diff --git a/src/com/android/server/telecom/Call.java b/src/com/android/server/telecom/Call.java
index ed6a20a..9a36d3e 100644
--- a/src/com/android/server/telecom/Call.java
+++ b/src/com/android/server/telecom/Call.java
@@ -2555,6 +2555,15 @@
         }
     }
 
+    public void addConferenceParticipants(List<Uri> participants) {
+        if (mConnectionService == null) {
+            Log.w(this, "adding conference participants without a connection service.");
+        } else if (can(Connection.CAPABILITY_ADD_PARTICIPANT)) {
+            Log.addEvent(this, LogUtils.Events.ADD_PARTICIPANT);
+            mConnectionService.addConferenceParticipants(this, participants);
+        }
+    }
+
     /**
      * Initiates a request to the connection service to pull this call.
      * <p>
diff --git a/src/com/android/server/telecom/ConnectionServiceWrapper.java b/src/com/android/server/telecom/ConnectionServiceWrapper.java
index 248374d..b089db6 100644
--- a/src/com/android/server/telecom/ConnectionServiceWrapper.java
+++ b/src/com/android/server/telecom/ConnectionServiceWrapper.java
@@ -1680,6 +1680,18 @@
         }
     }
 
+    void addConferenceParticipants(Call call, List<Uri> participants) {
+        final String callId = mCallIdMapper.getCallId(call);
+        if (callId != null && isServiceValid("addConferenceParticipants")) {
+            try {
+                logOutgoing("addConferenceParticipants %s", callId);
+                mServiceInterface.addConferenceParticipants(callId, participants,
+                        Log.getExternalSession());
+            } catch (RemoteException ignored) {
+            }
+        }
+    }
+
     @VisibleForTesting
     public void pullExternalCall(Call call) {
         final String callId = mCallIdMapper.getCallId(call);
diff --git a/src/com/android/server/telecom/InCallAdapter.java b/src/com/android/server/telecom/InCallAdapter.java
index 3e2fa12..f47f212 100644
--- a/src/com/android/server/telecom/InCallAdapter.java
+++ b/src/com/android/server/telecom/InCallAdapter.java
@@ -474,6 +474,29 @@
     }
 
     @Override
+    public void addConferenceParticipants(String callId, List<Uri> participants) {
+        try {
+            Log.startSession("ICA.aCP", mOwnerPackageName);
+            long token = Binder.clearCallingIdentity();
+            try {
+                synchronized (mLock) {
+                    Call call = mCallIdMapper.getCall(callId);
+                    if (call != null) {
+                        call.addConferenceParticipants(participants);
+                    } else {
+                        Log.w(this, "addConferenceParticipants, unknown call id: %s", callId);
+                    }
+                }
+            } finally {
+                Binder.restoreCallingIdentity(token);
+            }
+        } finally {
+            Log.endSession();
+        }
+    }
+
+
+    @Override
     public void pullExternalCall(String callId) {
         try {
             Log.startSession("ICA.pEC", mOwnerPackageName);
diff --git a/src/com/android/server/telecom/LogUtils.java b/src/com/android/server/telecom/LogUtils.java
index f586a9d..0b7a1b5 100644
--- a/src/com/android/server/telecom/LogUtils.java
+++ b/src/com/android/server/telecom/LogUtils.java
@@ -127,6 +127,7 @@
         public static final String CONFERENCE_WITH = "CONF_WITH";
         public static final String SPLIT_FROM_CONFERENCE = "CONF_SPLIT";
         public static final String SWAP = "SWAP";
+        public static final String ADD_PARTICIPANT = "ADD_PARTICIPANT";
         public static final String ADD_CHILD = "ADD_CHILD";
         public static final String REMOVE_CHILD = "REMOVE_CHILD";
         public static final String SET_PARENT = "SET_PARENT";
diff --git a/src/com/android/server/telecom/ParcelableCallUtils.java b/src/com/android/server/telecom/ParcelableCallUtils.java
index d1d8f0d..9f90874 100644
--- a/src/com/android/server/telecom/ParcelableCallUtils.java
+++ b/src/com/android/server/telecom/ParcelableCallUtils.java
@@ -514,7 +514,9 @@
         android.telecom.Call.Details.CAPABILITY_CAN_PULL_CALL,
 
         Connection.CAPABILITY_SUPPORT_DEFLECT,
-        android.telecom.Call.Details.CAPABILITY_SUPPORT_DEFLECT
+        android.telecom.Call.Details.CAPABILITY_SUPPORT_DEFLECT,
+        Connection.CAPABILITY_ADD_PARTICIPANT,
+        android.telecom.Call.Details.CAPABILITY_ADD_PARTICIPANT
     };
 
     private static int convertConnectionToCallCapabilities(int connectionCapabilities) {
diff --git a/tests/src/com/android/server/telecom/tests/ConnectionServiceFixture.java b/tests/src/com/android/server/telecom/tests/ConnectionServiceFixture.java
index 315b074..fb04577 100644
--- a/tests/src/com/android/server/telecom/tests/ConnectionServiceFixture.java
+++ b/tests/src/com/android/server/telecom/tests/ConnectionServiceFixture.java
@@ -359,6 +359,12 @@
                 Session.Info info) throws RemoteException { }
 
         @Override
+        public void addConferenceParticipants(String CallId, List<Uri> participants,
+                Session.Info sessionInfo) throws RemoteException {
+
+        }
+
+        @Override
         public void onPostDialContinue(String callId, boolean proceed,
                 Session.Info info) throws RemoteException { }