diff --git a/api/system-current.txt b/api/system-current.txt
index cdb83c6..f07f0c3 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -6027,7 +6027,7 @@
   }
 
   public class PhoneStateListener {
-    method public void onCallAttributesChanged(android.telephony.CallAttributes);
+    method public void onCallAttributesChanged(@NonNull android.telephony.CallAttributes);
     method public void onCallDisconnectCauseChanged(int, int);
     method public void onPreciseCallStateChanged(android.telephony.PreciseCallState);
     method public void onPreciseDataConnectionStateChanged(android.telephony.PreciseDataConnectionState);
diff --git a/services/core/java/com/android/server/TelephonyRegistry.java b/services/core/java/com/android/server/TelephonyRegistry.java
index 1798f38..cbfcd60 100644
--- a/services/core/java/com/android/server/TelephonyRegistry.java
+++ b/services/core/java/com/android/server/TelephonyRegistry.java
@@ -206,9 +206,10 @@
 
     private Map<Integer, List<EmergencyNumber>> mEmergencyNumberList;
 
-    private CallQuality mCallQuality;
+    private CallQuality mCallQuality = new CallQuality();
 
-    private CallAttributes mCallAttributes;
+    private CallAttributes mCallAttributes = new CallAttributes(new PreciseCallState(),
+            TelephonyManager.NETWORK_TYPE_UNKNOWN, new CallQuality());
 
     private int[] mSrvccState;
 
diff --git a/telephony/java/android/telephony/CallQuality.java b/telephony/java/android/telephony/CallQuality.java
index b27f6b4..cbe62284 100644
--- a/telephony/java/android/telephony/CallQuality.java
+++ b/telephony/java/android/telephony/CallQuality.java
@@ -92,6 +92,10 @@
         mCodecType = in.readInt();
     }
 
+    /** @hide **/
+    public CallQuality() {
+    }
+
     /**
      * Constructor.
      *
diff --git a/telephony/java/android/telephony/PhoneStateListener.java b/telephony/java/android/telephony/PhoneStateListener.java
index 9fee593..af324de 100644
--- a/telephony/java/android/telephony/PhoneStateListener.java
+++ b/telephony/java/android/telephony/PhoneStateListener.java
@@ -701,7 +701,7 @@
      * @hide
      */
     @SystemApi
-    public void onCallAttributesChanged(CallAttributes callAttributes) {
+    public void onCallAttributesChanged(@NonNull CallAttributes callAttributes) {
         // default implementation empty
     }