diff --git a/src/services/speechprocessorproxy.cpp b/src/services/speechprocessorproxy.cpp
index beaeb519673c3eef0dc55e5b816ccf0313790c71..2b614274b0a607945fb8fd40422006fd5d4a7976 100644
--- a/src/services/speechprocessorproxy.cpp
+++ b/src/services/speechprocessorproxy.cpp
@@ -73,7 +73,7 @@ void onRecognitionAudioResult(GDBusConnection *connection,
                               gpointer user_data) {
     auto *proxy = static_cast<SpeechProcessorProxy *>(user_data);
     if (proxy->inputAudioDataCallback_ == nullptr) {
-        std::cout << "RecognitionAudioResult callback is nullptr";
+        std::cout << "RecognitionAudioResult callback is nullptr" << std::endl;
         return;
     }
     proxy->inputAudioDataCallback_(recognitionResult(parameters));
@@ -88,7 +88,7 @@ void onStopRecognitionAudioResult(GDBusConnection *connection,
                                   gpointer user_data) {
     auto *proxy = static_cast<SpeechProcessorProxy *>(user_data);
     if (proxy->stopRecognizingAudioCallback_ == nullptr) {
-        std::cout << "StopRecognitionAudioResult callback is nullptr";
+        std::cout << "StopRecognitionAudioResult callback is nullptr" << std::endl;
         return;
     }
     proxy->stopRecognizingAudioCallback_(recognitionResult(parameters));
@@ -103,7 +103,7 @@ void onRecognitionAudioOnceResult(GDBusConnection *connection,
                                   gpointer user_data) {
     auto *proxy = static_cast<SpeechProcessorProxy *>(user_data);
     if (proxy->recognizingCompleteAudioCallback_ == nullptr) {
-        std::cout << "RecognitionAudioOnceResult callback is nullptr";
+        std::cout << "RecognitionAudioOnceResult callback is nullptr" << std::endl;
         return;
     }
     proxy->recognizingCompleteAudioCallback_(recognitionResult(parameters));
@@ -118,12 +118,27 @@ void onSynthesisAudioResult(GDBusConnection *connection,
                             gpointer user_data) {
     auto *proxy = static_cast<SpeechProcessorProxy *>(user_data);
     if (proxy->inputContinuousTextCallback_ == nullptr) {
-        std::cout << "SynthesisAudioResult callback is nullptr";
+        std::cout << "SynthesisAudioResult callback is nullptr" << std::endl;
         return;
     }
     proxy->inputContinuousTextCallback_(synthesisResult(parameters));
 }
 
+void onStopSynthesizingAudio(GDBusConnection *connection,
+                             const gchar *sender_name,
+                             const gchar *object_path,
+                             const gchar *interface_name,
+                             const gchar *signal_name,
+                             GVariant *parameters,
+                             gpointer user_data) {
+    auto *proxy = static_cast<SpeechProcessorProxy *>(user_data);
+    if (proxy->stopSynthesizingAudioCallback_ == nullptr) {
+        std::cout << "stopSynthesizingAudio callback is nullptr" << std::endl;
+        return;
+    }
+    proxy->stopSynthesizingAudioCallback_();
+}
+
 void onSynthesisAudioOnceResult(GDBusConnection *connection,
                                 const gchar *sender_name,
                                 const gchar *object_path,
@@ -133,7 +148,7 @@ void onSynthesisAudioOnceResult(GDBusConnection *connection,
                                 gpointer user_data) {
     auto *proxy = static_cast<SpeechProcessorProxy *>(user_data);
     if (proxy->recognizingCompleteTextCallback_ == nullptr) {
-        std::cout << "SynthesisAudioOnceResult callback is nullptr";
+        std::cout << "SynthesisAudioOnceResult callback is nullptr" << std::endl;
         return;
     }
     proxy->recognizingCompleteTextCallback_(synthesisResult(parameters));
@@ -271,6 +286,10 @@ void SpeechProcessorProxy::connectSignals() {
         interfaceName_, "SynthesisAudioResult", objectPath_, NULL,
         G_DBUS_SIGNAL_FLAGS_NONE, onSynthesisAudioResult, this, nullptr);
 
+    g_dbus_connection_signal_subscribe(connection, nullptr,
+        interfaceName_, "StopSynthesizingAudio", objectPath_, NULL,
+        G_DBUS_SIGNAL_FLAGS_NONE, onStopSynthesizingAudio, this, nullptr);
+
     g_dbus_connection_signal_subscribe(connection, nullptr,
         interfaceName_, "SynthesisAudioOnceResult", objectPath_, NULL,
         G_DBUS_SIGNAL_FLAGS_NONE, onSynthesisAudioOnceResult, this, nullptr);
@@ -407,7 +426,6 @@ void SpeechProcessorProxy::onStopSynthesizingAudioCallback(AisdkSpeechProcessor
         printErrorMessage(error, "input_continuous_text");
         return;
     }
-    proxy->stopSynthesizingAudioCallback_();
 }
 
 void SpeechProcessorProxy::onRecognizingCompleteTextCallback(AisdkSpeechProcessor *delegate,
diff --git a/src/services/speechprocessorproxy.h b/src/services/speechprocessorproxy.h
index c91b8d46f83960825240459ee17856795a107e27..49c2e440c621b045838725c8b470d7f234a38086 100644
--- a/src/services/speechprocessorproxy.h
+++ b/src/services/speechprocessorproxy.h
@@ -112,6 +112,13 @@ private:
                                        const gchar *signal_name,
                                        GVariant *parameters,
                                        gpointer user_data);
+    friend void onStopSynthesizingAudio(GDBusConnection *connection,
+                                        const gchar *sender_name,
+                                        const gchar *object_path,
+                                        const gchar *interface_name,
+                                        const gchar *signal_name,
+                                        GVariant *parameters,
+                                        gpointer user_data);
     friend void onSynthesisAudioOnceResult(GDBusConnection *connection,
                                            const gchar *sender_name,
                                            const gchar *object_path,