diff --git a/testapps/callaudiotest/Android.bp b/testapps/callaudiotest/Android.bp
new file mode 100644
index 0000000..81164e6
--- /dev/null
+++ b/testapps/callaudiotest/Android.bp
@@ -0,0 +1,31 @@
+//
+// Copyright (C) 2021 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"],
+}
+
+android_test {
+    name: "TelecomCallAudioTestApp",
+    static_libs: [
+        "androidx.legacy_legacy-support-v4",
+        "guava",
+    ],
+    srcs: ["src/**/*.java"],
+    platform_apis: true,
+    certificate: "platform",
+    privileged: true,
+}
diff --git a/testapps/callaudiotest/AndroidManifest.xml b/testapps/callaudiotest/AndroidManifest.xml
new file mode 100644
index 0000000..014ab29
--- /dev/null
+++ b/testapps/callaudiotest/AndroidManifest.xml
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 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.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+     coreApp="true"
+     package="com.android.server.telecom.callaudiotest">
+
+    <uses-sdk android:minSdkVersion="28"
+         android:targetSdkVersion="29"/>
+    <uses-permission android:name="android.permission.BLUETOOTH"/>
+    <uses-permission android:name="android.permission.CALL_PHONE"/>
+    <uses-permission android:name="android.permission.CONTROL_INCALL_EXPERIENCE"/>
+    <uses-permission android:name="android.permission.READ_CALL_LOG"/>
+    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_ROUTING"/>
+    <uses-permission android:name="android.permission.MODIFY_PHONE_STATE"/>
+    <uses-permission android:name="android.permission.WRITE_CALL_LOG"/>
+
+    <application android:label="Telecom Call Audio Test">
+        <uses-library android:name="android.test.runner"/>
+
+        <service android:name="com.android.server.telecom.callaudiotest.CallAudioTestInCallService"
+             android:permission="android.permission.BIND_INCALL_SERVICE"
+             android:exported="true">
+            <meta-data android:name="android.telecom.IN_CALL_SERVICE_CAR_MODE_UI"
+                       android:value="false"/>
+            <meta-data android:name="android.telecom.INCLUDE_SELF_MANAGED_CALLS"
+                       android:value="false"/>
+          <intent-filter>
+              <action android:name="android.telecom.InCallService"/>
+          </intent-filter>
+        </service>
+
+        <activity android:name="com.android.server.telecom.callaudiotest.CallAudioTestActivity"
+             android:label="Call Audio Test"
+             android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
diff --git a/testapps/callaudiotest/res/layout/call_audio_test_activity.xml b/testapps/callaudiotest/res/layout/call_audio_test_activity.xml
new file mode 100644
index 0000000..0d847f0
--- /dev/null
+++ b/testapps/callaudiotest/res/layout/call_audio_test_activity.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 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.
+-->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+    <TextView
+        android:id="@+id/appLabel"
+        android:layout_gravity="left"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textSize="25dp"
+        android:text="Call Audio Testing" />
+    <TextView
+        android:id="@+id/appDescription"
+        android:layout_gravity="left"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textSize="12dp"
+        android:text="You can enabled auto answer and calls will be answered and some awesome audio will be looped to the caller." />
+    <CheckBox
+        android:id="@+id/enableAutoAnswer"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Answer calls and loop audio" />
+</LinearLayout>
diff --git a/testapps/callaudiotest/res/raw/speech.m4a b/testapps/callaudiotest/res/raw/speech.m4a
new file mode 100644
index 0000000..4161ad6
--- /dev/null
+++ b/testapps/callaudiotest/res/raw/speech.m4a
Binary files differ
diff --git a/testapps/callaudiotest/src/com/android/server/telecom/callaudiotest/CallAudioTestActivity.java b/testapps/callaudiotest/src/com/android/server/telecom/callaudiotest/CallAudioTestActivity.java
new file mode 100644
index 0000000..b75a498
--- /dev/null
+++ b/testapps/callaudiotest/src/com/android/server/telecom/callaudiotest/CallAudioTestActivity.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2021 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.server.telecom.callaudiotest;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.net.Uri;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.EditText;
+
+/**
+ * Activity to configure the auto answer behavior.
+ */
+public class CallAudioTestActivity extends Activity {
+    private static final int RESULT_PICK_FILE = 1;
+    public static final String AUDIO_TEST_PREFS = "audio_test_prefs";
+    public static final String AUTO_ANSWER_ENABLED = "auto_answer_enabled";
+    private CheckBox mEnable;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        setContentView(R.layout.call_audio_test_activity);
+        mEnable = findViewById(R.id.enableAutoAnswer);
+        mEnable.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                SharedPreferences prefs = getSharedPreferences(AUDIO_TEST_PREFS, MODE_PRIVATE);
+                SharedPreferences.Editor edit = prefs.edit();
+                edit.putBoolean(AUTO_ANSWER_ENABLED, isChecked);
+                edit.apply();
+            }
+        });
+        loadPreferences();
+    }
+
+    private void loadPreferences() {
+        SharedPreferences prefs = getSharedPreferences(AUDIO_TEST_PREFS, MODE_PRIVATE);
+        mEnable.setChecked(prefs.getBoolean(AUTO_ANSWER_ENABLED, false));
+    }
+}
diff --git a/testapps/callaudiotest/src/com/android/server/telecom/callaudiotest/CallAudioTestInCallService.java b/testapps/callaudiotest/src/com/android/server/telecom/callaudiotest/CallAudioTestInCallService.java
new file mode 100644
index 0000000..bd98a7f
--- /dev/null
+++ b/testapps/callaudiotest/src/com/android/server/telecom/callaudiotest/CallAudioTestInCallService.java
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2021 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.server.telecom.callaudiotest;
+
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.media.AudioAttributes;
+import android.media.AudioDeviceInfo;
+import android.media.AudioManager;
+import android.media.MediaPlayer;
+import android.net.Uri;
+import android.os.IBinder;
+import android.telecom.Call;
+import android.telecom.InCallService;
+import android.telecom.Log;
+import android.telecom.VideoProfile;
+
+import java.io.IOException;
+import java.lang.String;
+
+/**
+ * Simple test InCallService which answers a call automatically and plays back some looping audio.
+ * Intended for testing call audio between devices.
+ */
+public class CallAudioTestInCallService extends InCallService {
+    private Call mIncomingCall;
+    private boolean mIsAutoAnswerEnabled = false;
+    private MediaPlayer mMediaPlayer;
+    private Call.Callback mCallback = new Call.Callback() {
+        @Override
+        public void onStateChanged(Call call, int state) {
+            if (state == Call.STATE_ACTIVE) {
+                startPlaying();
+            }
+        }
+    };
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        SharedPreferences prefs = getSharedPreferences(CallAudioTestActivity.AUDIO_TEST_PREFS,
+                MODE_PRIVATE);
+        mIsAutoAnswerEnabled = prefs.getBoolean(CallAudioTestActivity.AUTO_ANSWER_ENABLED, false);
+        return super.onBind(intent);
+    }
+
+    @Override
+    public void onCallAdded(Call call) {
+        if (!mIsAutoAnswerEnabled) {
+            Log.i(this, "onCallAdded - autoanswer disabled, skip");
+            return;
+        }
+        if (call.getDetails().getState() == Call.STATE_RINGING) {
+            mIncomingCall = call;
+            mIncomingCall.registerCallback(mCallback);
+            mIncomingCall.answer(VideoProfile.STATE_AUDIO_ONLY);
+
+            Log.i(this, "onCallAdded - ringing call");
+        } else {
+            Log.i(this, "onCallAdded - nonringing call");
+        }
+    }
+
+    @Override
+    public void onCallRemoved(Call call) {
+        if (mIncomingCall == call) {
+            mIncomingCall = null;
+            if (mMediaPlayer != null) {
+                mMediaPlayer.stop();
+                mMediaPlayer.release();
+            }
+        }
+    }
+
+    private void startPlaying() {
+        AudioDeviceInfo telephonyDevice = getTelephonyDevice(getSystemService(AudioManager.class));
+        if (telephonyDevice != null) {
+            Log.i(this, "startPlaying: create player for speech");
+            mMediaPlayer = new MediaPlayer();
+            mMediaPlayer.setOnCompletionListener(mediaPlayer -> Log.w(this, "startPlaying: done"));
+            mMediaPlayer.setOnErrorListener(
+                (mediaPlayer, what, extra) -> {
+                        Log.w(this, "startPlaying: playback failed!");
+                        return true; // Error handled
+                        });
+            mMediaPlayer.setLooping(true);
+            mMediaPlayer.setVolume(1.0f);
+            AudioAttributes audioAttributes = new AudioAttributes.Builder()
+                    .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION).build();
+            mMediaPlayer.setAudioAttributes(audioAttributes);
+            try {
+                mMediaPlayer.setDataSource(getResources().openRawResourceFd(R.raw.speech));
+                mMediaPlayer.prepare();
+            } catch (IOException e) {
+                mMediaPlayer.release();
+                throw new IllegalStateException(e);
+            }
+            if (!mMediaPlayer.setPreferredDevice(telephonyDevice)) {
+                Log.w(this, "startPlaying: setPreferredDevice failed");
+            }
+            mMediaPlayer.start();
+
+        }
+    }
+
+    private AudioDeviceInfo getTelephonyDevice(AudioManager audioManager) {
+        AudioDeviceInfo[] deviceList = audioManager.getDevices(AudioManager.GET_DEVICES_OUTPUTS);
+        for (AudioDeviceInfo device: deviceList) {
+            if (device.getType() == AudioDeviceInfo.TYPE_TELEPHONY) {
+                return device;
+            }
+        }
+        return null;
+    }
+}