diff --git a/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h b/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h
index cc43fe6..33e506f 100644
--- a/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h
+++ b/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h
@@ -135,11 +135,18 @@
     /**
      * @brief filter the devices supported by this collection against another collection
      * @param devices to filter against
-     * @return
+     * @return a filtered DeviceVector
      */
     DeviceVector filter(const DeviceVector &devices) const;
 
     /**
+     * @brief filter the devices supported by this collection before sending
+     * then to the Engine via AudioPolicyManagerObserver interface
+     * @return a filtered DeviceVector
+     */
+    DeviceVector filterForEngine() const;
+
+    /**
      * @brief merge two vectors. As SortedVector Implementation is buggy (it does not check the size
      * of the destination vector, only of the source, it provides a safe implementation
      * @param devices source device vector to merge with
diff --git a/services/audiopolicy/common/managerdefinitions/src/DeviceDescriptor.cpp b/services/audiopolicy/common/managerdefinitions/src/DeviceDescriptor.cpp
index 1a74f48..ecd5b34 100644
--- a/services/audiopolicy/common/managerdefinitions/src/DeviceDescriptor.cpp
+++ b/services/audiopolicy/common/managerdefinitions/src/DeviceDescriptor.cpp
@@ -399,6 +399,18 @@
     return filter(devices).size() == devices.size();
 }
 
+DeviceVector DeviceVector::filterForEngine() const
+{
+    DeviceVector filteredDevices;
+    for (const auto &device : *this) {
+        if (audio_is_remote_submix_device(device->type()) && device->address() != "0") {
+            continue;
+        }
+        filteredDevices.add(device);
+    }
+    return filteredDevices;
+}
+
 void DeviceDescriptor::log() const
 {
     ALOGI("Device id:%d type:0x%08X:%s, addr:%s", mId,  mDeviceType,
diff --git a/services/audiopolicy/engine/interface/AudioPolicyManagerObserver.h b/services/audiopolicy/engine/interface/AudioPolicyManagerObserver.h
index 43ba625..ebd82a7 100644
--- a/services/audiopolicy/engine/interface/AudioPolicyManagerObserver.h
+++ b/services/audiopolicy/engine/interface/AudioPolicyManagerObserver.h
@@ -46,9 +46,9 @@
 
     virtual const AudioInputCollection &getInputs() const = 0;
 
-    virtual const DeviceVector &getAvailableOutputDevices() const = 0;
+    virtual const DeviceVector getAvailableOutputDevices() const = 0;
 
-    virtual const DeviceVector &getAvailableInputDevices() const = 0;
+    virtual const DeviceVector getAvailableInputDevices() const = 0;
 
     virtual const sp<DeviceDescriptor> &getDefaultOutputDevice() const = 0;
 
diff --git a/services/audiopolicy/engineconfigurable/src/Engine.cpp b/services/audiopolicy/engineconfigurable/src/Engine.cpp
index 89aaa84..e59d983 100644
--- a/services/audiopolicy/engineconfigurable/src/Engine.cpp
+++ b/services/audiopolicy/engineconfigurable/src/Engine.cpp
@@ -207,7 +207,7 @@
         ALOGE("%s: Trying to get device on invalid strategy %d", __FUNCTION__, ps);
         return {};
     }
-    const DeviceVector &availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
+    const DeviceVector availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
     const SwAudioOutputCollection &outputs = getApmObserver()->getOutputs();
     uint32_t availableOutputDevicesType = availableOutputDevices.types();
 
@@ -272,7 +272,7 @@
         return DeviceVector(preferredDevice);
     }
     product_strategy_t strategy = getProductStrategyForAttributes(attributes);
-    const DeviceVector &availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
+    const DeviceVector availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
     const SwAudioOutputCollection &outputs = getApmObserver()->getOutputs();
     //
     // @TODO: what is the priority of explicit routing? Shall it be considered first as it used to
@@ -298,7 +298,7 @@
                                                          sp<AudioPolicyMix> *mix) const
 {
     const auto &policyMixes = getApmObserver()->getAudioPolicyMixCollection();
-    const auto &availableInputDevices = getApmObserver()->getAvailableInputDevices();
+    const auto availableInputDevices = getApmObserver()->getAvailableInputDevices();
     const auto &inputs = getApmObserver()->getInputs();
     std::string address;
     //
diff --git a/services/audiopolicy/enginedefault/src/Engine.cpp b/services/audiopolicy/enginedefault/src/Engine.cpp
index 66a6965..592a0b9 100644
--- a/services/audiopolicy/enginedefault/src/Engine.cpp
+++ b/services/audiopolicy/enginedefault/src/Engine.cpp
@@ -502,8 +502,8 @@
 
 audio_devices_t Engine::getDeviceForInputSource(audio_source_t inputSource) const
 {
-    const DeviceVector &availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
-    const DeviceVector &availableInputDevices = getApmObserver()->getAvailableInputDevices();
+    const DeviceVector availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
+    const DeviceVector availableInputDevices = getApmObserver()->getAvailableInputDevices();
     const SwAudioOutputCollection &outputs = getApmObserver()->getOutputs();
     audio_devices_t availableDeviceTypes = availableInputDevices.types() & ~AUDIO_DEVICE_BIT_IN;
 
@@ -704,7 +704,7 @@
         return DeviceVector(preferredDevice);
     }
     product_strategy_t strategy = getProductStrategyForAttributes(attributes);
-    const DeviceVector &availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
+    const DeviceVector availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
     const SwAudioOutputCollection &outputs = getApmObserver()->getOutputs();
     //
     // @TODO: what is the priority of explicit routing? Shall it be considered first as it used to
@@ -730,7 +730,7 @@
                                                          sp<AudioPolicyMix> *mix) const
 {
     const auto &policyMixes = getApmObserver()->getAudioPolicyMixCollection();
-    const auto &availableInputDevices = getApmObserver()->getAvailableInputDevices();
+    const auto availableInputDevices = getApmObserver()->getAvailableInputDevices();
     const auto &inputs = getApmObserver()->getInputs();
     std::string address;
 
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index a12bdaa..b9cd7d0 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -423,8 +423,7 @@
     if (!audio_is_output_device(device) && !audio_is_input_device(device)) return BAD_VALUE;
 
     // Check if the device is currently connected
-    DeviceVector availableDevices = getAvailableOutputDevices();
-    DeviceVector deviceList = availableDevices.getDevicesFromTypeMask(device);
+    DeviceVector deviceList = mAvailableOutputDevices.getDevicesFromTypeMask(device);
     if (deviceList.empty()) {
         // Nothing to do: device is not connected
         return NO_ERROR;
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.h b/services/audiopolicy/managerdefault/AudioPolicyManager.h
index 26208c8..a700868 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.h
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.h
@@ -342,13 +342,13 @@
         {
             return mInputs;
         }
-        virtual const DeviceVector &getAvailableOutputDevices() const
+        virtual const DeviceVector getAvailableOutputDevices() const
         {
-            return mAvailableOutputDevices;
+            return mAvailableOutputDevices.filterForEngine();
         }
-        virtual const DeviceVector &getAvailableInputDevices() const
+        virtual const DeviceVector getAvailableInputDevices() const
         {
-            return mAvailableInputDevices;
+            return mAvailableInputDevices.filterForEngine();
         }
         virtual const sp<DeviceDescriptor> &getDefaultOutputDevice() const
         {