diff --git a/src/com/android/services/telephony/DisconnectCauseUtil.java b/src/com/android/services/telephony/DisconnectCauseUtil.java
index 1a8aa07..f243462 100644
--- a/src/com/android/services/telephony/DisconnectCauseUtil.java
+++ b/src/com/android/services/telephony/DisconnectCauseUtil.java
@@ -348,6 +348,9 @@
             case android.telephony.DisconnectCause.DATA_LIMIT_REACHED:
                 resourceId = R.string.callFailed_data_limit_reached;
                 break;
+            case android.telephony.DisconnectCause.WIFI_LOST:
+                resourceId = R.string.callFailed_wifi_lost;
+                break;
             case android.telephony.DisconnectCause.ALREADY_DIALING:
                 resourceId = R.string.callFailed_already_dialing;
                 break;
@@ -867,6 +870,7 @@
             case android.telephony.DisconnectCause.NORMAL:
             case android.telephony.DisconnectCause.NORMAL_UNSPECIFIED:
             case android.telephony.DisconnectCause.VIDEO_CALL_NOT_ALLOWED_WHILE_TTY_ENABLED:
+            case android.telephony.DisconnectCause.WIFI_LOST:
             default:
                 return ToneGenerator.TONE_PROP_PROMPT;
         }
diff --git a/tests/src/com/android/services/telephony/DisconnectCauseUtilTest.java b/tests/src/com/android/services/telephony/DisconnectCauseUtilTest.java
new file mode 100644
index 0000000..7f9efdc
--- /dev/null
+++ b/tests/src/com/android/services/telephony/DisconnectCauseUtilTest.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.services.telephony;
+
+import static android.media.ToneGenerator.TONE_PROP_PROMPT;
+
+import static junit.framework.Assert.assertNotNull;
+import static junit.framework.TestCase.assertEquals;
+
+import android.telephony.DisconnectCause;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class DisconnectCauseUtilTest {
+    /**
+     * Verifies that a call drop due to loss of WIFI results in a disconnect cause of error and that
+     * the label, description and tone are all present.
+     */
+    @Test
+    public void testDropDueToWifiLoss() {
+        android.telecom.DisconnectCause tcCause = DisconnectCauseUtil.toTelecomDisconnectCause(
+                DisconnectCause.WIFI_LOST);
+        assertEquals(android.telecom.DisconnectCause.ERROR, tcCause.getCode());
+        assertEquals(TONE_PROP_PROMPT, tcCause.getTone());
+        assertNotNull(tcCause.getDescription());
+        assertNotNull(tcCause.getReason());
+    }
+}