diff --git a/Protocol/fgcom.xml b/Protocol/fgcom.xml
index fea23d11e..c31876584 100644
--- a/Protocol/fgcom.xml
+++ b/Protocol/fgcom.xml
@@ -154,6 +154,13 @@
     <node>/sim/sound/atc/volume</node>
    </chunk>
 
+   <chunk>
+    <name>silence-threshold</name>
+    <type>double</type>
+    <format>SILENCE_THD=%1.1f</format>
+    <node>/sim/fgcom/silence-threshold</node>
+   </chunk>
+
   </output>
 
  </generic>
diff --git a/gui/dialogs/fgcom.xml b/gui/dialogs/fgcom.xml
index d7959550d..b0e13734a 100644
--- a/gui/dialogs/fgcom.xml
+++ b/gui/dialogs/fgcom.xml
@@ -237,6 +237,36 @@
       <live>true</live>
       <property>/sim/fgcom/speaker-level</property>
     </text>
+
+    <text>
+      <row>5</row>
+      <col>0</col>
+      <label>Silence threshold:</label>
+      <halign>right</halign>
+    </text>
+    <slider>
+      <row>5</row>
+      <col>1</col>
+      <halign>left</halign>
+      <name>silence-thd</name>
+      <label></label>
+      <min>-60.0</min>
+      <max>0.0</max>
+      <step>1</step>
+      <property>/sim/fgcom/silence-threshold</property>
+      <binding>
+        <command>dialog-apply</command>
+        <object-name>silence-thd</object-name>
+      </binding>
+    </slider>
+    <text>
+      <row>5</row>
+      <col>2</col>
+      <label>1234</label>
+      <format>%.1f</format>
+      <live>true</live>
+      <property>/sim/fgcom/silence-threshold</property>
+    </text>
   </group>
 
   <hrule/>