diff --git a/services/audiopolicy/engine/common/src/EngineBase.cpp b/services/audiopolicy/engine/common/src/EngineBase.cpp
index 46b950c..525e965 100644
--- a/services/audiopolicy/engine/common/src/EngineBase.cpp
+++ b/services/audiopolicy/engine/common/src/EngineBase.cpp
@@ -141,6 +141,15 @@
         result = {std::make_unique<engineConfig::Config>(config),
                   static_cast<size_t>(ret == NO_ERROR ? 0 : 1)};
     }
+    // Append for internal use only strategies/volume groups (e.g. rerouting/patch)
+    result.parsedConfig->productStrategies.insert(
+                std::end(result.parsedConfig->productStrategies),
+                std::begin(gOrderedSystemStrategies), std::end(gOrderedSystemStrategies));
+
+    result.parsedConfig->volumeGroups.insert(
+                std::end(result.parsedConfig->volumeGroups),
+                std::begin(gSystemVolumeGroups), std::end(gSystemVolumeGroups));
+
     ALOGE_IF(result.nbSkippedElement != 0, "skipped %zu elements", result.nbSkippedElement);
 
     engineConfig::VolumeGroup defaultVolumeConfig;
diff --git a/services/audiopolicy/engine/common/src/EngineDefaultConfig.h b/services/audiopolicy/engine/common/src/EngineDefaultConfig.h
index 6331856..a3071d7 100644
--- a/services/audiopolicy/engine/common/src/EngineDefaultConfig.h
+++ b/services/audiopolicy/engine/common/src/EngineDefaultConfig.h
@@ -118,15 +118,22 @@
             AUDIO_FLAG_BEACON, ""}}
          }
      },
-    },
-    {"STRATEGY_REROUTING",
+    }
+};
+
+/**
+ * For Internal use of respectively audio policy and audioflinger
+ * For compatibility reason why apm volume config file, volume group name is the stream type.
+ */
+const engineConfig::ProductStrategies gOrderedSystemStrategies = {
+    {"rerouting",
      {
          {"", AUDIO_STREAM_REROUTING, "AUDIO_STREAM_REROUTING",
           {{AUDIO_CONTENT_TYPE_UNKNOWN, AUDIO_USAGE_UNKNOWN, AUDIO_SOURCE_DEFAULT, 0, ""}}
          }
      },
     },
-    {"STRATEGY_PATCH",
+    {"patch",
      {
          {"", AUDIO_STREAM_PATCH, "AUDIO_STREAM_PATCH",
           {{AUDIO_CONTENT_TYPE_UNKNOWN, AUDIO_USAGE_UNKNOWN, AUDIO_SOURCE_DEFAULT, 0, ""}}
@@ -134,6 +141,28 @@
      },
     }
 };
+const engineConfig::VolumeGroups gSystemVolumeGroups = {
+    {"AUDIO_STREAM_REROUTING", 0, 1,
+     {
+         {"DEVICE_CATEGORY_SPEAKER", {{0,0}, {100, 0}}},
+         {"DEVICE_CATEGORY_HEADSET", {{0,0}, {100, 0}}},
+         {"DEVICE_CATEGORY_EARPIECE", {{0,0}, {100, 0}}},
+         {"DEVICE_CATEGORY_EXT_MEDIA", {{0,0}, {100, 0}}},
+         {"DEVICE_CATEGORY_HEARING_AID", {{0,0}, {100, 0}}},
+
+     }
+    },
+    {"AUDIO_STREAM_PATCH", 0, 1,
+     {
+         {"DEVICE_CATEGORY_SPEAKER", {{0,0}, {100, 0}}},
+         {"DEVICE_CATEGORY_HEADSET", {{0,0}, {100, 0}}},
+         {"DEVICE_CATEGORY_EARPIECE", {{0,0}, {100, 0}}},
+         {"DEVICE_CATEGORY_EXT_MEDIA", {{0,0}, {100, 0}}},
+         {"DEVICE_CATEGORY_HEARING_AID", {{0,0}, {100, 0}}},
+
+     }
+    }
+};
 
 const engineConfig::Config gDefaultEngineConfig = {
     1.0,
diff --git a/services/audiopolicy/engineconfigurable/config/example/automotive/audio_policy_engine_product_strategies.xml b/services/audiopolicy/engineconfigurable/config/example/automotive/audio_policy_engine_product_strategies.xml
index 337de71..f598cf2 100644
--- a/services/audiopolicy/engineconfigurable/config/example/automotive/audio_policy_engine_product_strategies.xml
+++ b/services/audiopolicy/engineconfigurable/config/example/automotive/audio_policy_engine_product_strategies.xml
@@ -147,10 +147,6 @@
     <ProductStrategy name="notification">
         <AttributesGroup streamType="AUDIO_STREAM_NOTIFICATION" volumeGroup="ring">
             <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION"/> </Attributes>
-            <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION_COMMUNICATION_INSTANT"/> </Attributes>
-            <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION_COMMUNICATION_DELAYED"/> </Attributes>
-            <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION_COMMUNICATION_REQUEST"/> </Attributes>
-            <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION_EVENT"/> </Attributes>
         </AttributesGroup>
     </ProductStrategy>
     <ProductStrategy name="system">
@@ -167,19 +163,5 @@
         </AttributesGroup>
     </ProductStrategy>
 
-    <!-- Routing Strategy rerouting may be removed as following media??? -->
-    <ProductStrategy name="rerouting">
-        <AttributesGroup streamType="AUDIO_STREAM_REROUTING" volumeGroup="rerouting">
-            <Attributes></Attributes>
-        </AttributesGroup>
-    </ProductStrategy>
-
-    <!-- Patch stream needs full scale volume, define it otherwise switch to default... -->
-    <ProductStrategy name="patch">
-        <AttributesGroup streamType="AUDIO_STREAM_PATCH" volumeGroup="patch">
-            <Attributes></Attributes>
-        </AttributesGroup>
-    </ProductStrategy>
-
 </ProductStrategies>
 
diff --git a/services/audiopolicy/engineconfigurable/config/example/automotive/audio_policy_engine_volumes.xml b/services/audiopolicy/engineconfigurable/config/example/automotive/audio_policy_engine_volumes.xml
index 97e6144..97a25a8 100644
--- a/services/audiopolicy/engineconfigurable/config/example/automotive/audio_policy_engine_volumes.xml
+++ b/services/audiopolicy/engineconfigurable/config/example/automotive/audio_policy_engine_volumes.xml
@@ -189,57 +189,5 @@
         </volume>
     </volumeGroup>
 
-    <volumeGroup>
-        <name>rerouting</name>
-        <indexMin>0</indexMin>
-        <indexMax>1</indexMax>
-        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-    </volumeGroup>
-
-    <volumeGroup>
-        <name>patch</name>
-        <indexMin>0</indexMin>
-        <indexMax>1</indexMax>
-        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-    </volumeGroup>
-
 </volumeGroups>
 
diff --git a/services/audiopolicy/engineconfigurable/config/example/caremu/audio_policy_engine_product_strategies.xml b/services/audiopolicy/engineconfigurable/config/example/caremu/audio_policy_engine_product_strategies.xml
index 3634313..f598cf2 100644
--- a/services/audiopolicy/engineconfigurable/config/example/caremu/audio_policy_engine_product_strategies.xml
+++ b/services/audiopolicy/engineconfigurable/config/example/caremu/audio_policy_engine_product_strategies.xml
@@ -147,10 +147,6 @@
     <ProductStrategy name="notification">
         <AttributesGroup streamType="AUDIO_STREAM_NOTIFICATION" volumeGroup="ring">
             <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION"/> </Attributes>
-            <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION_COMMUNICATION_INSTANT"/> </Attributes>
-            <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION_COMMUNICATION_DELAYED"/> </Attributes>
-            <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION_COMMUNICATION_REQUEST"/> </Attributes>
-            <Attributes> <Usage value="AUDIO_USAGE_NOTIFICATION_EVENT"/> </Attributes>
         </AttributesGroup>
     </ProductStrategy>
     <ProductStrategy name="system">
@@ -167,18 +163,5 @@
         </AttributesGroup>
     </ProductStrategy>
 
-    <!-- Routing Strategy rerouting may be removed as following media??? -->
-    <ProductStrategy name="rerouting">
-        <AttributesGroup streamType="AUDIO_STREAM_REROUTING" volumeGroup="rerouting">
-            <Attributes></Attributes>
-        </AttributesGroup>
-    </ProductStrategy>
-
-    <!-- Patch stream needs full scale volume, define it otherwise switch to default... -->
-    <ProductStrategy name="patch">
-        <AttributesGroup streamType="AUDIO_STREAM_PATCH" volumeGroup="patch">
-            <Attributes></Attributes>
-        </AttributesGroup>
-    </ProductStrategy>
 </ProductStrategies>
 
diff --git a/services/audiopolicy/engineconfigurable/config/example/caremu/audio_policy_engine_volumes.xml b/services/audiopolicy/engineconfigurable/config/example/caremu/audio_policy_engine_volumes.xml
index 97e6144..97a25a8 100644
--- a/services/audiopolicy/engineconfigurable/config/example/caremu/audio_policy_engine_volumes.xml
+++ b/services/audiopolicy/engineconfigurable/config/example/caremu/audio_policy_engine_volumes.xml
@@ -189,57 +189,5 @@
         </volume>
     </volumeGroup>
 
-    <volumeGroup>
-        <name>rerouting</name>
-        <indexMin>0</indexMin>
-        <indexMax>1</indexMax>
-        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-    </volumeGroup>
-
-    <volumeGroup>
-        <name>patch</name>
-        <indexMin>0</indexMin>
-        <indexMax>1</indexMax>
-        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID">
-            <point>0,0</point>
-            <point>100,0</point>
-        </volume>
-    </volumeGroup>
-
 </volumeGroups>
 
diff --git a/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_product_strategies.xml b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_product_strategies.xml
index b1c0dcf..a7388da 100644
--- a/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_product_strategies.xml
+++ b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_product_strategies.xml
@@ -97,20 +97,5 @@
         </AttributesGroup>
     </ProductStrategy>
 
-    <!-- Routing Strategy rerouting may be removed as following media??? -->
-    <ProductStrategy name="STRATEGY_REROUTING">
-        <AttributesGroup streamType="AUDIO_STREAM_REROUTING" volumeGroup="rerouting">
-            <Attributes></Attributes>
-        </AttributesGroup>
-    </ProductStrategy>
-
-    <!-- Default product strategy has empty attributes -->
-    <ProductStrategy name="STRATEGY_PATCH">
-        <AttributesGroup streamType="AUDIO_STREAM_PATCH" volumeGroup="patch">
-            <Attributes></Attributes>
-        </AttributesGroup>
-    </ProductStrategy>
-
-
 </ProductStrategies>
 
diff --git a/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_stream_volumes.xml b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_stream_volumes.xml
index 0f9614e..8aa71ca 100644
--- a/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_stream_volumes.xml
+++ b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_stream_volumes.xml
@@ -215,26 +215,6 @@
         <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
         <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID"  ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
     </volumeGroup>
-    <volumeGroup>
-        <name>rerouting</name>
-        <indexMin>0</indexMin>
-        <indexMax>1</indexMax>
-        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="FULL_SCALE_VOLUME_CURVE"/>
-    </volumeGroup>
 
-    <volumeGroup>
-        <name>patch</name>
-        <indexMin>0</indexMin>
-        <indexMax>1</indexMax>
-        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="FULL_SCALE_VOLUME_CURVE"/>
-    </volumeGroup>
 </volumeGroups>
 
diff --git a/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_product_strategies.xml b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_product_strategies.xml
index b1c0dcf..a7388da 100644
--- a/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_product_strategies.xml
+++ b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_product_strategies.xml
@@ -97,20 +97,5 @@
         </AttributesGroup>
     </ProductStrategy>
 
-    <!-- Routing Strategy rerouting may be removed as following media??? -->
-    <ProductStrategy name="STRATEGY_REROUTING">
-        <AttributesGroup streamType="AUDIO_STREAM_REROUTING" volumeGroup="rerouting">
-            <Attributes></Attributes>
-        </AttributesGroup>
-    </ProductStrategy>
-
-    <!-- Default product strategy has empty attributes -->
-    <ProductStrategy name="STRATEGY_PATCH">
-        <AttributesGroup streamType="AUDIO_STREAM_PATCH" volumeGroup="patch">
-            <Attributes></Attributes>
-        </AttributesGroup>
-    </ProductStrategy>
-
-
 </ProductStrategies>
 
diff --git a/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_stream_volumes.xml b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_stream_volumes.xml
index a259950..d5c3896 100644
--- a/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_stream_volumes.xml
+++ b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_stream_volumes.xml
@@ -217,26 +217,5 @@
         <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID"  ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
     </volumeGroup>
 
-    <volumeGroup>
-        <name>rerouting</name>
-        <indexMin>0</indexMin>
-        <indexMax>1</indexMax>
-        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="FULL_SCALE_VOLUME_CURVE"/>
-    </volumeGroup>
-
-    <volumeGroup>
-        <name>patch</name>
-        <indexMin>0</indexMin>
-        <indexMax>1</indexMax>
-        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="FULL_SCALE_VOLUME_CURVE"/>
-        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="FULL_SCALE_VOLUME_CURVE"/>
-    </volumeGroup>
 </volumeGroups>