diff --git a/src/websocket/bot-conversation.ts b/src/websocket/bot-conversation.ts
index cae52f2..8959e07 100644
--- a/src/websocket/bot-conversation.ts
+++ b/src/websocket/bot-conversation.ts
@@ -141,7 +141,7 @@ export class BotConversationWebSocket extends EventEmitter2 implements BotConver
       case VaicToBotMessageName.userStreamStart:
         this.userAudio = new PassThrough();
         this.emit('userStream', this.userAudio, { message: msgJson });
-        await this.send(BotToVaicMessageName.userStreamStarted);
+        await this.send(BotToVaicMessageName.userStreamStarted, { participant: msgJson.participant });
         break;
       case VaicToBotMessageName.userStreamChunk:
         this.userAudio?.write(Buffer.from(msgJson.audioChunk!, 'base64'));
@@ -149,7 +149,7 @@ export class BotConversationWebSocket extends EventEmitter2 implements BotConver
       case VaicToBotMessageName.userStreamStop:
         this.#log('user stream stopped');
         this.userAudio?.end();
-        await this.send(BotToVaicMessageName.userStreamStopped);
+        await this.send(BotToVaicMessageName.userStreamStopped, { participant: msgJson.participant });
         delete this.userAudio;
         break;
       case VaicToBotMessageName.activities:
@@ -191,16 +191,18 @@ export class BotConversationWebSocket extends EventEmitter2 implements BotConver
     }
   }
 
-  sendHypothesis(text: string) {
+  sendHypothesis(text: string, participant?: string) {
     return this.send(BotToVaicMessageName.userStreamSpeechHypothesis, {
+      participant,
       alternatives: [{
         text: text.toLowerCase()
       }]
     });
   }
 
-  sendRecognition(text: string, confidence: number) {
+  sendRecognition(text: string, confidence: number, participant?: string) {
     return this.send(BotToVaicMessageName.userStreamSpeechRecognition, {
+      participant,
       alternatives: [{
         text: text.toLowerCase(),
         confidence
@@ -208,6 +210,10 @@ export class BotConversationWebSocket extends EventEmitter2 implements BotConver
     });
   }
 
+  sendCommitted(participant?: string) {
+    return this.send(BotToVaicMessageName.userStreamSpeechCommitted, { participant });
+  }
+
   async playTextMessage(text: string, params?: Record<string, unknown>) {
     return this.sendActivity({
       type: BotActivityType.message,
diff --git a/src/websocket/types.ts b/src/websocket/types.ts
index f890601..58a17be 100644
--- a/src/websocket/types.ts
+++ b/src/websocket/types.ts
@@ -98,6 +98,7 @@ export interface ProtocolMessage extends PlayAudioOptions {
   expectAudioMessages?: boolean;
   supportedMediaFormats?: string[];
   caller?: string;
+  participant?: string
   activities?: BotActivity[];
   audioChunk?: string;
   [key: string]: unknown;