diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index e976c48f4fce7..dea8314c2467a 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -15912,6 +15912,7 @@ package android.telephony.ims.stub {
   public class ImsSmsImplBase {
     ctor public ImsSmsImplBase();
     method public void acknowledgeSms(int, @IntRange(from=0, to=65535) int, int);
+    method public void acknowledgeSms(int, @IntRange(from=0, to=65535) int, int, @NonNull byte[]);
     method public void acknowledgeSmsReport(int, @IntRange(from=0, to=65535) int, int);
     method public String getSmsFormat();
     method public void onReady();
diff --git a/telephony/java/android/telephony/ims/aidl/IImsMmTelFeature.aidl b/telephony/java/android/telephony/ims/aidl/IImsMmTelFeature.aidl
index 85191734872ad..ea4480dc7958b 100644
--- a/telephony/java/android/telephony/ims/aidl/IImsMmTelFeature.aidl
+++ b/telephony/java/android/telephony/ims/aidl/IImsMmTelFeature.aidl
@@ -65,6 +65,7 @@ interface IImsMmTelFeature {
     oneway void sendSms(in int token, int messageRef, String format, String smsc, boolean retry,
             in byte[] pdu);
     oneway void acknowledgeSms(int token, int messageRef, int result);
+    oneway void acknowledgeSmsWithPdu(int token, int messageRef, int result, in byte[] pdu);
     oneway void acknowledgeSmsReport(int token, int messageRef, int result);
     String getSmsFormat();
     oneway void onSmsReady();
diff --git a/telephony/java/android/telephony/ims/feature/MmTelFeature.java b/telephony/java/android/telephony/ims/feature/MmTelFeature.java
index 8147759769e60..d776928965e57 100644
--- a/telephony/java/android/telephony/ims/feature/MmTelFeature.java
+++ b/telephony/java/android/telephony/ims/feature/MmTelFeature.java
@@ -274,6 +274,12 @@ public class MmTelFeature extends ImsFeature {
                     .acknowledgeSms(token, messageRef, result), "acknowledgeSms");
         }
 
+        @Override
+        public void acknowledgeSmsWithPdu(int token, int messageRef, int result, byte[] pdu) {
+            executeMethodAsyncNoException(() -> MmTelFeature.this
+                    .acknowledgeSms(token, messageRef, result, pdu), "acknowledgeSms");
+        }
+
         @Override
         public void acknowledgeSmsReport(int token, int messageRef, int result) {
             executeMethodAsyncNoException(() -> MmTelFeature.this
@@ -1087,6 +1093,11 @@ public class MmTelFeature extends ImsFeature {
         getSmsImplementation().acknowledgeSms(token, messageRef, result);
     }
 
+    private void acknowledgeSms(int token, int messageRef,
+            @ImsSmsImplBase.DeliverStatusResult int result, byte[] pdu) {
+        getSmsImplementation().acknowledgeSms(token, messageRef, result, pdu);
+    }
+
     private void acknowledgeSmsReport(int token, int messageRef,
             @ImsSmsImplBase.StatusReportResult int result) {
         getSmsImplementation().acknowledgeSmsReport(token, messageRef, result);
diff --git a/telephony/java/android/telephony/ims/stub/ImsSmsImplBase.java b/telephony/java/android/telephony/ims/stub/ImsSmsImplBase.java
index fb997d1184197..66833d18a945e 100644
--- a/telephony/java/android/telephony/ims/stub/ImsSmsImplBase.java
+++ b/telephony/java/android/telephony/ims/stub/ImsSmsImplBase.java
@@ -18,6 +18,7 @@ package android.telephony.ims.stub;
 
 import android.annotation.IntDef;
 import android.annotation.IntRange;
+import android.annotation.NonNull;
 import android.annotation.SystemApi;
 import android.os.RemoteException;
 import android.telephony.SmsManager;
@@ -174,6 +175,9 @@ public class ImsSmsImplBase {
      * {@link #onSmsReceived(int, String, byte[])} has been called to deliver the result to the IMS
      * provider.
      *
+     * If the framework needs to provide the PDU used to acknowledge the SMS,
+     * {@link #acknowledgeSms(int, int, int, byte[])} will be called.
+     *
      * @param token token provided in {@link #onSmsReceived(int, String, byte[])}
      * @param messageRef the message reference, which may be 1 byte if it is in
      *     {@link SmsMessage#FORMAT_3GPP} format (see TS.123.040) or 2 bytes if it is in
@@ -185,6 +189,27 @@ public class ImsSmsImplBase {
         Log.e(LOG_TAG, "acknowledgeSms() not implemented.");
     }
 
+    /**
+     * This method will be called by the platform after
+     * {@link #onSmsReceived(int, String, byte[])} has been called to acknowledge an incoming SMS.
+     *
+     * This method is only called in cases where the framework needs to provide the PDU such as the
+     * case where we provide the Short Message Transfer Layer PDU (see 3GPP TS 23.040). Otherwise,
+     * {@link #acknowledgeSms(int, int, int)} will be used.
+     *
+     * @param token token provided in {@link #onSmsReceived(int, String, byte[])}
+     * @param messageRef the message reference, which may be 1 byte if it is in
+     *     {@link SmsMessage#FORMAT_3GPP} format (see TS.123.040) or 2 bytes if it is in
+     *     {@link SmsMessage#FORMAT_3GPP2} format (see 3GPP2 C.S0015-B).
+     * @param result result of delivering the message.
+     * @param pdu PDU representing the contents of the message.
+     */
+    public void acknowledgeSms(int token, @IntRange(from = 0, to = 65535)  int messageRef,
+            @DeliverStatusResult int result, @NonNull byte[] pdu) {
+        Log.e(LOG_TAG, "acknowledgeSms() not implemented. acknowledgeSms(int, int, int) called.");
+        acknowledgeSms(token, messageRef, result);
+    }
+
     /**
      * This method will be triggered by the platform after
      * {@link #onSmsStatusReportReceived(int, int, String, byte[])} or