransitionMessage))
         {
-            var completion = CompletionProvider.GetAudioCompletion(_services, "openai", "tts-1");
-            var data = await completion.GenerateAudioFromTextAsync(args.TransitionMessage);
+            var completion = CompletionProvider.GetAudioSynthesizer(_services);
+            var data = await completion.GenerateAudioAsync(args.TransitionMessage);
             var initAudioFile = "transfer.mp3";
             fileStorage.SaveSpeechFile(conversationId, initAudioFile, data);
 

src/Plugins/BotSharp.Plugin.Twilio/Services/TwilioMessageQueueService.cs

@@ -137,9 +137,9 @@ public class TwilioMessageQueueService : BackgroundService
 
     private static async Task<string> GetReplySpeechFileName(string conversationId, AssistantMessage reply, IServiceProvider sp)
     {
-        var completion = CompletionProvider.GetAudioCompletion(sp, "openai", "tts-1");
+        var completion = CompletionProvider.GetAudioSynthesizer(sp);
         var fileStorage = sp.GetRequiredService<IFileStorageService>();
-        var data = await completion.GenerateAudioFromTextAsync(reply.Content);
+        var data = await completion.GenerateAudioAsync(reply.Content);
         var fileName = $"reply_{reply.MessageId}.mp3";
         fileStorage.SaveSpeechFile(conversationId, fileName, data);
         return fileName;

src/Plugins/BotSharp.Plugin.Twilio/Services/TwilioService.cs

@@ -1,4 +1,7 @@
+using BotSharp.Abstraction.Files;
 using BotSharp.Abstraction.Utilities;
+using BotSharp.Core.Infrastructures;
+using BotSharp.Plugin.Twilio.Interfaces;
 using BotSharp.Plugin.Twilio.Models;
 using Twilio.Jwt.AccessToken;
 using Token = Twilio.Jwt.AccessToken.Token;
@@ -12,11 +15,13 @@ public class TwilioService
 {
     private readonly TwilioSetting _settings;
     private readonly IServiceProvider _services;
+    public readonly ILogger _logger;
 
-    public TwilioService(TwilioSetting settings, IServiceProvider services)
+    public TwilioService(TwilioSetting settings, IServiceProvider services, ILogger<TwilioService> logger)
     {
         _settings = settings;
         _services = services;
+        _logger = logger;
     }
 
     public string GetAccessToken()
@@ -216,6 +221,76 @@ public class TwilioService
         return response;
     }
 
+    public async Task<VoiceResponse> WaitingForAiResponse(ConversationalVoiceRequest request)
+    {
+        VoiceResponse response;
+        var sessionManager = _services.GetRequiredService<ITwilioSessionManager>();
+        var fileStorage = _services.GetRequiredService<IFileStorageService>();
+
+        var indication = await sessionManager.GetReplyIndicationAsync(request.ConversationId, request.SeqNum);
+        if (indication != null)
+        {
+            _logger.LogWarning($"Indication ({request.SeqNum}): {indication}");
+            var speechPaths = new List<string>();
+            foreach (var text in indication.Split('|'))
+            {
+                var seg = text.Trim();
+                if (seg.StartsWith('#'))
+                {
+                    speechPaths.Add($"twilio/{seg.Substring(1)}.mp3");
+                }
+                else
+                {
+                    var hash = Utilities.HashTextMd5(seg);
+                    var fileName = $"indication_{hash}.mp3";
+
+                    var existing = fileStorage.GetSpeechFile(request.ConversationId, fileName);
+                    if (existing == BinaryData.Empty)
+                    {
+                        var completion = CompletionProvider.GetAudioSynthesizer(_services);
+                        var data = await completion.GenerateAudioAsync(seg);
+                        fileStorage.SaveSpeechFile(request.ConversationId, fileName, data);
+                    }
+
+                    speechPaths.Add($"twilio/voice/speeches/{request.ConversationId}/{fileName}");
+                }
+            }
+
+            var instruction = new ConversationalVoiceResponse
+            {
+                AgentId = request.AgentId,
+                ConversationId = request.ConversationId,
+                SpeechPaths = speechPaths,
+                CallbackPath = $"twilio/voice/reply/{request.SeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{GenerateStatesParameter(request.States)}&AIResponseWaitTime={++request.AIResponseWaitTime}",
+                ActionOnEmptyResult = true
+            };
+
+            response = ReturnInstructions(instruction);
+
+            await sessionManager.RemoveReplyIndicationAsync(request.ConversationId, request.SeqNum);
+        }
+        else
+        {
+            var instruction = new ConversationalVoiceResponse
+            {
+                AgentId = request.AgentId,
+                ConversationId = request.ConversationId,
+                SpeechPaths = [],
+                CallbackPath = $"twilio/voice/reply/{request.SeqNum}?agent-id={request.AgentId}&conversation-id={request.ConversationId}&{GenerateStatesParameter(request.States)}&AIResponseWaitTime={++request.AIResponseWaitTime}",
+                ActionOnEmptyResult = true
+            };
+
+            await HookEmitter.Emit<ITwilioSessionHook>(_services, async hook =>
+            {
+                await hook.OnWaitingAgentResponse(request, instruction);
+            });
+
+            response = ReturnInstructions(instruction);
+        }
+
+        return response;
+    }
+
     public string GetSpeechPath(string conversationId, string speechPath)
     {
         if (speechPath.StartsWith("twilio/"))
@@ -231,4 +306,13 @@ public class TwilioService
             return $"{_settings.CallbackHost}/twilio/voice/speeches/{conversationId}/{speechPath}";
         }
     }
+
+    public string GenerateStatesParameter(List<string> states)
+    {
+        if (states is null || states.Count == 0)
+        {
+            return null;
+        }
+        return string.Join("&", states.Select(x => $"states={x}"));
+    }
 }