diff --git a/flags/telecom_callaudioroutestatemachine_flags.aconfig b/flags/telecom_callaudioroutestatemachine_flags.aconfig
index a3294c0..b0f14a4 100644
--- a/flags/telecom_callaudioroutestatemachine_flags.aconfig
+++ b/flags/telecom_callaudioroutestatemachine_flags.aconfig
@@ -8,6 +8,13 @@
 }
 
 flag {
+  name: "use_refactored_audio_route_switching"
+  namespace: "telecom"
+  description: "Refactored audio routing"
+  bug: "306395598"
+}
+
+flag {
   name: "ensure_audio_mode_updates_on_foreground_call_change"
   namespace: "telecom"
   description: "Ensure that the audio mode is updated anytime the foreground call changes."
diff --git a/src/com/android/server/telecom/CallAudioManager.java b/src/com/android/server/telecom/CallAudioManager.java
index 427b0ce..2201c2f 100644
--- a/src/com/android/server/telecom/CallAudioManager.java
+++ b/src/com/android/server/telecom/CallAudioManager.java
@@ -23,7 +23,6 @@
 import android.os.UserHandle;
 import android.telecom.CallAudioState;
 import android.telecom.Log;
-import android.telecom.PhoneAccount;
 import android.telecom.VideoProfile;
 import android.util.SparseArray;
 
@@ -55,7 +54,7 @@
     private final Set<Call> mCalls;
     private final SparseArray<LinkedHashSet<Call>> mCallStateToCalls;
 
-    private final CallAudioRouteStateMachine mCallAudioRouteStateMachine;
+    private final CallAudioRouteAdapter mCallAudioRouteAdapter;
     private final CallAudioModeStateMachine mCallAudioModeStateMachine;
     private final BluetoothStateReceiver mBluetoothStateReceiver;
     private final CallsManager mCallsManager;
@@ -71,7 +70,7 @@
     private boolean mIsDisconnectedTonePlaying = false;
     private InCallTonePlayer mHoldTonePlayer;
 
-    public CallAudioManager(CallAudioRouteStateMachine callAudioRouteStateMachine,
+    public CallAudioManager(CallAudioRouteAdapter callAudioRouteAdapter,
             CallsManager callsManager,
             CallAudioModeStateMachine callAudioModeStateMachine,
             InCallTonePlayer.Factory playerFactory,
@@ -97,7 +96,7 @@
             put(CallState.AUDIO_PROCESSING, mAudioProcessingCalls);
         }};
 
-        mCallAudioRouteStateMachine = callAudioRouteStateMachine;
+        mCallAudioRouteAdapter = callAudioRouteAdapter;
         mCallAudioModeStateMachine = callAudioModeStateMachine;
         mCallsManager = callsManager;
         mPlayerFactory = playerFactory;
@@ -109,7 +108,7 @@
 
         mPlayerFactory.setCallAudioManager(this);
         mCallAudioModeStateMachine.setCallAudioManager(this);
-        mCallAudioRouteStateMachine.setCallAudioManager(this);
+        mCallAudioRouteAdapter.setCallAudioManager(this);
     }
 
     @Override
@@ -226,7 +225,7 @@
                 // When pulling a video call, automatically enable the speakerphone.
                 Log.d(LOG_TAG, "Switching to speaker because external video call %s was pulled." +
                         call.getId());
-                mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+                mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                         CallAudioRouteStateMachine.SWITCH_SPEAKER);
             }
         }
@@ -378,7 +377,7 @@
     @Override
     public void onConnectionServiceChanged(Call call, ConnectionServiceWrapper oldCs,
             ConnectionServiceWrapper newCs) {
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.UPDATE_SYSTEM_AUDIO_ROUTE);
     }
 
@@ -396,13 +395,13 @@
             Log.d(LOG_TAG, "Switching to speaker because call %s transitioned video state from %s" +
                     " to %s", call.getId(), VideoProfile.videoStateToString(previousVideoState),
                     VideoProfile.videoStateToString(newVideoState));
-            mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+            mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                     CallAudioRouteStateMachine.SWITCH_SPEAKER);
         }
     }
 
     public CallAudioState getCallAudioState() {
-        return mCallAudioRouteStateMachine.getCurrentCallAudioState();
+        return mCallAudioRouteAdapter.getCurrentCallAudioState();
     }
 
     public Call getPossiblyHeldForegroundCall() {
@@ -423,7 +422,7 @@
             Log.v(this, "ignoring toggleMute for emergency call");
             return;
         }
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.TOGGLE_MUTE);
     }
 
@@ -443,7 +442,7 @@
             Log.v(this, "ignoring mute for emergency call");
         }
 
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(shouldMute
+        mCallAudioRouteAdapter.sendMessageWithSessionInfo(shouldMute
                 ? CallAudioRouteStateMachine.MUTE_ON : CallAudioRouteStateMachine.MUTE_OFF);
     }
 
@@ -459,23 +458,23 @@
         Log.v(this, "setAudioRoute, route: %s", CallAudioState.audioRouteToString(route));
         switch (route) {
             case CallAudioState.ROUTE_BLUETOOTH:
-                mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+                mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                         CallAudioRouteStateMachine.USER_SWITCH_BLUETOOTH, 0, bluetoothAddress);
                 return;
             case CallAudioState.ROUTE_SPEAKER:
-                mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+                mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                         CallAudioRouteStateMachine.USER_SWITCH_SPEAKER);
                 return;
             case CallAudioState.ROUTE_WIRED_HEADSET:
-                mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+                mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                         CallAudioRouteStateMachine.USER_SWITCH_HEADSET);
                 return;
             case CallAudioState.ROUTE_EARPIECE:
-                mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+                mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                         CallAudioRouteStateMachine.USER_SWITCH_EARPIECE);
                 return;
             case CallAudioState.ROUTE_WIRED_OR_EARPIECE:
-                mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+                mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                         CallAudioRouteStateMachine.USER_SWITCH_BASELINE_ROUTE,
                         CallAudioRouteStateMachine.NO_INCLUDE_BLUETOOTH_IN_BASELINE);
                 return;
@@ -490,7 +489,7 @@
      */
     void switchBaseline() {
         Log.i(this, "switchBaseline");
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.USER_SWITCH_BASELINE_ROUTE,
                 CallAudioRouteStateMachine.INCLUDE_BLUETOOTH_IN_BASELINE);
     }
@@ -534,7 +533,7 @@
         synchronized (mCallsManager.getLock()) {
             Call localForegroundCall = mForegroundCall;
             boolean result = mRinger.startRinging(localForegroundCall,
-                    mCallAudioRouteStateMachine.isHfpDeviceAvailable());
+                    mCallAudioRouteAdapter.isHfpDeviceAvailable());
             if (result) {
                 localForegroundCall.setStartRingTime();
             }
@@ -567,7 +566,7 @@
 
     @VisibleForTesting
     public void setCallAudioRouteFocusState(int focusState) {
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.SWITCH_FOCUS, focusState);
     }
 
@@ -577,8 +576,8 @@
     }
 
     @VisibleForTesting
-    public CallAudioRouteStateMachine getCallAudioRouteStateMachine() {
-        return mCallAudioRouteStateMachine;
+    public CallAudioRouteAdapter getCallAudioRouteAdapter() {
+        return mCallAudioRouteAdapter;
     }
 
     @VisibleForTesting
@@ -615,9 +614,9 @@
         mCallAudioModeStateMachine.dump(pw);
         pw.decreaseIndent();
 
-        pw.println("CallAudioRouteStateMachine:");
+        pw.println("mCallAudioRouteAdapter:");
         pw.increaseIndent();
-        mCallAudioRouteStateMachine.dump(pw);
+        mCallAudioRouteAdapter.dump(pw);
         pw.decreaseIndent();
 
         pw.println("BluetoothDeviceManager:");
@@ -813,7 +812,7 @@
                 mHoldingCalls.stream().map(c -> c.getId()).collect(Collectors.joining(","))
         );
         if (mForegroundCall != oldForegroundCall) {
-            mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+            mCallAudioRouteAdapter.sendMessageWithSessionInfo(
                     CallAudioRouteStateMachine.UPDATE_SYSTEM_AUDIO_ROUTE);
 
             if (mForegroundCall != null
diff --git a/src/com/android/server/telecom/CallAudioModeStateMachine.java b/src/com/android/server/telecom/CallAudioModeStateMachine.java
index f8c1997..71956a1 100644
--- a/src/com/android/server/telecom/CallAudioModeStateMachine.java
+++ b/src/com/android/server/telecom/CallAudioModeStateMachine.java
@@ -734,12 +734,12 @@
             mAudioManager.setMode(AudioManager.MODE_COMMUNICATION_REDIRECT);
             mMostRecentMode = AudioManager.MODE_NORMAL;
             mCallAudioManager.setCallAudioRouteFocusState(CallAudioRouteStateMachine.ACTIVE_FOCUS);
-            mCallAudioManager.getCallAudioRouteStateMachine().sendMessageWithSessionInfo(
+            mCallAudioManager.getCallAudioRouteAdapter().sendMessageWithSessionInfo(
                     CallAudioRouteStateMachine.STREAMING_FORCE_ENABLED);
         }
 
         private void preExit() {
-            mCallAudioManager.getCallAudioRouteStateMachine().sendMessageWithSessionInfo(
+            mCallAudioManager.getCallAudioRouteAdapter().sendMessageWithSessionInfo(
                     CallAudioRouteStateMachine.STREAMING_FORCE_DISABLED);
         }
 
diff --git a/src/com/android/server/telecom/CallAudioRouteAdapter.java b/src/com/android/server/telecom/CallAudioRouteAdapter.java
new file mode 100644
index 0000000..7f7b43c
--- /dev/null
+++ b/src/com/android/server/telecom/CallAudioRouteAdapter.java
@@ -0,0 +1,19 @@
+package com.android.server.telecom;
+
+import android.os.Handler;
+import android.telecom.CallAudioState;
+
+import com.android.internal.util.IndentingPrintWriter;
+
+public interface CallAudioRouteAdapter {
+    void initialize();
+    void sendMessageWithSessionInfo(int message);
+    void sendMessageWithSessionInfo(int message, int arg);
+    void sendMessageWithSessionInfo(int message, int arg, String data);
+    void sendMessage(int message, Runnable r);
+    void setCallAudioManager(CallAudioManager callAudioManager);
+    CallAudioState getCurrentCallAudioState();
+    boolean isHfpDeviceAvailable();
+    Handler getAdapterHandler();
+    void dump(IndentingPrintWriter pw);
+}
diff --git a/src/com/android/server/telecom/CallAudioRouteController.java b/src/com/android/server/telecom/CallAudioRouteController.java
new file mode 100644
index 0000000..f8c49bb
--- /dev/null
+++ b/src/com/android/server/telecom/CallAudioRouteController.java
@@ -0,0 +1,64 @@
+package com.android.server.telecom;
+
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Looper;
+import android.telecom.CallAudioState;
+
+import com.android.internal.util.IndentingPrintWriter;
+
+public class CallAudioRouteController implements CallAudioRouteAdapter {
+    private Handler mHandler;
+
+    public CallAudioRouteController() {
+        HandlerThread handlerThread = new HandlerThread(this.getClass().getSimpleName());
+        handlerThread.start();
+        mHandler = new Handler(handlerThread.getLooper());
+    }
+    @Override
+    public void initialize() {
+    }
+
+    @Override
+    public void sendMessageWithSessionInfo(int message) {
+    }
+
+    @Override
+    public void sendMessageWithSessionInfo(int message, int arg) {
+
+    }
+
+    @Override
+    public void sendMessageWithSessionInfo(int message, int arg, String data) {
+
+    }
+
+    @Override
+    public void sendMessage(int message, Runnable r) {
+
+    }
+
+    @Override
+    public void setCallAudioManager(CallAudioManager callAudioManager) {
+    }
+
+    @Override
+    public CallAudioState getCurrentCallAudioState() {
+        return null;
+    }
+
+    @Override
+    public boolean isHfpDeviceAvailable() {
+        return false;
+    }
+
+    @Override
+    public Handler getAdapterHandler() {
+        return mHandler;
+    }
+
+    @Override
+    public void dump(IndentingPrintWriter pw) {
+
+    }
+}
diff --git a/src/com/android/server/telecom/CallAudioRoutePeripheralAdapter.java b/src/com/android/server/telecom/CallAudioRoutePeripheralAdapter.java
index af0757c..8a87c22 100644
--- a/src/com/android/server/telecom/CallAudioRoutePeripheralAdapter.java
+++ b/src/com/android/server/telecom/CallAudioRoutePeripheralAdapter.java
@@ -25,17 +25,17 @@
 public class CallAudioRoutePeripheralAdapter implements WiredHeadsetManager.Listener,
         DockManager.Listener, BluetoothRouteManager.BluetoothStateListener {
 
-    private final CallAudioRouteStateMachine mCallAudioRouteStateMachine;
+    private final CallAudioRouteAdapter mCallAudioAdapter;
     private final BluetoothRouteManager mBluetoothRouteManager;
     private final AsyncRingtonePlayer mRingtonePlayer;
 
     public CallAudioRoutePeripheralAdapter(
-            CallAudioRouteStateMachine callAudioRouteStateMachine,
+            CallAudioRouteAdapter callAudioRouteAdapter,
             BluetoothRouteManager bluetoothManager,
             WiredHeadsetManager wiredHeadsetManager,
             DockManager dockManager,
             AsyncRingtonePlayer ringtonePlayer) {
-        mCallAudioRouteStateMachine = callAudioRouteStateMachine;
+        mCallAudioAdapter = callAudioRouteAdapter;
         mBluetoothRouteManager = bluetoothManager;
         mRingtonePlayer = ringtonePlayer;
 
@@ -60,26 +60,26 @@
 
     @Override
     public void onBluetoothDeviceListChanged() {
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.BLUETOOTH_DEVICE_LIST_CHANGED);
     }
 
     @Override
     public void onBluetoothActiveDevicePresent() {
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.BT_ACTIVE_DEVICE_PRESENT);
     }
 
     @Override
     public void onBluetoothActiveDeviceGone() {
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.BT_ACTIVE_DEVICE_GONE);
     }
 
     @Override
     public void onBluetoothAudioConnected() {
         mRingtonePlayer.updateBtActiveState(true);
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.BT_AUDIO_CONNECTED);
     }
 
@@ -87,20 +87,20 @@
     public void onBluetoothAudioConnecting() {
         mRingtonePlayer.updateBtActiveState(false);
         // Pretend like audio is connected when communicating w/ CARSM.
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.BT_AUDIO_CONNECTED);
     }
 
     @Override
     public void onBluetoothAudioDisconnected() {
         mRingtonePlayer.updateBtActiveState(false);
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.BT_AUDIO_DISCONNECTED);
     }
 
     @Override
     public void onUnexpectedBluetoothStateChange() {
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioAdapter.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.UPDATE_SYSTEM_AUDIO_ROUTE);
     }
 
@@ -111,17 +111,17 @@
     @Override
     public void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn) {
         if (!oldIsPluggedIn && newIsPluggedIn) {
-            mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+            mCallAudioAdapter.sendMessageWithSessionInfo(
                     CallAudioRouteStateMachine.CONNECT_WIRED_HEADSET);
         } else if (oldIsPluggedIn && !newIsPluggedIn){
-            mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+            mCallAudioAdapter.sendMessageWithSessionInfo(
                     CallAudioRouteStateMachine.DISCONNECT_WIRED_HEADSET);
         }
     }
 
     @Override
     public void onDockChanged(boolean isDocked) {
-        mCallAudioRouteStateMachine.sendMessageWithSessionInfo(
+        mCallAudioAdapter.sendMessageWithSessionInfo(
                 isDocked ? CallAudioRouteStateMachine.CONNECT_DOCK
                         : CallAudioRouteStateMachine.DISCONNECT_DOCK
         );
diff --git a/src/com/android/server/telecom/CallAudioRouteStateMachine.java b/src/com/android/server/telecom/CallAudioRouteStateMachine.java
index b89dbe2..cc5ee05 100644
--- a/src/com/android/server/telecom/CallAudioRouteStateMachine.java
+++ b/src/com/android/server/telecom/CallAudioRouteStateMachine.java
@@ -29,6 +29,7 @@
 import android.media.AudioManager;
 import android.media.IAudioService;
 import android.os.Binder;
+import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
 import android.os.RemoteException;
@@ -74,7 +75,7 @@
  *     from a wired headset
  * mIsMuted: a boolean indicating whether the audio is muted
  */
-public class CallAudioRouteStateMachine extends StateMachine {
+public class CallAudioRouteStateMachine extends StateMachine implements CallAudioRouteAdapter {
 
     public static class Factory {
         public CallAudioRouteStateMachine create(
@@ -1745,6 +1746,11 @@
         sendMessage(message, arg, 0, args);
     }
 
+    @Override
+    public void sendMessage(int message, Runnable r) {
+        super.sendMessage(message, r);
+    }
+
     /**
      * This is for state-independent changes in audio route (i.e. muting or runnables)
      * @param msg that couldn't be handled.
@@ -1811,7 +1817,7 @@
     }
 
     public void dumpPendingMessages(IndentingPrintWriter pw) {
-        getHandler().getLooper().dump(pw::println, "");
+        getAdapterHandler().getLooper().dump(pw::println, "");
     }
 
     public boolean isHfpDeviceAvailable() {
@@ -2175,4 +2181,8 @@
 
         return base;
     }
+
+    public Handler getAdapterHandler() {
+        return getHandler();
+    }
 }
diff --git a/src/com/android/server/telecom/CallsManager.java b/src/com/android/server/telecom/CallsManager.java
index 6afa01d..7fea8e0 100755
--- a/src/com/android/server/telecom/CallsManager.java
+++ b/src/com/android/server/telecom/CallsManager.java
@@ -606,24 +606,28 @@
 
         mDtmfLocalTonePlayer =
                 new DtmfLocalTonePlayer(new DtmfLocalTonePlayer.ToneGeneratorProxy());
-        CallAudioRouteStateMachine callAudioRouteStateMachine =
-                callAudioRouteStateMachineFactory.create(
-                        context,
-                        this,
-                        bluetoothManager,
-                        wiredHeadsetManager,
-                        statusBarNotifier,
-                        audioServiceFactory,
-                        CallAudioRouteStateMachine.EARPIECE_AUTO_DETECT,
-                        asyncCallAudioTaskExecutor,
-                        communicationDeviceTracker,
-                        featureFlags
-                );
-        callAudioRouteStateMachine.initialize();
+        CallAudioRouteAdapter callAudioRouteAdapter;
+        if (!featureFlags.useRefactoredAudioRouteSwitching()) {
+            callAudioRouteAdapter = callAudioRouteStateMachineFactory.create(
+                    context,
+                    this,
+                    bluetoothManager,
+                    wiredHeadsetManager,
+                    statusBarNotifier,
+                    audioServiceFactory,
+                    CallAudioRouteStateMachine.EARPIECE_AUTO_DETECT,
+                    asyncCallAudioTaskExecutor,
+                    communicationDeviceTracker,
+                    featureFlags
+            );
+        } else {
+            callAudioRouteAdapter = new CallAudioRouteController();
+        }
+        callAudioRouteAdapter.initialize();
 
         CallAudioRoutePeripheralAdapter callAudioRoutePeripheralAdapter =
                 new CallAudioRoutePeripheralAdapter(
-                        callAudioRouteStateMachine,
+                        callAudioRouteAdapter,
                         bluetoothManager,
                         wiredHeadsetManager,
                         mDockManager,
@@ -654,7 +658,7 @@
                 accessibilityManagerAdapter, featureFlags);
         mCallRecordingTonePlayer = new CallRecordingTonePlayer(mContext, audioManager,
                 mTimeoutsAdapter, mLock);
-        mCallAudioManager = new CallAudioManager(callAudioRouteStateMachine,
+        mCallAudioManager = new CallAudioManager(callAudioRouteAdapter,
                 this, callAudioModeStateMachineFactory.create(systemStateHelper,
                 (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE),
                 featureFlags, communicationDeviceTracker),
@@ -5513,7 +5517,7 @@
         mCallAudioManager.getCallAudioModeStateMachine().getHandler().post(() -> {
             mainHandlerLatch.countDown();
         });
-        mCallAudioManager.getCallAudioRouteStateMachine().getHandler().post(() -> {
+        mCallAudioManager.getCallAudioRouteAdapter().getAdapterHandler().post(() -> {
             mainHandlerLatch.countDown();
         });
 
diff --git a/tests/src/com/android/server/telecom/tests/AnalyticsTests.java b/tests/src/com/android/server/telecom/tests/AnalyticsTests.java
index 5da7f31..54aedc4 100644
--- a/tests/src/com/android/server/telecom/tests/AnalyticsTests.java
+++ b/tests/src/com/android/server/telecom/tests/AnalyticsTests.java
@@ -381,7 +381,7 @@
 
         waitForHandlerAction(
                 mTelecomSystem.getCallsManager().getCallAudioManager()
-                        .getCallAudioRouteStateMachine().getHandler(),
+                        .getCallAudioRouteAdapter().getAdapterHandler(),
                 TEST_TIMEOUT);
         waitForHandlerAction(
                 mTelecomSystem.getCallsManager().getCallAudioManager()
@@ -391,7 +391,7 @@
         mInCallServiceFixtureX.getInCallAdapter().setAudioRoute(CallAudioState.ROUTE_SPEAKER, null);
         waitForHandlerAction(
                 mTelecomSystem.getCallsManager().getCallAudioManager()
-                        .getCallAudioRouteStateMachine().getHandler(),
+                        .getCallAudioRouteAdapter().getAdapterHandler(),
                 TEST_TIMEOUT);
         waitForHandlerAction(
                 mTelecomSystem.getCallsManager().getCallAudioManager()
diff --git a/tests/src/com/android/server/telecom/tests/BasicCallTests.java b/tests/src/com/android/server/telecom/tests/BasicCallTests.java
index c3dbf87..14065ca 100644
--- a/tests/src/com/android/server/telecom/tests/BasicCallTests.java
+++ b/tests/src/com/android/server/telecom/tests/BasicCallTests.java
@@ -43,16 +43,12 @@
 import android.content.pm.PackageManager;
 import android.graphics.drawable.Icon;
 import android.media.AudioDeviceInfo;
-import android.media.AudioFocusRequest;
 import android.media.AudioManager;
 import android.net.Uri;
 import android.os.Binder;
 import android.os.Bundle;
-import android.os.Handler;
-import android.os.Looper;
 import android.os.Process;
 import android.os.UserHandle;
-import android.os.UserManager;
 import android.provider.BlockedNumberContract;
 import android.telecom.Call;
 import android.telecom.CallAudioState;
@@ -650,7 +646,7 @@
 
         mInCallServiceFixtureX.mInCallAdapter.setAudioRoute(CallAudioState.ROUTE_SPEAKER, null);
         waitForHandlerAction(mTelecomSystem.getCallsManager().getCallAudioManager()
-                .getCallAudioRouteStateMachine().getHandler(), TEST_TIMEOUT);
+                .getCallAudioRouteAdapter().getAdapterHandler(), TEST_TIMEOUT);
         ArgumentCaptor<AudioDeviceInfo> infoArgumentCaptor =
                 ArgumentCaptor.forClass(AudioDeviceInfo.class);
         verify(audioManager, timeout(TEST_TIMEOUT).atLeast(1))
@@ -658,7 +654,7 @@
         assertEquals(AudioDeviceInfo.TYPE_BUILTIN_SPEAKER, infoArgumentCaptor.getValue().getType());
         mInCallServiceFixtureX.mInCallAdapter.setAudioRoute(CallAudioState.ROUTE_EARPIECE, null);
         waitForHandlerAction(mTelecomSystem.getCallsManager().getCallAudioManager()
-                .getCallAudioRouteStateMachine().getHandler(), TEST_TIMEOUT);
+                .getCallAudioRouteAdapter().getAdapterHandler(), TEST_TIMEOUT);
         // setSpeakerPhoneOn(false) gets called once during the call initiation phase
         verify(audioManager, timeout(TEST_TIMEOUT).atLeast(1))
                 .clearCommunicationDevice();
@@ -669,7 +665,7 @@
         waitForHandlerAction(mTelecomSystem.getCallsManager().getCallAudioManager()
                 .getCallAudioModeStateMachine().getHandler(), TEST_TIMEOUT);
         waitForHandlerAction(mTelecomSystem.getCallsManager().getCallAudioManager()
-                .getCallAudioRouteStateMachine().getHandler(), TEST_TIMEOUT);
+                .getCallAudioRouteAdapter().getAdapterHandler(), TEST_TIMEOUT);
         verify(audioManager, timeout(TEST_TIMEOUT))
                 .abandonAudioFocusForCall();
         verify(audioManager, timeout(TEST_TIMEOUT).atLeastOnce())
@@ -1199,7 +1195,7 @@
                 .getState());
         mInCallServiceFixtureX.mInCallAdapter.mute(true);
         waitForHandlerAction(mTelecomSystem.getCallsManager().getCallAudioManager()
-                .getCallAudioRouteStateMachine().getHandler(), TEST_TIMEOUT);
+                .getCallAudioRouteAdapter().getAdapterHandler(), TEST_TIMEOUT);
         assertTrue(mTelecomSystem.getCallsManager().getAudioState().isMuted());
 
         // Make an emergency call.
@@ -1208,14 +1204,14 @@
         assertEquals(Call.STATE_DIALING, mInCallServiceFixtureX.getCall(emergencyCall.mCallId)
                 .getState());
         waitForHandlerAction(mTelecomSystem.getCallsManager().getCallAudioManager()
-                .getCallAudioRouteStateMachine().getHandler(), TEST_TIMEOUT);
+                .getCallAudioRouteAdapter().getAdapterHandler(), TEST_TIMEOUT);
         // Should be unmute automatically.
         assertFalse(mTelecomSystem.getCallsManager().getAudioState().isMuted());
 
         // Toggle mute during an emergency call.
         mTelecomSystem.getCallsManager().getCallAudioManager().toggleMute();
         waitForHandlerAction(mTelecomSystem.getCallsManager().getCallAudioManager()
-                .getCallAudioRouteStateMachine().getHandler(), TEST_TIMEOUT);
+                .getCallAudioRouteAdapter().getAdapterHandler(), TEST_TIMEOUT);
         // Should keep unmute.
         assertFalse(mTelecomSystem.getCallsManager().getAudioState().isMuted());
 
diff --git a/tests/src/com/android/server/telecom/tests/CallAudioModeStateMachineTest.java b/tests/src/com/android/server/telecom/tests/CallAudioModeStateMachineTest.java
index 652e5ce..cddf2ad 100644
--- a/tests/src/com/android/server/telecom/tests/CallAudioModeStateMachineTest.java
+++ b/tests/src/com/android/server/telecom/tests/CallAudioModeStateMachineTest.java
@@ -68,7 +68,7 @@
         mTestThread = new HandlerThread("CallAudioModeStateMachineTest");
         mTestThread.start();
         super.setUp();
-        when(mCallAudioManager.getCallAudioRouteStateMachine())
+        when(mCallAudioManager.getCallAudioRouteAdapter())
                 .thenReturn(mCallAudioRouteStateMachine);
         when(mFeatureFlags.telecomResolveHiddenDependencies()).thenReturn(false);
     }
diff --git a/tests/src/com/android/server/telecom/tests/CallAudioRouteStateMachineTest.java b/tests/src/com/android/server/telecom/tests/CallAudioRouteStateMachineTest.java
index 6dd93e5..19dfe83 100644
--- a/tests/src/com/android/server/telecom/tests/CallAudioRouteStateMachineTest.java
+++ b/tests/src/com/android/server/telecom/tests/CallAudioRouteStateMachineTest.java
@@ -213,8 +213,8 @@
         stateMachine.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.UPDATE_SYSTEM_AUDIO_ROUTE);
 
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // assert expected end state
         assertEquals(stateMachine.getCurrentCallAudioState().getRoute(),
@@ -315,8 +315,8 @@
         stateMachine.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.UPDATE_SYSTEM_AUDIO_ROUTE);
 
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         CallAudioState expectedCallAudioState = stateMachine.getLastKnownCallAudioState();
 
@@ -414,14 +414,14 @@
         CallAudioState expectedMiddleState = new CallAudioState(false,
                 CallAudioState.ROUTE_WIRED_HEADSET,
                 CallAudioState.ROUTE_WIRED_HEADSET | CallAudioState.ROUTE_SPEAKER);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         verifyNewSystemCallAudioState(initState, expectedMiddleState);
         resetMocks();
 
         stateMachine.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.DISCONNECT_WIRED_HEADSET);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         verifyNewSystemCallAudioState(expectedMiddleState, initState);
     }
 
@@ -460,7 +460,7 @@
                 CallAudioState.ROUTE_EARPIECE,
                 CallAudioState.ROUTE_EARPIECE | CallAudioState.ROUTE_BLUETOOTH);
 
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         verifyNewSystemCallAudioState(initState, expectedEndState);
         resetMocks();
         stateMachine.sendMessageWithSessionInfo(
@@ -468,7 +468,7 @@
         stateMachine.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.BT_ACTIVE_DEVICE_PRESENT);
 
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         assertEquals(expectedEndState, stateMachine.getCurrentCallAudioState());
     }
 
@@ -511,12 +511,12 @@
                 CallAudioState.ROUTE_EARPIECE | CallAudioState.ROUTE_BLUETOOTH,
                 null, availableDevices);
 
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         verifyNewSystemCallAudioState(initState, expectedMidState);
         // clear out the handler state before resetting mocks in order to avoid introducing a
         // CallAudioState that has a null list of supported BT devices
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         resetMocks();
 
         // Now, switch back to BT explicitly
@@ -534,9 +534,9 @@
                 CallAudioState.ROUTE_BLUETOOTH,
                 CallAudioState.ROUTE_EARPIECE | CallAudioState.ROUTE_BLUETOOTH,
                 bluetoothDevice1, availableDevices);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         // second wait needed for the BT_AUDIO_CONNECTED message
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         verifyNewSystemCallAudioState(expectedMidState, expectedEndState);
 
         stateMachine.sendMessageWithSessionInfo(
@@ -546,9 +546,9 @@
         stateMachine.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.BT_ACTIVE_DEVICE_PRESENT);
 
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         // second wait needed for the BT_AUDIO_CONNECTED message
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         // Verify that we're still on bluetooth.
         assertEquals(expectedEndState, stateMachine.getCurrentCallAudioState());
     }
@@ -582,13 +582,13 @@
 
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.RINGING_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         verify(mockBluetoothRouteManager, never()).connectBluetoothAudio(nullable(String.class));
 
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         verify(mockBluetoothRouteManager, times(1)).connectBluetoothAudio(nullable(String.class));
     }
 
@@ -620,7 +620,7 @@
                 CallAudioRouteStateMachine.RINGING_FOCUS);
         // Wait for the state machine to finish transiting to ActiveEarpiece before hooking up
         // bluetooth mocks
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         when(mockBluetoothRouteManager.isBluetoothAvailable()).thenReturn(true);
         when(mockBluetoothRouteManager.getConnectedDevices())
@@ -629,7 +629,7 @@
                 CallAudioRouteStateMachine.BLUETOOTH_DEVICE_LIST_CHANGED);
         stateMachine.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.BT_ACTIVE_DEVICE_PRESENT);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         verify(mockBluetoothRouteManager, never()).connectBluetoothAudio(null);
         CallAudioState expectedEndState = new CallAudioState(false,
@@ -640,13 +640,13 @@
 
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         verify(mockBluetoothRouteManager, times(1)).connectBluetoothAudio(null);
 
         when(mockBluetoothRouteManager.getBluetoothAudioConnectedDevice())
                 .thenReturn(bluetoothDevice1);
         stateMachine.sendMessage(CallAudioRouteStateMachine.BT_AUDIO_CONNECTED);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         // It is possible that this will be called twice from ActiveBluetoothRoute#enter. The extra
         // call to setBluetoothOn will trigger BT_AUDIO_CONNECTED, which also ends up invoking
         // CallAudioManager#onRingerModeChange.
@@ -693,10 +693,10 @@
 
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.USER_SWITCH_BLUETOOTH,
                 0, bluetoothDevice2.getAddress());
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         verify(mockBluetoothRouteManager).connectBluetoothAudio(bluetoothDevice2.getAddress());
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         CallAudioState expectedEndState = new CallAudioState(false,
                 CallAudioState.ROUTE_BLUETOOTH,
                 CallAudioState.ROUTE_EARPIECE | CallAudioState.ROUTE_BLUETOOTH,
@@ -752,14 +752,14 @@
 
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.NO_FOCUS, bluetoothDevice1.getAddress());
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         verify(mockBluetoothRouteManager).disconnectAudio();
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         CallAudioState expectedEndState = new CallAudioState(false,
                 CallAudioState.ROUTE_BLUETOOTH,
                 CallAudioState.ROUTE_EARPIECE | CallAudioState.ROUTE_BLUETOOTH,
@@ -792,13 +792,13 @@
 
         // Raise a dock connect event.
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.CONNECT_DOCK);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         assertTrue(!stateMachine.isInActiveState());
         verify(mockAudioManager, never()).setSpeakerphoneOn(eq(true));
 
         // Raise a dock disconnect event.
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.DISCONNECT_DOCK);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         assertTrue(!stateMachine.isInActiveState());
         verify(mockAudioManager, never()).setSpeakerphoneOn(eq(false));
     }
@@ -829,7 +829,7 @@
         // Switch to active, pretending that a call came in.
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Make sure that we've successfully switched to the active speaker route and that we've
         // called setSpeakerOn
@@ -876,7 +876,7 @@
         // Switch to active, pretending that a call came in.
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Make sure that we've successfully switched to the active BT route and that we've
         // called connectAudio on the right device.
@@ -887,7 +887,7 @@
         // Switch to inactive, pretending that the call disconnected.
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.NO_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Make sure that we've successfully switched to the quiescent BT route
         assertEquals(CallAudioState.ROUTE_BLUETOOTH,
@@ -933,7 +933,7 @@
         // Switch to active
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Make sure that we've successfully switched to the active earpiece and that we set the
         // communication device.
@@ -947,7 +947,7 @@
         // Route earpiece to speaker
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_SPEAKER,
                 CallAudioRouteStateMachine.SPEAKER_ON);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Assert that communication device was cleared
         verify(mockAudioManager).clearCommunicationDevice();
@@ -995,7 +995,7 @@
         // Switch to active
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Make sure that we've successfully switched to the active route on BT
         assertTrue(stateMachine.isInActiveState());
@@ -1118,12 +1118,12 @@
         CallAudioState expectedEndState = new CallAudioState(false,
                 CallAudioState.ROUTE_STREAMING, CallAudioState.ROUTE_STREAMING);
 
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         verifyNewSystemCallAudioState(initState, expectedEndState);
         resetMocks();
         stateMachine.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.STREAMING_FORCE_DISABLED);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         assertEquals(initState, stateMachine.getCurrentCallAudioState());
     }
 
@@ -1209,7 +1209,7 @@
         // Switch to active
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Make sure that we've successfully switched to the active headset.
         assertTrue(stateMachine.isInActiveState());
@@ -1231,7 +1231,7 @@
         // available route.
         stateMachine.sendMessageWithSessionInfo(
                 CallAudioRouteStateMachine.DISCONNECT_WIRED_HEADSET);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
         CallAudioState expectedState = new CallAudioState(false, CallAudioState.ROUTE_EARPIECE,
                 CallAudioState.ROUTE_EARPIECE | CallAudioState.ROUTE_BLUETOOTH,
                 null, availableDevices);
@@ -1334,7 +1334,7 @@
         // Switch to active
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Make sure that we've successfully switched to the active headset and that we set the
         // communication device.
@@ -1348,7 +1348,7 @@
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.SWITCH_FOCUS,
                 CallAudioRouteStateMachine.ACTIVE_FOCUS);
         stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.USER_SWITCH_EARPIECE);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Assert that communication device was cleared
         verify(mockAudioManager).clearCommunicationDevice();
diff --git a/tests/src/com/android/server/telecom/tests/CallAudioRouteTransitionTests.java b/tests/src/com/android/server/telecom/tests/CallAudioRouteTransitionTests.java
index 2c62752..25c4e9f 100644
--- a/tests/src/com/android/server/telecom/tests/CallAudioRouteTransitionTests.java
+++ b/tests/src/com/android/server/telecom/tests/CallAudioRouteTransitionTests.java
@@ -295,17 +295,17 @@
         if (mParams.initialRoute == CallAudioState.ROUTE_BLUETOOTH) {
             stateMachine.sendMessageWithSessionInfo(CallAudioRouteStateMachine.BT_AUDIO_CONNECTED);
         }
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         // Clear invocations on mocks to discard stuff from initialization
         clearInvocations();
 
         sendActionToStateMachine(stateMachine);
 
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
-        Handler h = stateMachine.getHandler();
+        Handler h = stateMachine.getAdapterHandler();
         waitForHandlerAction(h, TEST_TIMEOUT);
         stateMachine.quitStateMachine();
 
@@ -397,8 +397,8 @@
         // Omit the focus-getting statement
         sendActionToStateMachine(stateMachine);
 
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
-        waitForHandlerAction(stateMachine.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(stateMachine.getAdapterHandler(), TEST_TIMEOUT);
 
         stateMachine.quitStateMachine();
 
diff --git a/tests/src/com/android/server/telecom/tests/TelecomSystemTest.java b/tests/src/com/android/server/telecom/tests/TelecomSystemTest.java
index d7ba6e8..33b0068 100644
--- a/tests/src/com/android/server/telecom/tests/TelecomSystemTest.java
+++ b/tests/src/com/android/server/telecom/tests/TelecomSystemTest.java
@@ -500,6 +500,7 @@
         when(mRoleManagerAdapter.getCallCompanionApps()).thenReturn(Collections.emptyList());
         when(mRoleManagerAdapter.getDefaultCallScreeningApp(any(UserHandle.class)))
                 .thenReturn(null);
+        when(mFeatureFlags.useRefactoredAudioRouteSwitching()).thenReturn(false);
         mTelecomSystem = new TelecomSystem(
                 mComponentContextFixture.getTestDouble(),
                 (context, phoneAccountRegistrar, defaultDialerCache, mDeviceIdleControllerAdapter,
diff --git a/tests/src/com/android/server/telecom/tests/VideoCallTests.java b/tests/src/com/android/server/telecom/tests/VideoCallTests.java
index 84beedc..c77a614 100644
--- a/tests/src/com/android/server/telecom/tests/VideoCallTests.java
+++ b/tests/src/com/android/server/telecom/tests/VideoCallTests.java
@@ -32,6 +32,7 @@
 import android.test.suitebuilder.annotation.MediumTest;
 
 import com.android.server.telecom.CallAudioModeStateMachine;
+import com.android.server.telecom.CallAudioRouteAdapter;
 import com.android.server.telecom.CallAudioRouteStateMachine;
 
 import java.util.List;
@@ -258,13 +259,13 @@
      */
     private void verifyAudioRoute(int expectedRoute) throws Exception {
         // Capture all onCallAudioStateChanged callbacks to InCall.
-        CallAudioRouteStateMachine carsm = mTelecomSystem.getCallsManager()
-                .getCallAudioManager().getCallAudioRouteStateMachine();
+        CallAudioRouteAdapter cara = mTelecomSystem.getCallsManager()
+                .getCallAudioManager().getCallAudioRouteAdapter();
         CallAudioModeStateMachine camsm = mTelecomSystem.getCallsManager()
                 .getCallAudioManager().getCallAudioModeStateMachine();
         waitForHandlerAction(camsm.getHandler(), TEST_TIMEOUT);
         final boolean[] success = {true};
-        carsm.sendMessage(CallAudioRouteStateMachine.RUN_RUNNABLE, (Runnable) () -> {
+        cara.sendMessage(CallAudioRouteStateMachine.RUN_RUNNABLE, (Runnable) () -> {
             ArgumentCaptor<CallAudioState> callAudioStateArgumentCaptor = ArgumentCaptor.forClass(
                     CallAudioState.class);
             try {
@@ -277,7 +278,7 @@
             assertEquals(expectedRoute, changes.get(changes.size() - 1).getRoute());
             success[0] = true;
         });
-        waitForHandlerAction(carsm.getHandler(), TEST_TIMEOUT);
+        waitForHandlerAction(cara.getAdapterHandler(), TEST_TIMEOUT);
         assertTrue(success[0]);
     }
 }