diff --git a/src/com/android/phone/settings/AccessibilitySettingsFragment.java b/src/com/android/phone/settings/AccessibilitySettingsFragment.java
index d5a613b..ea19f75 100644
--- a/src/com/android/phone/settings/AccessibilitySettingsFragment.java
+++ b/src/com/android/phone/settings/AccessibilitySettingsFragment.java
@@ -31,10 +31,14 @@
 import android.util.Log;
 
 import com.android.ims.ImsManager;
+import com.android.internal.telephony.Phone;
+import com.android.internal.telephony.PhoneFactory;
 import com.android.phone.PhoneGlobals;
 import com.android.phone.R;
 import com.android.phone.settings.TtyModeListPreference;
 
+import java.util.List;
+
 public class AccessibilitySettingsFragment extends PreferenceFragment {
     private static final String LOG_TAG = AccessibilitySettingsFragment.class.getSimpleName();
     private static final boolean DBG = (PhoneGlobals.DBG_LEVEL >= 2);
@@ -54,7 +58,10 @@
             if (DBG) Log.d(LOG_TAG, "PhoneStateListener.onCallStateChanged: state=" + state);
             Preference pref = getPreferenceScreen().findPreference(BUTTON_TTY_KEY);
             if (pref != null) {
-                pref.setEnabled(state == TelephonyManager.CALL_STATE_IDLE);
+                final boolean isVolteTtySupported = ImsManager.isVolteEnabledByPlatform(mContext)
+                        && getVolteTtySupported();
+                pref.setEnabled((isVolteTtySupported && !isVideoCallInProgress()) ||
+                        (state == TelephonyManager.CALL_STATE_IDLE));
             }
         }
     };
@@ -98,23 +105,17 @@
     @Override
     public void onResume() {
         super.onResume();
-
-        if (ImsManager.isVolteEnabledByPlatform(mContext) && !getVolteTtySupported()) {
-            TelephonyManager tm =
-                    (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
-            tm.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
-        }
+        TelephonyManager tm =
+                (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
+        tm.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
     }
 
     @Override
     public void onPause() {
         super.onPause();
-
-        if (ImsManager.isVolteEnabledByPlatform(mContext) && !getVolteTtySupported()) {
-            TelephonyManager tm =
-                    (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
-            tm.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);
-        }
+        TelephonyManager tm =
+                (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
+        tm.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);
     }
 
     @Override
@@ -142,4 +143,19 @@
         return configManager.getConfig().getBoolean(
                 CarrierConfigManager.KEY_CARRIER_VOLTE_TTY_SUPPORTED_BOOL);
     }
+
+    private boolean isVideoCallInProgress() {
+        final Phone[] phones = PhoneFactory.getPhones();
+        if (phones == null) {
+            if (DBG) Log.d(LOG_TAG, "isVideoCallInProgress: No phones found. Return false");
+            return false;
+        }
+
+        for (Phone phone : phones) {
+            if (phone.isVideoCallPresent()) {
+                return true;
+            }
+        }
+        return false;
+    }
 }