diff --git a/InCallUI/src/com/android/incallui/ringtone/InCallTonePlayer.java b/InCallUI/src/com/android/incallui/ringtone/InCallTonePlayer.java
new file mode 100644
index 0000000..2a94f22
--- /dev/null
+++ b/InCallUI/src/com/android/incallui/ringtone/InCallTonePlayer.java
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2016 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.incallui.ringtone;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Preconditions;
+
+import android.media.AudioManager;
+import android.media.ToneGenerator;
+import android.provider.MediaStore.Audio;
+import android.support.annotation.Nullable;
+
+import com.android.contacts.common.testing.NeededForTesting;
+import com.android.dialer.compat.CallAudioStateCompat;
+import com.android.incallui.AudioModeProvider;
+import com.android.incallui.Log;
+import com.android.incallui.async.PausableExecutor;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import javax.annotation.concurrent.NotThreadSafe;
+
+/**
+ * Class responsible for playing in-call related tones in a background thread. This class only
+ * allows one tone to be played at a time.
+ */
+@NeededForTesting
+public class InCallTonePlayer {
+
+    public static final int TONE_CALL_WAITING = 4;
+
+    public static final int VOLUME_RELATIVE_HIGH_PRIORITY = 80;
+
+    private final AudioModeProvider mAudioModeProvider;
+    private final ToneGeneratorFactory mToneGeneratorFactory;
+    private final PausableExecutor mExecutor;
+    private @Nullable CountDownLatch mNumPlayingTones;
+
+    /**
+     * Creates a new InCallTonePlayer.
+     *
+     * @param audioModeProvider the {@link AudioModeProvider} used to determine through which stream
+     * to play tones.
+     * @param toneGeneratorFactory the {@link ToneGeneratorFactory} used to create
+     * {@link ToneGenerator}s.
+     * @param executor the {@link PausableExecutor} used to play tones in a background thread.
+     * @throws NullPointerException if audioModeProvider, toneGeneratorFactory, or executor are
+     * {@code null}.
+     */
+    @NeededForTesting
+    public InCallTonePlayer(AudioModeProvider audioModeProvider,
+            ToneGeneratorFactory toneGeneratorFactory, PausableExecutor executor) {
+        mAudioModeProvider = Preconditions.checkNotNull(audioModeProvider);
+        mToneGeneratorFactory = Preconditions.checkNotNull(toneGeneratorFactory);
+        mExecutor = Preconditions.checkNotNull(executor);
+    }
+
+    /**
+     * @return {@code true} if a tone is currently playing, {@code false} otherwise
+     */
+    @NeededForTesting
+    public boolean isPlayingTone() {
+        return mNumPlayingTones != null && mNumPlayingTones.getCount() > 0;
+    }
+
+    /**
+     * Plays the given tone in a background thread.
+     *
+     * @param tone the tone to play.
+     * @throws IllegalStateException if a tone is already playing
+     * @throws IllegalArgumentException if the tone is invalid
+     */
+    @NeededForTesting
+    public void play(int tone) {
+        if (isPlayingTone()) {
+            throw new IllegalStateException("Tone already playing");
+        }
+        final ToneGeneratorInfo info = getToneGeneratorInfo(tone);
+        mNumPlayingTones = new CountDownLatch(1);
+        mExecutor.execute(new Runnable() {
+            @Override
+            public void run() {
+                playOnBackgroundThread(info);
+            }
+        });
+    }
+
+    private ToneGeneratorInfo getToneGeneratorInfo(int tone) {
+        int stream = getPlaybackStream();
+        switch (tone) {
+            case TONE_CALL_WAITING:
+                return new ToneGeneratorInfo(ToneGenerator.TONE_SUP_CALL_WAITING,
+                        VOLUME_RELATIVE_HIGH_PRIORITY,
+                        Integer.MAX_VALUE,
+                        stream);
+            default:
+                throw new IllegalArgumentException("Bad tone: " + tone);
+        }
+    }
+
+    private int getPlaybackStream() {
+        if (mAudioModeProvider.getAudioMode() == CallAudioStateCompat.ROUTE_BLUETOOTH) {
+            // TODO (maxwelb): b/26932998 play through bluetooth
+            // return AudioManager.STREAM_BLUETOOTH_SCO;
+        }
+        return AudioManager.STREAM_VOICE_CALL;
+    }
+
+    private void playOnBackgroundThread(ToneGeneratorInfo info) {
+        // TODO (maxwelb): b/26936902 respect Do Not Disturb setting
+        ToneGenerator toneGenerator = null;
+        try {
+            Log.v(this, "Starting tone " + info);
+            toneGenerator = mToneGeneratorFactory.newInCallToneGenerator(info.stream, info.volume);
+            toneGenerator.startTone(info.tone);
+            /*
+             * During tests, this will block until the tests call mExecutor.ackMilestone. This call
+             * allows for synchronization to the point where the tone has started playing.
+             */
+            mExecutor.milestone();
+            if (mNumPlayingTones != null) {
+                mNumPlayingTones.await(info.toneLengthMillis, TimeUnit.MILLISECONDS);
+                // Allows for synchronization to the point where the tone has completed playing.
+                mExecutor.milestone();
+            }
+        } catch (InterruptedException e) {
+            Log.w(this, "Interrupted while playing in-call tone.");
+        } finally {
+            if (toneGenerator != null) {
+                toneGenerator.release();
+            }
+            if (mNumPlayingTones != null) {
+                mNumPlayingTones.countDown();
+            }
+            // Allows for synchronization to the point where this background thread has cleaned up.
+            mExecutor.milestone();
+        }
+    }
+
+    /**
+     * Stops playback of the current tone.
+     */
+    @NeededForTesting
+    public void stop() {
+        if (mNumPlayingTones != null) {
+            mNumPlayingTones.countDown();
+        }
+    }
+
+    private static class ToneGeneratorInfo {
+        public final int tone;
+        public final int volume;
+        public final int toneLengthMillis;
+        public final int stream;
+
+        public ToneGeneratorInfo(int toneGeneratorType, int volume, int toneLengthMillis,
+                int stream) {
+            this.tone = toneGeneratorType;
+            this.volume = volume;
+            this.toneLengthMillis = toneLengthMillis;
+            this.stream = stream;
+        }
+
+        @Override
+        public String toString() {
+            return MoreObjects.toStringHelper(this)
+                    .add("tone", tone)
+                    .add("volume", volume)
+                    .add("toneLengthMillis", toneLengthMillis).toString();
+        }
+    }
+}
diff --git a/InCallUI/tests/src/com/android/incallui/async/SingleProdThreadExecutor.java b/InCallUI/tests/src/com/android/incallui/async/SingleProdThreadExecutor.java
index ee27862..839bb2e 100644
--- a/InCallUI/tests/src/com/android/incallui/async/SingleProdThreadExecutor.java
+++ b/InCallUI/tests/src/com/android/incallui/async/SingleProdThreadExecutor.java
@@ -22,7 +22,8 @@
 
 /**
  * {@link PausableExecutor} for use in tests. It is intended to be used between one test thread
- * and one prod thread.
+ * and one prod thread. See {@link com.android.incallui.ringtone.InCallTonePlayerTest} for example
+ * usage.
  */
 @ThreadSafe
 public final class SingleProdThreadExecutor implements PausableExecutor {
diff --git a/InCallUI/tests/src/com/android/incallui/ringtone/InCallTonePlayerTest.java b/InCallUI/tests/src/com/android/incallui/ringtone/InCallTonePlayerTest.java
new file mode 100644
index 0000000..096d211
--- /dev/null
+++ b/InCallUI/tests/src/com/android/incallui/ringtone/InCallTonePlayerTest.java
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2016 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.incallui.ringtone;
+
+import android.media.AudioManager;
+import android.media.ToneGenerator;
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.SmallTest;
+
+import com.android.incallui.AudioModeProvider;
+import com.android.incallui.async.PausableExecutor;
+import com.android.incallui.async.SingleProdThreadExecutor;
+
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+
+@SmallTest
+public class InCallTonePlayerTest extends AndroidTestCase {
+
+    @Mock private AudioModeProvider mAudioModeProvider;
+    @Mock private ToneGeneratorFactory mToneGeneratorFactory;
+    @Mock private ToneGenerator mToneGenerator;
+    private InCallTonePlayer mInCallTonePlayer;
+
+    /*
+     * InCallTonePlayer milestones:
+     * 1) After tone starts playing
+     * 2) After tone finishes waiting (could have timed out)
+     * 3) After cleaning up state to allow new tone to play
+     */
+    private PausableExecutor mExecutor;
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+        MockitoAnnotations.initMocks(this);
+        Mockito.when(mToneGeneratorFactory.newInCallToneGenerator(Mockito.anyInt(),
+                Mockito.anyInt())).thenReturn(mToneGenerator);
+        mExecutor = new SingleProdThreadExecutor();
+        mInCallTonePlayer = new InCallTonePlayer(mAudioModeProvider, mToneGeneratorFactory,
+                mExecutor);
+    }
+
+    @Override
+    public void tearDown() throws Exception {
+        super.tearDown();
+        // Stop any playing so the InCallTonePlayer isn't stuck waiting for the tone to complete
+        mInCallTonePlayer.stop();
+        // 3 milestones in InCallTonePlayer, ack them to ensure that the prod thread doesn't block
+        // forever. It's fine to ack for more milestones than are hit
+        mExecutor.ackMilestoneForTesting();
+        mExecutor.ackMilestoneForTesting();
+        mExecutor.ackMilestoneForTesting();
+    }
+
+    public void testIsPlayingTone_False() {
+        assertFalse(mInCallTonePlayer.isPlayingTone());
+    }
+
+    public void testIsPlayingTone_True() throws InterruptedException {
+        mInCallTonePlayer.play(InCallTonePlayer.TONE_CALL_WAITING);
+        mExecutor.awaitMilestoneForTesting();
+
+        assertTrue(mInCallTonePlayer.isPlayingTone());
+    }
+
+    public void testPlay_InvalidTone() {
+        try {
+            mInCallTonePlayer.play(Integer.MIN_VALUE);
+            fail();
+        } catch (IllegalArgumentException e) {}
+    }
+
+    public void testPlay_CurrentlyPlaying() throws InterruptedException {
+        mInCallTonePlayer.play(InCallTonePlayer.TONE_CALL_WAITING);
+        mExecutor.awaitMilestoneForTesting();
+        try {
+            mInCallTonePlayer.play(InCallTonePlayer.TONE_CALL_WAITING);
+            fail();
+        } catch (IllegalStateException e) {}
+    }
+
+    public void testPlay_BlueToothStream() {
+        // TODO (maxwelb): b/26932998 play through bluetooth
+    }
+
+    public void testPlay_VoiceCallStream() throws InterruptedException {
+        mInCallTonePlayer.play(InCallTonePlayer.TONE_CALL_WAITING);
+        mExecutor.awaitMilestoneForTesting();
+        Mockito.verify(mToneGeneratorFactory).newInCallToneGenerator(AudioManager.STREAM_VOICE_CALL,
+                InCallTonePlayer.VOLUME_RELATIVE_HIGH_PRIORITY);
+    }
+
+    public void testPlay_Single() throws InterruptedException {
+        mInCallTonePlayer.play(InCallTonePlayer.TONE_CALL_WAITING);
+        mExecutor.awaitMilestoneForTesting();
+        mExecutor.ackMilestoneForTesting();
+        mInCallTonePlayer.stop();
+        mExecutor.ackMilestoneForTesting();
+        mExecutor.awaitMilestoneForTesting();
+        mExecutor.ackMilestoneForTesting();
+
+        Mockito.verify(mToneGenerator).startTone(ToneGenerator.TONE_SUP_CALL_WAITING);
+    }
+
+    public void testPlay_Consecutive() throws InterruptedException {
+        mInCallTonePlayer.play(InCallTonePlayer.TONE_CALL_WAITING);
+        mExecutor.awaitMilestoneForTesting();
+        mExecutor.ackMilestoneForTesting();
+        // Prevent waiting forever
+        mInCallTonePlayer.stop();
+        mExecutor.ackMilestoneForTesting();
+        mExecutor.awaitMilestoneForTesting();
+        mExecutor.ackMilestoneForTesting();
+
+        mInCallTonePlayer.play(InCallTonePlayer.TONE_CALL_WAITING);
+        mExecutor.awaitMilestoneForTesting();
+        mExecutor.ackMilestoneForTesting();
+        mInCallTonePlayer.stop();
+        mExecutor.ackMilestoneForTesting();
+        mExecutor.awaitMilestoneForTesting();
+        mExecutor.ackMilestoneForTesting();
+
+        Mockito.verify(mToneGenerator, Mockito.times(2))
+                .startTone(ToneGenerator.TONE_SUP_CALL_WAITING);
+    }
+
+    public void testStop_NotPlaying() {
+        // No crash
+        mInCallTonePlayer.stop();
+    }
+
+    public void testStop() throws InterruptedException {
+        mInCallTonePlayer.play(InCallTonePlayer.TONE_CALL_WAITING);
+        mExecutor.awaitMilestoneForTesting();
+
+        mInCallTonePlayer.stop();
+        mExecutor.ackMilestoneForTesting();
+        mExecutor.awaitMilestoneForTesting();
+
+        assertFalse(mInCallTonePlayer.isPlayingTone());
+    }
+}