diff --git a/api/current.txt b/api/current.txt
index fa232ac..ff37010 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -45437,7 +45437,6 @@
     field public static final int PROPERTY_GENERIC_CONFERENCE = 2; // 0x2
     field public static final int PROPERTY_HAS_CDMA_VOICE_PRIVACY = 128; // 0x80
     field public static final int PROPERTY_HIGH_DEF_AUDIO = 16; // 0x10
-    field public static final int PROPERTY_IS_ADHOC_CONFERENCE = 8192; // 0x2000
     field public static final int PROPERTY_IS_EXTERNAL_CALL = 64; // 0x40
     field public static final int PROPERTY_NETWORK_IDENTIFIED_EMERGENCY_CALL = 2048; // 0x800
     field public static final int PROPERTY_RTT = 1024; // 0x400
@@ -45515,7 +45514,6 @@
   public abstract class Conference extends android.telecom.Conferenceable {
     ctor public Conference(android.telecom.PhoneAccountHandle);
     method public final boolean addConnection(android.telecom.Connection);
-    method @NonNull public static android.telecom.Conference createFailedConference(@NonNull android.telecom.DisconnectCause, @NonNull android.telecom.PhoneAccountHandle);
     method public final void destroy();
     method public final android.telecom.CallAudioState getCallAudioState();
     method public final java.util.List<android.telecom.Connection> getConferenceableConnections();
@@ -45530,8 +45528,6 @@
     method public final android.telecom.StatusHints getStatusHints();
     method public android.telecom.Connection.VideoProvider getVideoProvider();
     method public int getVideoState();
-    method public final boolean isRingbackRequested();
-    method public void onAnswer(int);
     method public void onCallAudioStateChanged(android.telecom.CallAudioState);
     method public void onConnectionAdded(android.telecom.Connection);
     method public void onDisconnect();
@@ -45540,7 +45536,6 @@
     method public void onMerge(android.telecom.Connection);
     method public void onMerge();
     method public void onPlayDtmfTone(char);
-    method public void onReject();
     method public void onSeparate(android.telecom.Connection);
     method public void onStopDtmfTone();
     method public void onSwap();
@@ -45560,8 +45555,6 @@
     method public final void setDisconnected(android.telecom.DisconnectCause);
     method public final void setExtras(@Nullable android.os.Bundle);
     method public final void setOnHold();
-    method public final void setRingbackRequested(boolean);
-    method public final void setRinging();
     method public final void setStatusHints(android.telecom.StatusHints);
     method public final void setVideoProvider(android.telecom.Connection, android.telecom.Connection.VideoProvider);
     method public final void setVideoState(android.telecom.Connection, int);
@@ -45720,7 +45713,6 @@
     field public static final int PROPERTY_ASSISTED_DIALING_USED = 512; // 0x200
     field public static final int PROPERTY_HAS_CDMA_VOICE_PRIVACY = 32; // 0x20
     field public static final int PROPERTY_HIGH_DEF_AUDIO = 4; // 0x4
-    field public static final int PROPERTY_IS_ADHOC_CONFERENCE = 4096; // 0x1000
     field public static final int PROPERTY_IS_EXTERNAL_CALL = 16; // 0x10
     field public static final int PROPERTY_IS_RTT = 256; // 0x100
     field public static final int PROPERTY_NETWORK_IDENTIFIED_EMERGENCY_CALL = 1024; // 0x400
@@ -46136,7 +46128,6 @@
     method @Deprecated @RequiresPermission(anyOf={android.Manifest.permission.ANSWER_PHONE_CALLS, android.Manifest.permission.MODIFY_PHONE_STATE}) public void acceptRingingCall();
     method @Deprecated @RequiresPermission(anyOf={android.Manifest.permission.ANSWER_PHONE_CALLS, android.Manifest.permission.MODIFY_PHONE_STATE}) public void acceptRingingCall(int);
     method public void addNewIncomingCall(android.telecom.PhoneAccountHandle, android.os.Bundle);
-    method public void addNewIncomingConference(@NonNull android.telecom.PhoneAccountHandle, @NonNull android.os.Bundle);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void cancelMissedCallsNotification();
     method public android.content.Intent createManageBlockedNumbersIntent();
     method @Deprecated @RequiresPermission(android.Manifest.permission.ANSWER_PHONE_CALLS) public boolean endCall();
@@ -46164,7 +46155,6 @@
     method public void registerPhoneAccount(android.telecom.PhoneAccount);
     method @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE) public void showInCallScreen(boolean);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void silenceRinger();
-    method @RequiresPermission(android.Manifest.permission.CALL_PHONE) public void startConference(@NonNull java.util.List<android.net.Uri>, @NonNull android.os.Bundle);
     method public void unregisterPhoneAccount(android.telecom.PhoneAccountHandle);
     field public static final String ACTION_CHANGE_DEFAULT_DIALER = "android.telecom.action.CHANGE_DEFAULT_DIALER";
     field public static final String ACTION_CHANGE_PHONE_ACCOUNTS = "android.telecom.action.CHANGE_PHONE_ACCOUNTS";
@@ -46691,7 +46681,6 @@
     field public static final String KEY_SIM_NETWORK_UNLOCK_ALLOW_DISMISS_BOOL = "sim_network_unlock_allow_dismiss_bool";
     field public static final String KEY_SMS_REQUIRES_DESTINATION_NUMBER_CONVERSION_BOOL = "sms_requires_destination_number_conversion_bool";
     field public static final String KEY_SUPPORT_3GPP_CALL_FORWARDING_WHILE_ROAMING_BOOL = "support_3gpp_call_forwarding_while_roaming_bool";
-    field public static final String KEY_SUPPORT_ADHOC_CONFERENCE_CALLS_BOOL = "support_adhoc_conference_calls_bool";
     field public static final String KEY_SUPPORT_CLIR_NETWORK_DEFAULT_BOOL = "support_clir_network_default_bool";
     field public static final String KEY_SUPPORT_CONFERENCE_CALL_BOOL = "support_conference_call_bool";
     field public static final String KEY_SUPPORT_EMERGENCY_SMS_OVER_IMS_BOOL = "support_emergency_sms_over_ims_bool";
diff --git a/telecomm/java/android/telecom/Call.java b/telecomm/java/android/telecom/Call.java
index f54f8d1..ec99f36 100644
--- a/telecomm/java/android/telecom/Call.java
+++ b/telecomm/java/android/telecom/Call.java
@@ -573,6 +573,7 @@
         /**
          * Indicates that the call is an adhoc conference call. This property can be set for both
          * incoming and outgoing calls.
+         * @hide
          */
         public static final int PROPERTY_IS_ADHOC_CONFERENCE = 0x00002000;
 
diff --git a/telecomm/java/android/telecom/Conference.java b/telecomm/java/android/telecom/Conference.java
index 6b0845f..56acdff 100644
--- a/telecomm/java/android/telecom/Conference.java
+++ b/telecomm/java/android/telecom/Conference.java
@@ -174,6 +174,7 @@
     /**
      * Returns whether this conference is requesting that the system play a ringback tone
      * on its behalf.
+     * @hide
      */
     public final boolean isRingbackRequested() {
         return mRingbackRequested;
@@ -324,6 +325,7 @@
      * the default dialer's {@link InCallService}.
      *
      * @param videoState The video state in which to answer the connection.
+     * @hide
      */
     public void onAnswer(int videoState) {}
 
@@ -343,6 +345,7 @@
      * a request to reject.
      * For managed {@link ConnectionService}s, this will be called when the user rejects a call via
      * the default dialer's {@link InCallService}.
+     * @hide
      */
     public void onReject() {}
 
@@ -362,6 +365,7 @@
 
     /**
      * Sets state to be ringing.
+     * @hide
      */
     public final void setRinging() {
         setState(Connection.STATE_RINGING);
@@ -487,6 +491,7 @@
      * that do not play a ringback tone themselves in the conference's audio stream.
      *
      * @param ringback Whether the ringback tone is to be played.
+     * @hide
      */
     public final void setRingbackRequested(boolean ringback) {
         if (mRingbackRequested != ringback) {
@@ -736,6 +741,7 @@
      *
      * @param disconnectCause The disconnect cause, ({@see android.telecomm.DisconnectCause}).
      * @return A {@code Conference} which indicates failure.
+     * @hide
      */
     public @NonNull static Conference createFailedConference(
             @NonNull DisconnectCause disconnectCause, @NonNull PhoneAccountHandle phoneAccount) {
diff --git a/telecomm/java/android/telecom/Connection.java b/telecomm/java/android/telecom/Connection.java
index 72c66d2..8049459 100644
--- a/telecomm/java/android/telecom/Connection.java
+++ b/telecomm/java/android/telecom/Connection.java
@@ -501,7 +501,7 @@
      * Set by the framework to indicate that it is an adhoc conference call.
      * <p>
      * This is used for Outgoing and incoming conference calls.
-     *
+     * @hide
      */
     public static final int PROPERTY_IS_ADHOC_CONFERENCE = 1 << 12;
 
diff --git a/telecomm/java/android/telecom/TelecomManager.java b/telecomm/java/android/telecom/TelecomManager.java
index bf4dee2..a28cc4f 100644
--- a/telecomm/java/android/telecom/TelecomManager.java
+++ b/telecomm/java/android/telecom/TelecomManager.java
@@ -1875,8 +1875,8 @@
      *            {@link #registerPhoneAccount}.
      * @param extras A bundle that will be passed through to
      *            {@link ConnectionService#onCreateIncomingConference}.
+     * @hide
      */
-
     public void addNewIncomingConference(@NonNull PhoneAccountHandle phoneAccount,
             @NonNull Bundle extras) {
         try {
@@ -2115,6 +2115,7 @@
      *
      * @param participants List of participants to start conference with
      * @param extras Bundle of extras to use with the call
+     * @hide
      */
     @RequiresPermission(android.Manifest.permission.CALL_PHONE)
     public void startConference(@NonNull List<Uri> participants,
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 945c888..ebb53c5 100755
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -1084,6 +1084,7 @@
     /**
      * Determines whether adhoc conference calls are supported by a carrier.  When {@code true},
      * adhoc conference calling is supported, {@code false otherwise}.
+     * @hide
      */
     public static final String KEY_SUPPORT_ADHOC_CONFERENCE_CALLS_BOOL =
             "support_adhoc_conference_calls_bool";