diff --git a/src/com/android/server/telecom/CallsManager.java b/src/com/android/server/telecom/CallsManager.java
index 48aa9e6..1eb65ad 100644
--- a/src/com/android/server/telecom/CallsManager.java
+++ b/src/com/android/server/telecom/CallsManager.java
@@ -154,6 +154,7 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
@@ -455,6 +456,9 @@
 
     private LinkedList<HandlerThread> mGraphHandlerThreads;
 
+    // An executor that can be used to fire off async tasks that do not block Telecom in any manner.
+    private final Executor mAsyncTaskExecutor;
+
     private boolean mHasActiveRttCall = false;
 
     private AnomalyReporterAdapter mAnomalyReporter = new AnomalyReporterAdapterImpl();
@@ -553,7 +557,8 @@
             RoleManagerAdapter roleManagerAdapter,
             ToastFactory toastFactory,
             CallEndpointControllerFactory callEndpointControllerFactory,
-            CallAnomalyWatchdog callAnomalyWatchdog) {
+            CallAnomalyWatchdog callAnomalyWatchdog,
+            Executor asyncTaskExecutor) {
         mContext = context;
         mLock = lock;
         mPhoneNumberUtilsAdapter = phoneNumberUtilsAdapter;
@@ -670,6 +675,7 @@
         mGraphHandlerThreads = new LinkedList<>();
 
         mCallAnomalyWatchdog = callAnomalyWatchdog;
+        mAsyncTaskExecutor = asyncTaskExecutor;
     }
 
     public void setIncomingCallNotifier(IncomingCallNotifier incomingCallNotifier) {
@@ -3327,7 +3333,8 @@
         setCallState(call, CallState.RINGING, "ringing set explicitly");
     }
 
-    void markCallAsDialing(Call call) {
+    @VisibleForTesting
+    public void markCallAsDialing(Call call) {
         setCallState(call, CallState.DIALING, "dialing set explicitly");
         maybeMoveToSpeakerPhone(call);
         maybeTurnOffMute(call);
@@ -4893,17 +4900,28 @@
         }
     }
 
+    /**
+     * Ensures that the call will be audible to the user by checking if the voice call stream is
+     * audible, and if not increasing the volume to the default value.
+     */
     private void ensureCallAudible() {
-        AudioManager am = mContext.getSystemService(AudioManager.class);
-        if (am == null) {
-            Log.w(this, "ensureCallAudible: audio manager is null");
-            return;
-        }
-        if (am.getStreamVolume(AudioManager.STREAM_VOICE_CALL) == 0) {
-            Log.i(this, "ensureCallAudible: voice call stream has volume 0. Adjusting to default.");
-            am.setStreamVolume(AudioManager.STREAM_VOICE_CALL,
-                    AudioSystem.getDefaultStreamVolume(AudioManager.STREAM_VOICE_CALL), 0);
-        }
+        // Audio manager APIs can be somewhat slow.  To prevent a potential ANR we will fire off
+        // this opreation on the async task executor.  Note that this operation does not have any
+        // dependency on any Telecom state, so we can safely launch this on a different thread
+        // without worrying that it is in the Telecom sync lock.
+        mAsyncTaskExecutor.execute(() -> {
+            AudioManager am = mContext.getSystemService(AudioManager.class);
+            if (am == null) {
+                Log.w(this, "ensureCallAudible: audio manager is null");
+                return;
+            }
+            if (am.getStreamVolume(AudioManager.STREAM_VOICE_CALL) == 0) {
+                Log.i(this,
+                        "ensureCallAudible: voice call stream has volume 0. Adjusting to default.");
+                am.setStreamVolume(AudioManager.STREAM_VOICE_CALL,
+                        AudioSystem.getDefaultStreamVolume(AudioManager.STREAM_VOICE_CALL), 0);
+            }
+        });
     }
 
     /**
diff --git a/src/com/android/server/telecom/TelecomSystem.java b/src/com/android/server/telecom/TelecomSystem.java
index 63852f3..4d1bca9 100644
--- a/src/com/android/server/telecom/TelecomSystem.java
+++ b/src/com/android/server/telecom/TelecomSystem.java
@@ -363,7 +363,8 @@
                     roleManagerAdapter,
                     toastFactory,
                     callEndpointControllerFactory,
-                    callAnomalyWatchdog);
+                    callAnomalyWatchdog,
+                    Executors.newSingleThreadExecutor());
 
             mIncomingCallNotifier = incomingCallNotifier;
             incomingCallNotifier.setCallsManagerProxy(new IncomingCallNotifier.CallsManagerProxy() {
diff --git a/tests/src/com/android/server/telecom/tests/CallsManagerTest.java b/tests/src/com/android/server/telecom/tests/CallsManagerTest.java
index 75a9a96..9876138 100644
--- a/tests/src/com/android/server/telecom/tests/CallsManagerTest.java
+++ b/tests/src/com/android/server/telecom/tests/CallsManagerTest.java
@@ -48,6 +48,7 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
+import android.media.AudioManager;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
@@ -136,6 +137,7 @@
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.Executor;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.TimeUnit;
 
@@ -294,7 +296,9 @@
                 mRoleManagerAdapter,
                 mToastFactory,
                 mCallEndpointControllerFactory,
-                mCallAnomalyWatchdog);
+                mCallAnomalyWatchdog,
+                // Just do async tasks synchronously to support testing.
+                command -> command.run());
 
         when(mPhoneAccountRegistrar.getPhoneAccount(
                 eq(SELF_MANAGED_HANDLE), any())).thenReturn(SELF_MANAGED_ACCOUNT);
@@ -2415,6 +2419,50 @@
 
     @MediumTest
     @Test
+    public void testSetCallDialingAndDontIncreaseVolume() {
+        // Start with a non zero volume.
+        mComponentContextFixture.getAudioManager().setStreamVolume(AudioManager.STREAM_VOICE_CALL,
+                4, 0 /* flags */);
+
+        Call call = mock(Call.class);
+        mCallsManager.markCallAsDialing(call);
+
+        // We set the volume to non-zero above, so expect 1
+        verify(mComponentContextFixture.getAudioManager(), times(1)).setStreamVolume(
+                eq(AudioManager.STREAM_VOICE_CALL), anyInt(), anyInt());
+    }
+    @MediumTest
+    @Test
+    public void testSetCallDialingAndIncreaseVolume() {
+        // Start with a zero volume stream.
+        mComponentContextFixture.getAudioManager().setStreamVolume(AudioManager.STREAM_VOICE_CALL,
+                0, 0 /* flags */);
+
+        Call call = mock(Call.class);
+        mCallsManager.markCallAsDialing(call);
+
+        // We set the volume to zero above, so expect 2
+        verify(mComponentContextFixture.getAudioManager(), times(2)).setStreamVolume(
+                eq(AudioManager.STREAM_VOICE_CALL), anyInt(), anyInt());
+    }
+
+    @MediumTest
+    @Test
+    public void testSetCallActiveAndDontIncreaseVolume() {
+        // Start with a non-zero volume.
+        mComponentContextFixture.getAudioManager().setStreamVolume(AudioManager.STREAM_VOICE_CALL,
+                4, 0 /* flags */);
+
+        Call call = mock(Call.class);
+        mCallsManager.markCallAsActive(call);
+
+        // We set the volume to non-zero above, so expect 1 only.
+        verify(mComponentContextFixture.getAudioManager(), times(1)).setStreamVolume(
+                eq(AudioManager.STREAM_VOICE_CALL), anyInt(), anyInt());
+    }
+
+    @MediumTest
+    @Test
     public void testHandoverToIsAccepted() {
         Call sourceCall = addSpyCall(CONNECTION_MGR_1_HANDLE, CallState.NEW);
         Call call = addSpyCall(CONNECTION_MGR_1_HANDLE, CallState.NEW);
diff --git a/tests/src/com/android/server/telecom/tests/ComponentContextFixture.java b/tests/src/com/android/server/telecom/tests/ComponentContextFixture.java
index 0743805..ea135eb 100644
--- a/tests/src/com/android/server/telecom/tests/ComponentContextFixture.java
+++ b/tests/src/com/android/server/telecom/tests/ComponentContextFixture.java
@@ -783,6 +783,10 @@
         return mTelephonyManager;
     }
 
+    public AudioManager getAudioManager() {
+        return mAudioManager;
+    }
+
     public CarrierConfigManager getCarrierConfigManager() {
         return mCarrierConfigManager;
     }