diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 806934a0d7afa..288411a8186cb 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -396,6 +396,15 @@ public class CarrierConfigManager {
      */
     public static final String KEY_DEFAULT_VM_NUMBER_STRING = "default_vm_number_string";
 
+    /**
+     * Where there is no preloaded voicemail number on a SIM card, specifies the carrier's default
+     * voicemail number for roaming network.
+     * When empty string, no default voicemail number is specified for roaming network.
+     * @hide
+     */
+    public static final String KEY_DEFAULT_VM_NUMBER_ROAMING_STRING =
+            "default_vm_number_roaming_string";
+
     /**
      * Flag that specifies to use the user's own phone number as the voicemail number when there is
      * no pre-loaded voicemail number on the SIM card.
@@ -1931,6 +1940,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_NOTIFY_HANDOVER_VIDEO_FROM_LTE_TO_WIFI_BOOL, false);
         sDefaults.putBoolean(KEY_SUPPORT_DOWNGRADE_VT_TO_AUDIO_BOOL, true);
         sDefaults.putString(KEY_DEFAULT_VM_NUMBER_STRING, "");
+        sDefaults.putString(KEY_DEFAULT_VM_NUMBER_ROAMING_STRING, "");
         sDefaults.putBoolean(KEY_CONFIG_TELEPHONY_USE_OWN_NUMBER_FOR_VOICEMAIL_BOOL, false);
         sDefaults.putBoolean(KEY_IGNORE_DATA_ENABLED_CHANGED_FOR_VIDEO_CALLS, true);
         sDefaults.putBoolean(KEY_VILTE_DATA_IS_METERED_BOOL, true);