diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 7c11cfe8dabbb..29f8eb40ba24c 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -892,6 +892,61 @@ public class TelephonyManager {
     public static final String EVENT_CALL_FORWARDED =
             "android.telephony.event.EVENT_CALL_FORWARDED";
 
+    /**
+     * {@link android.telecom.Connection} event used to indicate that a supplementary service
+     * notification has been received.
+     * <p>
+     * Sent via {@link android.telecom.Connection#sendConnectionEvent(String, Bundle)}.
+     * The {@link Bundle} parameter is expected to include the following extras:
+     * <ul>
+     *     <li>{@link #EXTRA_NOTIFICATION_TYPE} - the notification type.</li>
+     *     <li>{@link #EXTRA_NOTIFICATION_CODE} - the notification code.</li>
+     *     <li>{@link #EXTRA_NOTIFICATION_MESSAGE} - human-readable message associated with the
+     *     supplementary service notification.</li>
+     * </ul>
+     * @hide
+     */
+    public static final String EVENT_SUPPLEMENTARY_SERVICE_NOTIFICATION =
+            "android.telephony.event.EVENT_SUPPLEMENTARY_SERVICE_NOTIFICATION";
+
+    /**
+     * Integer extra key used with {@link #EVENT_SUPPLEMENTARY_SERVICE_NOTIFICATION} which indicates
+     * the type of supplementary service notification which occurred.
+     * Will be either
+     * {@link com.android.internal.telephony.gsm.SuppServiceNotification#NOTIFICATION_TYPE_CODE_1}
+     * or
+     * {@link com.android.internal.telephony.gsm.SuppServiceNotification#NOTIFICATION_TYPE_CODE_2}
+     * <p>
+     * Set in the extras for the {@link #EVENT_SUPPLEMENTARY_SERVICE_NOTIFICATION} connection event.
+     * @hide
+     */
+    public static final String EXTRA_NOTIFICATION_TYPE =
+            "android.telephony.extra.NOTIFICATION_TYPE";
+
+    /**
+     * Integer extra key used with {@link #EVENT_SUPPLEMENTARY_SERVICE_NOTIFICATION} which indicates
+     * the supplementary service notification which occurred.
+     * <p>
+     * Depending on the {@link #EXTRA_NOTIFICATION_TYPE}, the code will be one of the {@code CODE_*}
+     * codes defined in {@link com.android.internal.telephony.gsm.SuppServiceNotification}.
+     * <p>
+     * Set in the extras for the {@link #EVENT_SUPPLEMENTARY_SERVICE_NOTIFICATION} connection event.
+     * @hide
+     */
+    public static final String EXTRA_NOTIFICATION_CODE =
+            "android.telephony.extra.NOTIFICATION_CODE";
+
+    /**
+     * {@link CharSequence} extra key used with {@link #EVENT_SUPPLEMENTARY_SERVICE_NOTIFICATION}
+     * which contains a human-readable message which can be displayed to the user for the
+     * supplementary service notification.
+     * <p>
+     * Set in the extras for the {@link #EVENT_SUPPLEMENTARY_SERVICE_NOTIFICATION} connection event.
+     * @hide
+     */
+    public static final String EXTRA_NOTIFICATION_MESSAGE =
+            "android.telephony.extra.NOTIFICATION_MESSAGE";
+
     /* Visual voicemail protocols */
 
     /**