diff --git a/lib/session/call-session.js b/lib/session/call-session.js
index ee7b9f66..58e7d2f9 100644
--- a/lib/session/call-session.js
+++ b/lib/session/call-session.js
@@ -658,6 +658,15 @@ class CallSession extends Emitter {
     }
   }
 
+  // disableTtsCache
+  get disableTtsCache() {
+    return this._disableTtsCache || false;
+  }
+
+  set disableTtsCache(d) {
+    this._disableTtsCache = d;
+  }
+
   getTsStreamingVendor() {
     let v;
     if (this.currentTask?.isStreamingTts) {
diff --git a/lib/tasks/config.js b/lib/tasks/config.js
index 64b2822a..8eac4e9b 100644
--- a/lib/tasks/config.js
+++ b/lib/tasks/config.js
@@ -18,7 +18,8 @@ class TaskConfig extends Task {
       'boostAudioSignal',
       'vad',
       'ttsStream',
-      'autoStreamTts'
+      'autoStreamTts',
+      'disableTtsCache'
     ].forEach((k) => this[k] = this.data[k] || {});
 
     if ('notifyEvents' in this.data) {
@@ -88,6 +89,7 @@ class TaskConfig extends Task {
   get hasReferHook() { return Object.keys(this.data).includes('referHook'); }
   get hasNotifySttLatency() { return Object.keys(this.data).includes('notifySttLatency'); }
   get hasTtsStream() { return Object.keys(this.ttsStream).length; }
+  get hasDisableTtsCache() { return Object.keys(this.data).includes('disableTtsCache'); }
 
   get summary() {
     const phrase = [];
@@ -125,6 +127,7 @@ class TaskConfig extends Task {
       phrase.push(`${this.ttsStream.enable ? 'enable' : 'disable'} ttsStream`);
     }
     if ('autoStreamTts' in this.data) phrase.push(`enable Say.stream value ${this.data.autoStreamTts ? 'on' : 'off'}`);
+    if (this.hasDisableTtsCache) phrase.push(`disableTtsCache ${this.data.disableTtsCache ? 'on' : 'off'}`);
     return `${this.name}{${phrase.join(',')}}`;
   }
 
@@ -357,6 +360,11 @@ class TaskConfig extends Task {
       this.logger.info('Config: disabling ttsStream');
       cs.disableTtsStream();
     }
+
+    if (this.hasDisableTtsCache) {
+      this.logger.info(`set disableTtsCache = ${this.disableTtsCache}`);
+      cs.disableTtsCache = this.data.disableTtsCache;
+    }
   }
 
   async kill(cs) {
diff --git a/lib/tasks/tts-task.js b/lib/tasks/tts-task.js
index 41598f85..416bde49 100644
--- a/lib/tasks/tts-task.js
+++ b/lib/tasks/tts-task.js
@@ -41,6 +41,10 @@ class TtsTask extends Task {
 
   async exec(cs) {
     super.exec(cs);
+    // update disableTtsCache from call session if not set in task
+    if (this.data.disableTtsCache == null) {
+      this.disableTtsCache = cs.disableTtsCache;
+    }
     if (cs.synthesizer) {
       this.options = {...cs.synthesizer.options, ...this.options};
       this.data.synthesizer = this.data.synthesizer || {};