diff --git a/audio/aidl/default/Module.cpp b/audio/aidl/default/Module.cpp
index 10aead2..5440b8d 100644
--- a/audio/aidl/default/Module.cpp
+++ b/audio/aidl/default/Module.cpp
@@ -895,6 +895,21 @@
         out_suggested->gain = in_requested.gain.value();
     }
 
+    if (in_requested.ext.getTag() != AudioPortExt::Tag::unspecified) {
+        if (in_requested.ext.getTag() == out_suggested->ext.getTag()) {
+            if (out_suggested->ext.getTag() == AudioPortExt::Tag::mix) {
+                // 'AudioMixPortExt.handle' is set by the client, copy from in_requested
+                out_suggested->ext.get<AudioPortExt::Tag::mix>().handle =
+                        in_requested.ext.get<AudioPortExt::Tag::mix>().handle;
+            }
+        } else {
+            LOG(WARNING) << __func__ << ": requested ext tag "
+                         << toString(in_requested.ext.getTag()) << " do not match port's tag "
+                         << toString(out_suggested->ext.getTag());
+            requestedIsValid = false;
+        }
+    }
+
     if (existing == configs.end() && requestedIsValid && requestedIsFullySpecified) {
         out_suggested->id = getConfig().nextPortId++;
         configs.push_back(*out_suggested);
diff --git a/audio/aidl/vts/VtsHalAudioCoreModuleTargetTest.cpp b/audio/aidl/vts/VtsHalAudioCoreModuleTargetTest.cpp
index 1222fd5..b6015ff 100644
--- a/audio/aidl/vts/VtsHalAudioCoreModuleTargetTest.cpp
+++ b/audio/aidl/vts/VtsHalAudioCoreModuleTargetTest.cpp
@@ -88,6 +88,7 @@
 using aidl::android::media::audio::common::AudioPortConfig;
 using aidl::android::media::audio::common::AudioPortDeviceExt;
 using aidl::android::media::audio::common::AudioPortExt;
+using aidl::android::media::audio::common::AudioPortMixExt;
 using aidl::android::media::audio::common::AudioSource;
 using aidl::android::media::audio::common::AudioUsage;
 using aidl::android::media::audio::common::Boolean;
@@ -1524,6 +1525,8 @@
     AudioPortConfig portConfig;
     AudioPortConfig suggestedConfig;
     portConfig.portId = srcMixPort.value().id;
+    const int32_t kIoHandle = 42;
+    portConfig.ext = AudioPortMixExt{.handle = kIoHandle};
     {
         bool applied = true;
         ASSERT_IS_OK(module->setAudioPortConfig(portConfig, &suggestedConfig, &applied))
@@ -1535,18 +1538,22 @@
     EXPECT_TRUE(suggestedConfig.channelMask.has_value());
     EXPECT_TRUE(suggestedConfig.format.has_value());
     EXPECT_TRUE(suggestedConfig.flags.has_value());
+    ASSERT_EQ(AudioPortExt::Tag::mix, suggestedConfig.ext.getTag());
+    EXPECT_EQ(kIoHandle, suggestedConfig.ext.get<AudioPortExt::Tag::mix>().handle);
     WithAudioPortConfig applied(suggestedConfig);
     ASSERT_NO_FATAL_FAILURE(applied.SetUp(module.get()));
     const AudioPortConfig& appliedConfig = applied.get();
     EXPECT_NE(0, appliedConfig.id);
-    EXPECT_TRUE(appliedConfig.sampleRate.has_value());
+    ASSERT_TRUE(appliedConfig.sampleRate.has_value());
     EXPECT_EQ(suggestedConfig.sampleRate.value(), appliedConfig.sampleRate.value());
-    EXPECT_TRUE(appliedConfig.channelMask.has_value());
+    ASSERT_TRUE(appliedConfig.channelMask.has_value());
     EXPECT_EQ(suggestedConfig.channelMask.value(), appliedConfig.channelMask.value());
-    EXPECT_TRUE(appliedConfig.format.has_value());
+    ASSERT_TRUE(appliedConfig.format.has_value());
     EXPECT_EQ(suggestedConfig.format.value(), appliedConfig.format.value());
-    EXPECT_TRUE(appliedConfig.flags.has_value());
+    ASSERT_TRUE(appliedConfig.flags.has_value());
     EXPECT_EQ(suggestedConfig.flags.value(), appliedConfig.flags.value());
+    ASSERT_EQ(AudioPortExt::Tag::mix, appliedConfig.ext.getTag());
+    EXPECT_EQ(kIoHandle, appliedConfig.ext.get<AudioPortExt::Tag::mix>().handle);
 }
 
 TEST_P(AudioCoreModule, SetAllAttachedDevicePortConfigs) {