diff --git a/api/current.txt b/api/current.txt
index 53791405683cc..c6316271c6365 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -36768,6 +36768,7 @@ package android.telephony {
     field public static final java.lang.String ACTION_CARRIER_CONFIG_CHANGED = "android.telephony.action.CARRIER_CONFIG_CHANGED";
     field public static final java.lang.String KEY_ADDITIONAL_CALL_SETTING_BOOL = "additional_call_setting_bool";
     field public static final java.lang.String KEY_ALLOW_ADDING_APNS_BOOL = "allow_adding_apns_bool";
+    field public static final java.lang.String KEY_ALLOW_ADD_CALL_DURING_VIDEO_CALL_BOOL = "allow_add_call_during_video_call";
     field public static final java.lang.String KEY_ALLOW_EMERGENCY_NUMBERS_IN_CALL_LOG_BOOL = "allow_emergency_numbers_in_call_log_bool";
     field public static final java.lang.String KEY_ALLOW_EMERGENCY_VIDEO_CALLS_BOOL = "allow_emergency_video_calls_bool";
     field public static final java.lang.String KEY_ALLOW_LOCAL_DTMF_TONES_BOOL = "allow_local_dtmf_tones_bool";
diff --git a/api/system-current.txt b/api/system-current.txt
index 6a6653357d10b..3fa518a43e49f 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -39807,6 +39807,7 @@ package android.telephony {
     field public static final java.lang.String ACTION_CARRIER_CONFIG_CHANGED = "android.telephony.action.CARRIER_CONFIG_CHANGED";
     field public static final java.lang.String KEY_ADDITIONAL_CALL_SETTING_BOOL = "additional_call_setting_bool";
     field public static final java.lang.String KEY_ALLOW_ADDING_APNS_BOOL = "allow_adding_apns_bool";
+    field public static final java.lang.String KEY_ALLOW_ADD_CALL_DURING_VIDEO_CALL_BOOL = "allow_add_call_during_video_call";
     field public static final java.lang.String KEY_ALLOW_EMERGENCY_NUMBERS_IN_CALL_LOG_BOOL = "allow_emergency_numbers_in_call_log_bool";
     field public static final java.lang.String KEY_ALLOW_EMERGENCY_VIDEO_CALLS_BOOL = "allow_emergency_video_calls_bool";
     field public static final java.lang.String KEY_ALLOW_LOCAL_DTMF_TONES_BOOL = "allow_local_dtmf_tones_bool";
diff --git a/api/test-current.txt b/api/test-current.txt
index 7642282f4aca2..993f388f15abb 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -36846,6 +36846,7 @@ package android.telephony {
     field public static final java.lang.String ACTION_CARRIER_CONFIG_CHANGED = "android.telephony.action.CARRIER_CONFIG_CHANGED";
     field public static final java.lang.String KEY_ADDITIONAL_CALL_SETTING_BOOL = "additional_call_setting_bool";
     field public static final java.lang.String KEY_ALLOW_ADDING_APNS_BOOL = "allow_adding_apns_bool";
+    field public static final java.lang.String KEY_ALLOW_ADD_CALL_DURING_VIDEO_CALL_BOOL = "allow_add_call_during_video_call";
     field public static final java.lang.String KEY_ALLOW_EMERGENCY_NUMBERS_IN_CALL_LOG_BOOL = "allow_emergency_numbers_in_call_log_bool";
     field public static final java.lang.String KEY_ALLOW_EMERGENCY_VIDEO_CALLS_BOOL = "allow_emergency_video_calls_bool";
     field public static final java.lang.String KEY_ALLOW_LOCAL_DTMF_TONES_BOOL = "allow_local_dtmf_tones_bool";
diff --git a/telecomm/java/android/telecom/Connection.java b/telecomm/java/android/telecom/Connection.java
index 2a0a9a640c6d7..1b14d65b823ca 100644
--- a/telecomm/java/android/telecom/Connection.java
+++ b/telecomm/java/android/telecom/Connection.java
@@ -374,6 +374,14 @@ public abstract class Connection extends Conferenceable {
     public static final String EXTRA_ANSWERING_DROPS_FG_CALL =
             "android.telecom.extra.ANSWERING_DROPS_FG_CALL";
 
+    /**
+     * Boolean connection extra key on a {@link Connection} which indicates that adding an
+     * additional call is disallowed when there is a video call in progress.
+     * @hide
+     */
+    public static final String EXTRA_DISABLE_ADD_CALL_DURING_VIDEO_CALL =
+            "android.telecom.extra.DISABLE_ADD_CALL_DURING_VIDEO_CALL";
+
     /**
      * Connection event used to inform Telecom that it should play the on hold tone.  This is used
      * to play a tone when the peer puts the current call on hold.  Sent to Telecom via
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 8399bb669da00..a5e50aa1ee5db 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -818,6 +818,12 @@ public class CarrierConfigManager {
     public static final String KEY_ALLOW_MERGE_WIFI_CALLS_WHEN_VOWIFI_OFF_BOOL =
             "allow_merge_wifi_calls_when_vowifi_off_bool";
 
+    /**
+     * When true, indicates that adding a call is disabled when there is an ongoing video call.
+     */
+    public static final String KEY_ALLOW_ADD_CALL_DURING_VIDEO_CALL_BOOL =
+            "allow_add_call_during_video_call";
+
     /** The default value for every variable. */
     private final static PersistableBundle sDefaults;
 
@@ -972,6 +978,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_TREAT_DOWNGRADED_VIDEO_CALLS_AS_VIDEO_CALLS_BOOL, false);
         sDefaults.putBoolean(KEY_DROP_VIDEO_CALL_WHEN_ANSWERING_AUDIO_CALL_BOOL, false);
         sDefaults.putBoolean(KEY_ALLOW_MERGE_WIFI_CALLS_WHEN_VOWIFI_OFF_BOOL, true);
+        sDefaults.putBoolean(KEY_ALLOW_ADD_CALL_DURING_VIDEO_CALL_BOOL, true);
     }
 
     /**