diff --git a/src/com/android/settings/network/ims/VolteQueryImsState.java b/src/com/android/settings/network/ims/VolteQueryImsState.java
index 558b1358efc..b999cda95ff 100644
--- a/src/com/android/settings/network/ims/VolteQueryImsState.java
+++ b/src/com/android/settings/network/ims/VolteQueryImsState.java
@@ -26,7 +26,7 @@ import com.android.settings.network.SubscriptionUtil;
 /**
  * Controller class for querying Volte status
  */
-public class VolteQueryImsState {
+public class VolteQueryImsState extends ImsQueryController {
 
     private Context mContext;
     private int mSubId;
@@ -42,6 +42,20 @@ public class VolteQueryImsState {
         mSubId = subId;
     }
 
+    /**
+     * Get allowance status for user to alter configuration
+     *
+     * @return true when changing configuration by user is allowed.
+     */
+    public boolean isAllowUserControl() {
+        if (!SubscriptionManager.isValidSubscriptionId(mSubId)) {
+            return false;
+        }
+
+        return ((!isSystemTtyEnabled(mContext).directQuery())
+                || (isTtyOnVolteEnabled(mSubId).directQuery()));
+    }
+
     /**
      * Get user's configuration
      *
diff --git a/src/com/android/settings/network/telephony/Enhanced4gBasePreferenceController.java b/src/com/android/settings/network/telephony/Enhanced4gBasePreferenceController.java
index f6b7d706559..123e100ff77 100644
--- a/src/com/android/settings/network/telephony/Enhanced4gBasePreferenceController.java
+++ b/src/com/android/settings/network/telephony/Enhanced4gBasePreferenceController.java
@@ -108,6 +108,7 @@ public class Enhanced4gBasePreferenceController extends TelephonyTogglePreferenc
             return CONDITIONALLY_UNAVAILABLE;
         }
         final PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(subId);
+        final VolteQueryImsState queryState = queryImsState(subId);
         final boolean isVisible = SubscriptionManager.isValidSubscriptionId(subId)
                 && mImsManager != null && carrierConfig != null
                 && mImsManager.isVolteEnabledByPlatform()
@@ -115,7 +116,8 @@ public class Enhanced4gBasePreferenceController extends TelephonyTogglePreferenc
                 && MobileNetworkUtils.isImsServiceStateReady(mImsManager)
                 && !carrierConfig.getBoolean(CarrierConfigManager.KEY_HIDE_ENHANCED_4G_LTE_BOOL);
         return isVisible
-                ? (isPrefEnabled() ? AVAILABLE : AVAILABLE_UNSEARCHABLE)
+                ? (isUserControlAllowed() && queryState.isAllowUserControl()
+                ? AVAILABLE : AVAILABLE_UNSEARCHABLE)
                 : CONDITIONALLY_UNAVAILABLE;
     }
 
@@ -141,9 +143,10 @@ public class Enhanced4gBasePreferenceController extends TelephonyTogglePreferenc
         final SwitchPreference switchPreference = (SwitchPreference) preference;
 
         final VolteQueryImsState queryState = queryImsState(mSubId);
-        switchPreference.setEnabled(isPrefEnabled());
+        switchPreference.setEnabled(isUserControlAllowed()
+                && queryState.isAllowUserControl());
         switchPreference.setChecked(queryState.isEnabledByUser()
-                && mImsManager.isNonTtyOrTtyOnVolteEnabled());
+                && queryState.isAllowUserControl());
     }
 
     @Override
@@ -191,13 +194,6 @@ public class Enhanced4gBasePreferenceController extends TelephonyTogglePreferenc
         return new VolteQueryImsState(mContext, subId);
     }
 
-    private boolean isPrefEnabled() {
-        return SubscriptionManager.isValidSubscriptionId(mSubId)
-                && isUserControlAllowed()
-                && mImsManager != null
-                && mImsManager.isNonTtyOrTtyOnVolteEnabled();
-    }
-
     private boolean isUserControlAllowed() {
         return (mCallState != null) && (mCallState == TelephonyManager.CALL_STATE_IDLE)
                 && mCarrierConfig.getBoolean(
diff --git a/src/com/android/settings/network/telephony/Enhanced4gLteSliceHelper.java b/src/com/android/settings/network/telephony/Enhanced4gLteSliceHelper.java
index 48a732cd0e4..3cad3161bb3 100644
--- a/src/com/android/settings/network/telephony/Enhanced4gLteSliceHelper.java
+++ b/src/com/android/settings/network/telephony/Enhanced4gLteSliceHelper.java
@@ -48,7 +48,6 @@ import com.android.settings.network.ims.VolteQueryImsState;
 import com.android.settings.slices.CustomSliceRegistry;
 import com.android.settings.slices.SliceBroadcastReceiver;
 
-
 /**
  * Helper class to control slices for enhanced 4g LTE settings.
  */
@@ -70,11 +69,6 @@ public class Enhanced4gLteSliceHelper {
     public static final String ACTION_MOBILE_NETWORK_SETTINGS_ACTIVITY =
             "android.settings.NETWORK_OPERATOR_SETTINGS";
 
-    /**
-     * Timeout for querying enhanced 4g lte setting from ims manager.
-     */
-    private static final int TIMEOUT_MILLIS = 2000;
-
     private final Context mContext;
 
     /**
@@ -193,7 +187,7 @@ public class Enhanced4gLteSliceHelper {
             if (imsManager.isVolteEnabledByPlatform() && isVolteProvisionedOnDevice(subId)) {
                 final VolteQueryImsState queryState = queryImsState(subId);
                 final boolean currentValue = queryState.isEnabledByUser()
-                        && imsManager.isNonTtyOrTtyOnVolteEnabled();
+                        && queryState.isAllowUserControl();
                 final boolean newValue = intent.getBooleanExtra(EXTRA_TOGGLE_STATE,
                         currentValue);
                 if (newValue != currentValue) {