diff --git a/Android.bp b/Android.bp
index 501b438..5a3561e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -28,6 +28,7 @@
     static_libs: [
         "androidx.annotation_annotation",
         "androidx.core_core",
+        "telecom_flags-lib",
     ],
     libs: [
         "services",
@@ -50,6 +51,7 @@
     name: "TelecomUnitTests",
     static_libs: [
         "android-ex-camera2",
+        "flag-junit",
         "guava",
         "mockito-target-extended",
         "androidx.test.rules",
@@ -60,6 +62,7 @@
         "androidx.fragment_fragment",
         "androidx.test.ext.junit",
         "platform-compat-test-rules",
+        "telecom_flags-lib",
     ],
     srcs: [
         "tests/src/**/*.java",
diff --git a/flags/Android.bp b/flags/Android.bp
new file mode 100644
index 0000000..34bcd81
--- /dev/null
+++ b/flags/Android.bp
@@ -0,0 +1,32 @@
+//
+// Copyright (C) 2023 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 {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+aconfig_declarations {
+    name: "telecom_flags",
+    package: "com.android.server.telecom.flags",
+    srcs: [
+      "telecom_ringer_flag_declarations.aconfig",
+    ],
+}
+
+java_aconfig_library {
+    name: "telecom_flags-lib",
+    aconfig_declarations: "telecom_flags"
+}
\ No newline at end of file
diff --git a/flags/telecom_ringer_flag_declarations.aconfig b/flags/telecom_ringer_flag_declarations.aconfig
new file mode 100644
index 0000000..bc0dcc8
--- /dev/null
+++ b/flags/telecom_ringer_flag_declarations.aconfig
@@ -0,0 +1,8 @@
+package: "com.android.server.telecom.flags"
+
+flag {
+  name: "use_device_provided_serialized_ringer_vibration"
+  namespace: "android_platform_telecom"
+  description: "Gates whether to use a serialized, device-specific ring vibration."
+  bug: "282113261"
+}
\ No newline at end of file
diff --git a/res/values/config.xml b/res/values/config.xml
index 15f765b..c38a6ec 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -49,8 +49,10 @@
     <bool name="grant_location_permission_enabled">false</bool>
 
     <!-- When true, a simple full intensity on/off vibration pattern will be used when calls ring.
-         When false, a fancy vibration pattern which ramps up and down will be used.
-         Devices should overlay this value based on the type of vibration hardware they employ. -->
+
+         When false, the vibration effect serialized in the raw `default_ringtone_vibration_effect`
+         resource (under `frameworks/base/core/res/res/raw/`) is used. Devices should overlay this
+         value based on the type of vibration hardware they employ. -->
     <bool name="use_simple_vibration_pattern">false</bool>
 
     <!-- Threshold for the X+Y component of gravity needed for the device orientation to be
diff --git a/src/com/android/server/telecom/CallsManager.java b/src/com/android/server/telecom/CallsManager.java
index abf3478..bc0fe49 100644
--- a/src/com/android/server/telecom/CallsManager.java
+++ b/src/com/android/server/telecom/CallsManager.java
@@ -132,6 +132,7 @@
 import com.android.server.telecom.callredirection.CallRedirectionProcessor;
 import com.android.server.telecom.components.ErrorDialogActivity;
 import com.android.server.telecom.components.TelecomBroadcastReceiver;
+import com.android.server.telecom.flags.FeatureFlags;
 import com.android.server.telecom.stats.CallFailureCause;
 import com.android.server.telecom.ui.AudioProcessingNotification;
 import com.android.server.telecom.ui.CallRedirectionTimeoutDialogActivity;
@@ -577,7 +578,8 @@
             TransactionManager transactionManager,
             EmergencyCallDiagnosticLogger emergencyCallDiagnosticLogger,
             CallAudioCommunicationDeviceTracker communicationDeviceTracker,
-            CallStreamingNotification callStreamingNotification) {
+            CallStreamingNotification callStreamingNotification,
+            FeatureFlags featureFlags) {
 
         mContext = context;
         mLock = lock;
@@ -643,7 +645,7 @@
                 ringtoneFactory, systemVibrator,
                 new Ringer.VibrationEffectProxy(), mInCallController,
                 mContext.getSystemService(NotificationManager.class),
-                accessibilityManagerAdapter);
+                accessibilityManagerAdapter, featureFlags);
         mCallRecordingTonePlayer = new CallRecordingTonePlayer(mContext, audioManager,
                 mTimeoutsAdapter, mLock);
         mCallAudioManager = new CallAudioManager(callAudioRouteStateMachine,
diff --git a/src/com/android/server/telecom/Ringer.java b/src/com/android/server/telecom/Ringer.java
index 16dc5c4..1cf2399 100644
--- a/src/com/android/server/telecom/Ringer.java
+++ b/src/com/android/server/telecom/Ringer.java
@@ -22,10 +22,12 @@
 import static android.provider.Settings.Global.ZEN_MODE_OFF;
 
 import android.annotation.NonNull;
+import android.annotation.Nullable;
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.Person;
 import android.content.Context;
+import android.content.res.Resources;
 import android.media.AudioManager;
 import android.media.Ringtone;
 import android.media.VolumeShaper;
@@ -38,13 +40,20 @@
 import android.os.VibrationAttributes;
 import android.os.VibrationEffect;
 import android.os.Vibrator;
+import android.os.vibrator.persistence.VibrationXmlParser;
 import android.telecom.Log;
 import android.telecom.TelecomManager;
+import android.text.TextUtils;
 import android.view.accessibility.AccessibilityManager;
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.server.telecom.LogUtils.EventTimer;
+import com.android.server.telecom.flags.FeatureFlags;
 
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CountDownLatch;
@@ -59,6 +68,8 @@
  */
 @VisibleForTesting
 public class Ringer {
+    private static final String TAG = "TelecomRinger";
+
     public interface AccessibilityManagerAdapter {
         boolean startFlashNotificationSequence(@NonNull Context context,
                 @AccessibilityManager.FlashNotificationReason int reason);
@@ -84,6 +95,16 @@
     // Used for test to notify the completion of RingerAttributes
     private CountDownLatch mAttributesLatch;
 
+    /**
+     * Delay to be used between consecutive vibrations when a non-repeating vibration effect is
+     * provided by the device.
+     *
+     * <p>If looking to customize the loop delay for a device's ring vibration, the desired repeat
+     * behavior should be encoded directly in the effect specification in the device configuration
+     * rather than changing the here (i.e. in `R.raw.default_ringtone_vibration_effect` resource).
+     */
+    private static int DEFAULT_RING_VIBRATION_LOOP_DELAY_MS = 1000;
+
     private static final long[] PULSE_PRIMING_PATTERN = {0,12,250,12,500}; // priming  + interval
 
     private static final int[] PULSE_PRIMING_AMPLITUDE = {0,255,0,255,0};  // priming  + interval
@@ -96,9 +117,11 @@
     private static final int[] PULSE_RAMPING_AMPLITUDE = {
         77,77,78,79,81,84,87,93,101,114,133,162,205,255,255,0};
 
-    private static final long[] PULSE_PATTERN;
+    @VisibleForTesting
+    public static final long[] PULSE_PATTERN;
 
-    private static final int[] PULSE_AMPLITUDE;
+    @VisibleForTesting
+    public static final int[] PULSE_AMPLITUDE;
 
     private static final int RAMPING_RINGER_VIBRATION_DURATION = 5000;
     private static final int RAMPING_RINGER_DURATION = 10000;
@@ -207,7 +230,8 @@
             VibrationEffectProxy vibrationEffectProxy,
             InCallController inCallController,
             NotificationManager notificationManager,
-            AccessibilityManagerAdapter accessibilityManagerAdapter) {
+            AccessibilityManagerAdapter accessibilityManagerAdapter,
+            FeatureFlags featureFlags) {
 
         mLock = new Object();
         mSystemSettingsUtil = systemSettingsUtil;
@@ -223,13 +247,9 @@
         mNotificationManager = notificationManager;
         mAccessibilityManagerAdapter = accessibilityManagerAdapter;
 
-        if (mContext.getResources().getBoolean(R.bool.use_simple_vibration_pattern)) {
-            mDefaultVibrationEffect = mVibrationEffectProxy.createWaveform(SIMPLE_VIBRATION_PATTERN,
-                    SIMPLE_VIBRATION_AMPLITUDE, REPEAT_SIMPLE_VIBRATION_AT);
-        } else {
-            mDefaultVibrationEffect = mVibrationEffectProxy.createWaveform(PULSE_PATTERN,
-                    PULSE_AMPLITUDE, REPEAT_VIBRATION_AT);
-        }
+        mDefaultVibrationEffect =
+                loadDefaultRingVibrationEffect(
+                        mContext, mVibrator, mVibrationEffectProxy, featureFlags);
 
         mIsHapticPlaybackSupportedByDevice =
                 mSystemSettingsUtil.isHapticPlaybackSupported(mContext);
@@ -757,4 +777,59 @@
             return false;
         }
     }
+
+    @Nullable
+    private static VibrationEffect loadSerializedDefaultRingVibration(Resources resources) {
+
+        try {
+            InputStream vibrationInputStream =
+                    resources.openRawResource(
+                            com.android.internal.R.raw.default_ringtone_vibration_effect);
+            return VibrationXmlParser.parse(
+                    new InputStreamReader(vibrationInputStream, StandardCharsets.UTF_8));
+        } catch (IOException | Resources.NotFoundException e) {
+            Log.e(TAG, e, "Error parsing default ring vibration effect.");
+            return null;
+        }
+    }
+
+    private static VibrationEffect loadDefaultRingVibrationEffect(
+            Context context,
+            Vibrator vibrator,
+            VibrationEffectProxy vibrationEffectProxy,
+            FeatureFlags featureFlags) {
+        Resources resources = context.getResources();
+
+        if (resources.getBoolean(R.bool.use_simple_vibration_pattern)) {
+            Log.i(TAG, "Using simple default ring vibration.");
+            return createSimpleRingVibration(vibrationEffectProxy);
+        }
+
+        if (featureFlags.useDeviceProvidedSerializedRingerVibration()) {
+            VibrationEffect parsedEffect = loadSerializedDefaultRingVibration(resources);
+            if (parsedEffect != null && vibrator.areVibrationFeaturesSupported(parsedEffect)) {
+                Log.i(TAG, "Using parsed default ring vibration.");
+                // Make the parsed effect repeating to make it vibrate continuously during ring.
+                // If the effect is already repeating, this API call is a no-op.
+                // Otherwise, it  uses `DEFAULT_RING_VIBRATION_LOOP_DELAY_MS` when changing a
+                // non-repeating vibration to a repeating vibration.
+                // This is so that we ensure consecutive loops of the vibration play with some gap
+                // in between.
+                return parsedEffect.applyRepeatingIndefinitely(
+                        /* wantRepeating= */ true, DEFAULT_RING_VIBRATION_LOOP_DELAY_MS);
+            }
+            // Fallback to the simple vibration if the serialized effect cannot be loaded.
+            return createSimpleRingVibration(vibrationEffectProxy);
+        }
+
+        Log.i(TAG, "Using pulse default ring vibration.");
+        return vibrationEffectProxy.createWaveform(
+                PULSE_PATTERN, PULSE_AMPLITUDE, REPEAT_VIBRATION_AT);
+    }
+
+    private static VibrationEffect createSimpleRingVibration(
+            VibrationEffectProxy vibrationEffectProxy) {
+        return vibrationEffectProxy.createWaveform(SIMPLE_VIBRATION_PATTERN,
+                SIMPLE_VIBRATION_AMPLITUDE, REPEAT_SIMPLE_VIBRATION_AT);
+    }
 }
diff --git a/src/com/android/server/telecom/TelecomSystem.java b/src/com/android/server/telecom/TelecomSystem.java
index 3686e86..76224ba 100644
--- a/src/com/android/server/telecom/TelecomSystem.java
+++ b/src/com/android/server/telecom/TelecomSystem.java
@@ -47,6 +47,7 @@
 import com.android.server.telecom.callfiltering.BlockedNumbersAdapter;
 import com.android.server.telecom.components.UserCallIntentProcessor;
 import com.android.server.telecom.components.UserCallIntentProcessorFactory;
+import com.android.server.telecom.flags.FeatureFlags;
 import com.android.server.telecom.ui.AudioProcessingNotification;
 import com.android.server.telecom.ui.CallStreamingNotification;
 import com.android.server.telecom.ui.DisconnectedCallNotifier;
@@ -224,7 +225,8 @@
             Ringer.AccessibilityManagerAdapter accessibilityManagerAdapter,
             Executor asyncTaskExecutor,
             Executor asyncCallAudioTaskExecutor,
-            BlockedNumbersAdapter blockedNumbersAdapter) {
+            BlockedNumbersAdapter blockedNumbersAdapter,
+            FeatureFlags featureFlags) {
         mContext = context.getApplicationContext();
         LogUtils.initLogging(mContext);
         android.telecom.Log.setLock(mLock);
@@ -406,7 +408,8 @@
                     transactionManager,
                     emergencyCallDiagnosticLogger,
                     communicationDeviceTracker,
-                    callStreamingNotification);
+                    callStreamingNotification,
+                    featureFlags);
 
             mIncomingCallNotifier = incomingCallNotifier;
             incomingCallNotifier.setCallsManagerProxy(new IncomingCallNotifier.CallsManagerProxy() {
diff --git a/src/com/android/server/telecom/components/TelecomService.java b/src/com/android/server/telecom/components/TelecomService.java
index 90a683f..9a5f2a7 100644
--- a/src/com/android/server/telecom/components/TelecomService.java
+++ b/src/com/android/server/telecom/components/TelecomService.java
@@ -61,6 +61,7 @@
 import com.android.server.telecom.TelecomWakeLock;
 import com.android.server.telecom.Timeouts;
 import com.android.server.telecom.callfiltering.BlockedNumbersAdapter;
+import com.android.server.telecom.flags.FeatureFlagsImpl;
 import com.android.server.telecom.settings.BlockedNumbersUtil;
 import com.android.server.telecom.ui.IncomingCallNotifier;
 import com.android.server.telecom.ui.MissedCallNotifierImpl;
@@ -230,7 +231,8 @@
                                     BlockedNumbersUtil.updateEmergencyCallNotification(context,
                                             showNotification);
                                 }
-                            }));
+                            },
+                            new FeatureFlagsImpl()));
         }
     }
 
diff --git a/tests/src/com/android/server/telecom/tests/CallsManagerTest.java b/tests/src/com/android/server/telecom/tests/CallsManagerTest.java
index 00be89f..873f9ed 100644
--- a/tests/src/com/android/server/telecom/tests/CallsManagerTest.java
+++ b/tests/src/com/android/server/telecom/tests/CallsManagerTest.java
@@ -124,6 +124,7 @@
 import com.android.server.telecom.bluetooth.BluetoothStateReceiver;
 import com.android.server.telecom.callfiltering.BlockedNumbersAdapter;
 import com.android.server.telecom.callfiltering.CallFilteringResult;
+import com.android.server.telecom.flags.FeatureFlags;
 import com.android.server.telecom.ui.AudioProcessingNotification;
 import com.android.server.telecom.ui.CallStreamingNotification;
 import com.android.server.telecom.ui.DisconnectedCallNotifier;
@@ -279,6 +280,7 @@
     @Mock private PhoneCapability mPhoneCapability;
     @Mock private CallAudioCommunicationDeviceTracker mCommunicationDeviceTracker;
     @Mock private CallStreamingNotification mCallStreamingNotification;
+    @Mock private FeatureFlags mFeatureFlags;
 
     private CallsManager mCallsManager;
 
@@ -353,7 +355,8 @@
                 TransactionManager.getTestInstance(),
                 mEmergencyCallDiagnosticLogger,
                 mCommunicationDeviceTracker,
-                mCallStreamingNotification);
+                mCallStreamingNotification,
+                mFeatureFlags);
 
         when(mPhoneAccountRegistrar.getPhoneAccount(
                 eq(SELF_MANAGED_HANDLE), any())).thenReturn(SELF_MANAGED_ACCOUNT);
diff --git a/tests/src/com/android/server/telecom/tests/ComponentContextFixture.java b/tests/src/com/android/server/telecom/tests/ComponentContextFixture.java
index df855e9..d076120 100644
--- a/tests/src/com/android/server/telecom/tests/ComponentContextFixture.java
+++ b/tests/src/com/android/server/telecom/tests/ComponentContextFixture.java
@@ -81,8 +81,10 @@
 import android.util.DisplayMetrics;
 import android.view.accessibility.AccessibilityManager;
 
+import java.io.ByteArrayInputStream;
 import java.io.File;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -802,6 +804,11 @@
         when(mResources.getStringArray(eq(id))).thenReturn(value);
     }
 
+    public void putRawResource(int id, String content) {
+        when(mResources.openRawResource(id))
+                .thenReturn(new ByteArrayInputStream(content.getBytes(StandardCharsets.UTF_8)));
+    }
+
     public void setTelecomManager(TelecomManager telecomManager) {
         mTelecomManager = telecomManager;
     }
diff --git a/tests/src/com/android/server/telecom/tests/RingerTest.java b/tests/src/com/android/server/telecom/tests/RingerTest.java
index 34360ca..4a4a893 100644
--- a/tests/src/com/android/server/telecom/tests/RingerTest.java
+++ b/tests/src/com/android/server/telecom/tests/RingerTest.java
@@ -17,8 +17,11 @@
 package com.android.server.telecom.tests;
 
 import static android.provider.Settings.Global.ZEN_MODE_IMPORTANT_INTERRUPTIONS;
+import static android.os.VibrationEffect.EFFECT_CLICK;
 
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyBoolean;
@@ -30,6 +33,7 @@
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.timeout;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
@@ -40,6 +44,7 @@
 import android.app.NotificationManager;
 import android.content.ComponentName;
 import android.content.Context;
+import android.content.res.Resources;
 import android.media.AudioAttributes;
 import android.media.AudioManager;
 import android.media.Ringtone;
@@ -50,11 +55,16 @@
 import android.os.UserManager;
 import android.os.VibrationAttributes;
 import android.os.VibrationEffect;
+import android.os.vibrator.persistence.VibrationXmlParser;
 import android.os.Vibrator;
+import android.platform.test.flag.junit.CheckFlagsRule;
+import android.platform.test.flag.junit.DeviceFlagsValueProvider;
 import android.telecom.PhoneAccountHandle;
 import android.telecom.TelecomManager;
 import android.test.suitebuilder.annotation.SmallTest;
 
+import androidx.test.InstrumentationRegistry;
+
 import com.android.server.telecom.AsyncRingtonePlayer;
 import com.android.server.telecom.Call;
 import com.android.server.telecom.CallState;
@@ -63,9 +73,11 @@
 import com.android.server.telecom.Ringer;
 import com.android.server.telecom.RingtoneFactory;
 import com.android.server.telecom.SystemSettingsUtil;
+import com.android.server.telecom.flags.FeatureFlags;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -73,15 +85,25 @@
 import org.mockito.Spy;
 
 import java.util.concurrent.CompletableFuture;
+import java.time.Duration;
 
 @RunWith(JUnit4.class)
 public class RingerTest extends TelecomTestCase {
+    @Rule
+    public final CheckFlagsRule mCheckFlagsRule = DeviceFlagsValueProvider.createCheckFlagsRule();
+
     private static final Uri FAKE_RINGTONE_URI = Uri.parse("content://media/fake/audio/1729");
     // Returned when the a URI-based VibrationEffect is attempted, to avoid depending on actual
     // device configuration for ringtone URIs. The actual Uri can be verified via the
     // VibrationEffectProxy mock invocation.
     private static final VibrationEffect URI_VIBRATION_EFFECT =
             VibrationEffect.createPredefined(VibrationEffect.EFFECT_CLICK);
+    private static final VibrationEffect EXPECTED_SIMPLE_VIBRATION_PATTERN =
+            VibrationEffect.createWaveform(
+                    new long[] {0, 1000, 1000}, new int[] {0, 255, 0}, 1);
+    private static final VibrationEffect EXPECTED_PULSE_VIBRATION_PATTERN =
+            VibrationEffect.createWaveform(
+                    Ringer.PULSE_PATTERN, Ringer.PULSE_AMPLITUDE, 5);
 
     @Mock InCallTonePlayer.Factory mockPlayerFactory;
     @Mock SystemSettingsUtil mockSystemSettingsUtil;
@@ -90,6 +112,7 @@
     @Mock InCallController mockInCallController;
     @Mock NotificationManager mockNotificationManager;
     @Mock Ringer.AccessibilityManagerAdapter mockAccessibilityManagerAdapter;
+    @Mock private FeatureFlags mFeatureFlags;
 
     @Spy Ringer.VibrationEffectProxy spyVibrationEffectProxy;
 
@@ -111,7 +134,7 @@
     @Before
     public void setUp() throws Exception {
         super.setUp();
-        mContext = mComponentContextFixture.getTestDouble().getApplicationContext();
+        mContext = spy(mComponentContextFixture.getTestDouble().getApplicationContext());
         doReturn(URI_VIBRATION_EFFECT).when(spyVibrationEffectProxy).get(any(), any());
         when(mockPlayerFactory.createPlayer(anyInt())).thenReturn(mockTonePlayer);
         mockAudioManager = mContext.getSystemService(AudioManager.class);
@@ -140,7 +163,8 @@
     private void createRingerUnderTest() {
         mRingerUnderTest = new Ringer(mockPlayerFactory, mContext, mockSystemSettingsUtil,
                 asyncRingtonePlayer, mockRingtoneFactory, mockVibrator, spyVibrationEffectProxy,
-                mockInCallController, mockNotificationManager, mockAccessibilityManagerAdapter);
+                mockInCallController, mockNotificationManager, mockAccessibilityManagerAdapter,
+                mFeatureFlags);
         // This future is used to wait for AsyncRingtonePlayer to finish its part.
         mRingerUnderTest.setBlockOnRingingFuture(mRingCompletionFuture);
     }
@@ -153,6 +177,151 @@
 
     @SmallTest
     @Test
+    public void testSimpleVibrationPrecedesValidSupportedDefaultRingVibrationOverride()
+            throws Exception {
+        when(mFeatureFlags.useDeviceProvidedSerializedRingerVibration()).thenReturn(true);
+        mockVibrationResourceValues(
+                """
+                    <vibration>
+                        <predefined-effect name="click"/>
+                    </vibration>
+                """,
+                /* useSimpleVibration= */ true);
+        when(mockVibrator.areVibrationFeaturesSupported(any())).thenReturn(true);
+
+        createRingerUnderTest();
+
+        assertEquals(EXPECTED_SIMPLE_VIBRATION_PATTERN, mRingerUnderTest.mDefaultVibrationEffect);
+    }
+
+    @SmallTest
+    @Test
+    public void testDefaultRingVibrationOverrideNotUsedWhenFeatureIsDisabled()
+            throws Exception {
+        when(mFeatureFlags.useDeviceProvidedSerializedRingerVibration()).thenReturn(false);
+        mockVibrationResourceValues(
+                """
+                    <vibration>
+                        <waveform-effect>
+                            <waveform-entry durationMs="100" amplitude="0"/>
+                            <repeating>
+                                <waveform-entry durationMs="500" amplitude="default"/>
+                                <waveform-entry durationMs="700" amplitude="0"/>
+                            </repeating>
+                        </waveform-effect>
+                    </vibration>
+                """,
+                /* useSimpleVibration= */ false);
+        when(mockVibrator.areVibrationFeaturesSupported(any())).thenReturn(true);
+
+        createRingerUnderTest();
+
+        assertEquals(EXPECTED_PULSE_VIBRATION_PATTERN, mRingerUnderTest.mDefaultVibrationEffect);
+    }
+
+    @SmallTest
+    @Test
+    public void testValidSupportedRepeatingDefaultRingVibrationOverride() throws Exception {
+        when(mFeatureFlags.useDeviceProvidedSerializedRingerVibration()).thenReturn(true);
+        mockVibrationResourceValues(
+                """
+                    <vibration>
+                        <waveform-effect>
+                            <waveform-entry durationMs="100" amplitude="0"/>
+                            <repeating>
+                                <waveform-entry durationMs="500" amplitude="default"/>
+                                <waveform-entry durationMs="700" amplitude="0"/>
+                            </repeating>
+                        </waveform-effect>
+                    </vibration>
+                """,
+                /* useSimpleVibration= */ false);
+        when(mockVibrator.areVibrationFeaturesSupported(any())).thenReturn(true);
+
+        createRingerUnderTest();
+
+        assertEquals(
+                VibrationEffect.createWaveform(new long[]{100, 500, 700}, /* repeat= */ 1),
+                mRingerUnderTest.mDefaultVibrationEffect);
+    }
+
+    @SmallTest
+    @Test
+    public void testValidSupportedNonRepeatingDefaultRingVibrationOverride() throws Exception {
+        when(mFeatureFlags.useDeviceProvidedSerializedRingerVibration()).thenReturn(true);
+        mockVibrationResourceValues(
+                """
+                    <vibration>
+                        <predefined-effect name="click"/>
+                    </vibration>
+                """,
+                /* useSimpleVibration= */ false);
+        when(mockVibrator.areVibrationFeaturesSupported(any())).thenReturn(true);
+
+        createRingerUnderTest();
+
+        assertEquals(
+                VibrationEffect
+                        .startComposition()
+                        .repeatEffectIndefinitely(
+                                VibrationEffect
+                                        .startComposition()
+                                        .addEffect(VibrationEffect.createPredefined(EFFECT_CLICK))
+                                        .addOffDuration(Duration.ofSeconds(1))
+                                        .compose()
+                        )
+                        .compose(),
+                mRingerUnderTest.mDefaultVibrationEffect);
+    }
+
+    @SmallTest
+    @Test
+    public void testValidButUnsupportedDefaultRingVibrationOverride() throws Exception {
+        when(mFeatureFlags.useDeviceProvidedSerializedRingerVibration()).thenReturn(true);
+        mockVibrationResourceValues(
+                """
+                    <vibration>
+                        <predefined-effect name="click"/>
+                    </vibration>
+                """,
+                /* useSimpleVibration= */ false);
+        when(mockVibrator.areVibrationFeaturesSupported(
+                eq(VibrationEffect.createPredefined(EFFECT_CLICK)))).thenReturn(false);
+
+        createRingerUnderTest();
+
+        assertEquals(EXPECTED_SIMPLE_VIBRATION_PATTERN, mRingerUnderTest.mDefaultVibrationEffect);
+    }
+
+    @SmallTest
+    @Test
+    public void testInvalidDefaultRingVibrationOverride() throws Exception {
+        when(mFeatureFlags.useDeviceProvidedSerializedRingerVibration()).thenReturn(true);
+        mockVibrationResourceValues(
+                /* defaultVibrationContent= */ "bad serialization",
+                /* useSimpleVibration= */ false);
+        when(mockVibrator.areVibrationFeaturesSupported(any())).thenReturn(true);
+
+        createRingerUnderTest();
+
+        assertEquals(EXPECTED_SIMPLE_VIBRATION_PATTERN, mRingerUnderTest.mDefaultVibrationEffect);
+    }
+
+    @SmallTest
+    @Test
+    public void testEmptyDefaultRingVibrationOverride() throws Exception {
+        when(mFeatureFlags.useDeviceProvidedSerializedRingerVibration()).thenReturn(true);
+        mockVibrationResourceValues(
+                /* defaultVibrationContent= */ "", /* useSimpleVibration= */ false);
+        when(mockVibrator.areVibrationFeaturesSupported(any())).thenReturn(true);
+
+        createRingerUnderTest();
+
+        assertEquals(EXPECTED_SIMPLE_VIBRATION_PATTERN, mRingerUnderTest.mDefaultVibrationEffect);
+    }
+
+    @SmallTest
+    @Test
     public void testNoActionInTheaterMode() throws Exception {
         // Start call waiting to make sure that it doesn't stop when we start ringing
         mRingerUnderTest.startCallWaiting(mockCall1);
@@ -670,4 +839,13 @@
         when(mockRingtoneFactory.getHapticOnlyRingtone()).thenReturn(mockRingtone);
         return mockRingtone;
     }
+
+    private void mockVibrationResourceValues(
+            String defaultVibrationContent, boolean useSimpleVibration) {
+        mComponentContextFixture.putRawResource(
+                com.android.internal.R.raw.default_ringtone_vibration_effect,
+                defaultVibrationContent);
+        mComponentContextFixture.putBooleanResource(
+                R.bool.use_simple_vibration_pattern, useSimpleVibration);
+    }
 }
diff --git a/tests/src/com/android/server/telecom/tests/TelecomSystemTest.java b/tests/src/com/android/server/telecom/tests/TelecomSystemTest.java
index ed96d74..868ca25 100644
--- a/tests/src/com/android/server/telecom/tests/TelecomSystemTest.java
+++ b/tests/src/com/android/server/telecom/tests/TelecomSystemTest.java
@@ -99,6 +99,7 @@
 import com.android.server.telecom.bluetooth.BluetoothRouteManager;
 import com.android.server.telecom.callfiltering.BlockedNumbersAdapter;
 import com.android.server.telecom.components.UserCallIntentProcessor;
+import com.android.server.telecom.flags.FeatureFlags;
 import com.android.server.telecom.ui.IncomingCallNotifier;
 
 import com.google.common.base.Predicate;
@@ -217,6 +218,8 @@
     BlockedNumbersAdapter mBlockedNumbersAdapter;
     @Mock
     CallAudioCommunicationDeviceTracker mCommunicationDeviceTracker;
+    @Mock
+    FeatureFlags mFeatureFlags;
 
     final ComponentName mInCallServiceComponentNameX =
             new ComponentName(
@@ -555,7 +558,8 @@
                 }, mDeviceIdleControllerAdapter, mAccessibilityManagerAdapter,
                 Runnable::run,
                 Runnable::run,
-                mBlockedNumbersAdapter);
+                mBlockedNumbersAdapter,
+                mFeatureFlags);
 
         mComponentContextFixture.setTelecomManager(new TelecomManager(
                 mComponentContextFixture.getTestDouble(),