enable answering machine detection

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

@@ -126,9 +126,11 @@ public class TwilioVoiceController : TwilioController
                 SeqNumber = request.SeqNum,
                 Content = messageContent,
                 Digits = request.Digits,
-                From = request.From,
+                From = string.Equals(request.Direction, "inbound") ? request.From : request.To,
                 States = ParseStates(request.States)
             };
+            callerMessage.RequestHeaders = new KeyValuePair<string, Microsoft.Extensions.Primitives.StringValues>[Request.Headers.Count];
+            Request.Headers.CopyTo(callerMessage.RequestHeaders, 0);
             await messageQueue.EnqueueAsync(callerMessage);
 
             response = new VoiceResponse();
@@ -387,6 +389,7 @@ public class TwilioVoiceController : TwilioController
                 $"twilio/voice/speeches/{conversationId}/intial.mp3"
             }
         };
+        string tag = Request.Form["AnsweredBy"];
         var twilio = _services.GetRequiredService<TwilioService>();
         var response = twilio.ReturnNoninterruptedInstructions(instruction);
         return TwiML(response);

src/Plugins/BotSharp.Plugin.Twilio/Models/CallerMessage.cs

@@ -1,3 +1,5 @@
+using Microsoft.Extensions.Primitives;
+
 namespace BotSharp.Plugin.Twilio.Models
 {
     public class CallerMessage
@@ -8,6 +10,7 @@ namespace BotSharp.Plugin.Twilio.Models
         public string Digits { get; set; }
         public string From { get; set; }
         public Dictionary<string, string> States { get; set; } = new();
+        public KeyValuePair<string, StringValues>[] RequestHeaders { get; set; }
 
         public override string ToString()
         {

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

@@ -92,7 +92,8 @@ namespace BotSharp.Plugin.Twilio.OutboundPhoneCallHandler.Functions
             var call = await CallResource.CreateAsync(
                 url: new Uri($"{_twilioSetting.CallbackHost}/twilio/voice/init-call?conversationId={conversationId}"),
                 to: new PhoneNumber(args.PhoneNumber),
-                from: new PhoneNumber(_twilioSetting.PhoneNumber));
+                from: new PhoneNumber(_twilioSetting.PhoneNumber),
+                machineDetection: "DetectMessageEnd");
 
             message.Content = $"The generated phone message: {args.InitialMessage}. \r\n[Conversation ID: {conversationId}]" ?? message.Content;
             message.StopCompletion = true;

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

@@ -65,6 +65,10 @@ namespace BotSharp.Plugin.Twilio.Services
             var httpContext = sp.GetRequiredService<IHttpContextAccessor>();
             httpContext.HttpContext = new DefaultHttpContext();
             httpContext.HttpContext.User = new ClaimsPrincipal(new ClaimsIdentity());
+            foreach (var header in message.RequestHeaders)
+            {
+                httpContext.HttpContext.Request.Headers[header.Key] = header.Value;
+            }
             httpContext.HttpContext.Request.Headers["X-Twilio-BotSharp"] = "LOST";
 
             AssistantMessage reply = null;