diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 086f4b4b4c..8f1f3e1dd8 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -6,6 +6,8 @@
     *   Add `Format.channelMask` to explicitly represent the audio channel mask,
         and a new `Util.getAudioTrackChannelConfig(Format)` overload to safely
         resolve it.
+    *   Fix handling of `onAudioSessionIdChanged` in `SimpleBasePlayer` and
+        `ForwardingSimpleBasePlayer`.
 *   ExoPlayer:
     *   Mark tracks with a well-formed but unrecognized codec profile or level
         as `supported=NO_EXCEEDS_CAPABILITIES` instead of `supported=YES` (which
diff --git a/libraries/common/src/main/java/androidx/media3/common/ForwardingSimpleBasePlayer.java b/libraries/common/src/main/java/androidx/media3/common/ForwardingSimpleBasePlayer.java
index f1e53879dc..830846fcb6 100644
--- a/libraries/common/src/main/java/androidx/media3/common/ForwardingSimpleBasePlayer.java
+++ b/libraries/common/src/main/java/androidx/media3/common/ForwardingSimpleBasePlayer.java
@@ -123,6 +123,7 @@ protected State getState() {
     if (player.isCommandAvailable(Player.COMMAND_GET_AUDIO_ATTRIBUTES)) {
       state.setAudioAttributes(player.getAudioAttributes());
     }
+    state.setAudioSessionId(player.getAudioSessionId());
     state.setAvailableCommands(player.getAvailableCommands());
     if (player.isCommandAvailable(Player.COMMAND_GET_CURRENT_MEDIA_ITEM)) {
       state.setContentBufferedPositionMs(positionSuppliers.contentBufferedPositionSupplier);
diff --git a/libraries/common/src/main/java/androidx/media3/common/SimpleBasePlayer.java b/libraries/common/src/main/java/androidx/media3/common/SimpleBasePlayer.java
index 29e01e3618..08f7a5a235 100644
--- a/libraries/common/src/main/java/androidx/media3/common/SimpleBasePlayer.java
+++ b/libraries/common/src/main/java/androidx/media3/common/SimpleBasePlayer.java
@@ -3840,6 +3840,11 @@ private void updateStateAndInformListeners(
           Player.EVENT_AUDIO_ATTRIBUTES_CHANGED,
           listener -> listener.onAudioAttributesChanged(newState.audioAttributes));
     }
+    if (previousState.audioSessionId != newState.audioSessionId) {
+      listeners.queueEvent(
+          Player.EVENT_AUDIO_SESSION_ID,
+          listener -> listener.onAudioSessionIdChanged(newState.audioSessionId));
+    }
     if (!previousState.videoSize.equals(newState.videoSize)) {
       listeners.queueEvent(
           Player.EVENT_VIDEO_SIZE_CHANGED,
diff --git a/libraries/common/src/test/java/androidx/media3/common/ForwardingSimpleBasePlayerTest.java b/libraries/common/src/test/java/androidx/media3/common/ForwardingSimpleBasePlayerTest.java
index 21a4f90f56..062e660ac4 100644
--- a/libraries/common/src/test/java/androidx/media3/common/ForwardingSimpleBasePlayerTest.java
+++ b/libraries/common/src/test/java/androidx/media3/common/ForwardingSimpleBasePlayerTest.java
@@ -171,6 +171,7 @@ public void getterMethods_noOtherMethodCalls_returnCurrentStateFromWrappedPlayer
             .setPlaybackParameters(playbackParameters)
             .setTrackSelectionParameters(trackSelectionParameters)
             .setAudioAttributes(audioAttributes)
+            .setAudioSessionId(1234)
             .setVolume(0.5f)
             .setVideoSize(videoSize)
             .setCurrentCues(cueGroup)
@@ -225,6 +226,7 @@ protected State getState() {
     assertThat(forwardingPlayer.getContentPosition()).isEqualTo(456);
     assertThat(forwardingPlayer.getContentBufferedPosition()).isEqualTo(499);
     assertThat(forwardingPlayer.getAudioAttributes()).isEqualTo(audioAttributes);
+    assertThat(forwardingPlayer.getAudioSessionId()).isEqualTo(1234);
     assertThat(forwardingPlayer.getVolume()).isEqualTo(0.5f);
     assertThat(forwardingPlayer.getVideoSize()).isEqualTo(videoSize);
     assertThat(forwardingPlayer.getCurrentCues()).isEqualTo(cueGroup);
diff --git a/libraries/common/src/test/java/androidx/media3/common/SimpleBasePlayerTest.java b/libraries/common/src/test/java/androidx/media3/common/SimpleBasePlayerTest.java
index 13b8db7f09..dff14a4a88 100644
--- a/libraries/common/src/test/java/androidx/media3/common/SimpleBasePlayerTest.java
+++ b/libraries/common/src/test/java/androidx/media3/common/SimpleBasePlayerTest.java
@@ -1439,6 +1439,7 @@ public void invalidateState_updatesStateAndInformsListeners() throws Exception {
             .setPlaybackParameters(PlaybackParameters.DEFAULT)
             .setTrackSelectionParameters(TrackSelectionParameters.DEFAULT)
             .setAudioAttributes(AudioAttributes.DEFAULT)
+            .setAudioSessionId(1234)
             .setVolume(1f)
             .setVideoSize(VideoSize.UNKNOWN)
             .setCurrentCues(CueGroup.EMPTY_TIME_ZERO)
@@ -1509,6 +1510,7 @@ public void invalidateState_updatesStateAndInformsListeners() throws Exception {
             .setPlaybackParameters(playbackParameters)
             .setTrackSelectionParameters(trackSelectionParameters)
             .setAudioAttributes(audioAttributes)
+            .setAudioSessionId(5678)
             .setVolume(0.5f)
             .setVideoSize(videoSize)
             .setCurrentCues(cueGroup)
@@ -1569,6 +1571,7 @@ protected State getState() {
     verify(listener).onPlaybackParametersChanged(playbackParameters);
     verify(listener).onTrackSelectionParametersChanged(trackSelectionParameters);
     verify(listener).onAudioAttributesChanged(audioAttributes);
+    verify(listener).onAudioSessionIdChanged(5678);
     verify(listener).onVolumeChanged(0.5f);
     verify(listener).onVideoSizeChanged(videoSize);
     verify(listener).onCues(cueGroup.cues);
@@ -1635,6 +1638,7 @@ protected State getState() {
                         Player.EVENT_MAX_SEEK_TO_PREVIOUS_POSITION_CHANGED,
                         Player.EVENT_TRACK_SELECTION_PARAMETERS_CHANGED,
                         Player.EVENT_AUDIO_ATTRIBUTES_CHANGED,
+                        Player.EVENT_AUDIO_SESSION_ID,
                         Player.EVENT_VOLUME_CHANGED,
                         Player.EVENT_SURFACE_SIZE_CHANGED,
                         Player.EVENT_VIDEO_SIZE_CHANGED,