diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 08477884fea9d..27741c71d62d2 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -442,6 +442,13 @@ public class CarrierConfigManager {
     public static final String KEY_DISABLE_SEVERE_WHEN_EXTREME_DISABLED_BOOL =
             "disable_severe_when_extreme_disabled_bool";
 
+    /**
+     * The message expiration time in milliseconds for duplicate detection purposes.
+     * @hide
+     */
+    public static final String KEY_MESSAGE_EXPIRATION_TIME_LONG =
+            "message_expiration_time_long";
+
     /**
      * The data call retry configuration for different types of APN.
      * @hide
@@ -1064,6 +1071,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_BROADCAST_EMERGENCY_CALL_STATE_CHANGES_BOOL, false);
         sDefaults.putBoolean(KEY_ALWAYS_SHOW_EMERGENCY_ALERT_ONOFF_BOOL, false);
         sDefaults.putBoolean(KEY_DISABLE_SEVERE_WHEN_EXTREME_DISABLED_BOOL, true);
+        sDefaults.putLong(KEY_MESSAGE_EXPIRATION_TIME_LONG, 86400000L);
         sDefaults.putStringArray(KEY_CARRIER_DATA_CALL_RETRY_CONFIG_STRINGS, new String[]{
                 "default:default_randomization=2000,5000,10000,20000,40000,80000:5000,160000:5000,"
                         + "320000:5000,640000:5000,1280000:5000,1800000:5000",