diff --git a/services/audiopolicy/common/managerdefinitions/Android.mk b/services/audiopolicy/common/managerdefinitions/Android.mk
index 976e60d..85f33bb 100644
--- a/services/audiopolicy/common/managerdefinitions/Android.mk
+++ b/services/audiopolicy/common/managerdefinitions/Android.mk
@@ -14,6 +14,7 @@
     src/AudioOutputDescriptor.cpp \
     src/EffectDescriptor.cpp \
     src/ConfigParsingUtils.cpp \
+    src/SoundTriggerSession.cpp \
 
 LOCAL_SHARED_LIBRARIES := \
     libcutils \
diff --git a/services/audiopolicy/common/managerdefinitions/include/SoundTriggerSession.h b/services/audiopolicy/common/managerdefinitions/include/SoundTriggerSession.h
new file mode 100644
index 0000000..420e6d7
--- /dev/null
+++ b/services/audiopolicy/common/managerdefinitions/include/SoundTriggerSession.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <system/audio.h>
+#include <utils/Errors.h>
+#include <utils/KeyedVector.h>
+
+namespace android {
+
+class SoundTriggerSessionCollection : public DefaultKeyedVector<audio_session_t, audio_io_handle_t>
+{
+public:
+    status_t releaseSession(audio_session_t session);
+
+    status_t acquireSession(audio_session_t session, audio_io_handle_t ioHandle);
+};
+
+}; // namespace android
diff --git a/services/audiopolicy/common/managerdefinitions/src/SoundTriggerSession.cpp b/services/audiopolicy/common/managerdefinitions/src/SoundTriggerSession.cpp
new file mode 100644
index 0000000..8ca3ae0
--- /dev/null
+++ b/services/audiopolicy/common/managerdefinitions/src/SoundTriggerSession.cpp
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "APM::SoundTriggerSession"
+//#define LOG_NDEBUG 0
+
+#include "SoundTriggerSession.h"
+
+
+namespace android {
+
+status_t SoundTriggerSessionCollection::acquireSession(audio_session_t session,
+                                                                   audio_io_handle_t ioHandle)
+{
+    add(session, ioHandle);
+
+    return NO_ERROR;
+}
+
+status_t SoundTriggerSessionCollection::releaseSession(audio_session_t session)
+{
+    ssize_t index = indexOfKey(session);
+    if (index < 0) {
+        ALOGW("acquireSoundTriggerSession() session %d not registered", session);
+        return BAD_VALUE;
+    }
+
+    removeItem(session);
+    return NO_ERROR;
+}
+
+}; //namespace android
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 01400ec..5341559 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -2458,21 +2458,7 @@
     *ioHandle = (audio_io_handle_t)mpClientInterface->newAudioUniqueId();
     *device = getDeviceAndMixForInputSource(AUDIO_SOURCE_HOTWORD);
 
-    mSoundTriggerSessions.add(*session, *ioHandle);
-
-    return NO_ERROR;
-}
-
-status_t AudioPolicyManager::releaseSoundTriggerSession(audio_session_t session)
-{
-    ssize_t index = mSoundTriggerSessions.indexOfKey(session);
-    if (index < 0) {
-        ALOGW("acquireSoundTriggerSession() session %d not registered", session);
-        return BAD_VALUE;
-    }
-
-    mSoundTriggerSessions.removeItem(session);
-    return NO_ERROR;
+    return mSoundTriggerSessions.acquireSession(*session, *ioHandle);
 }
 
 // ----------------------------------------------------------------------------
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.h b/services/audiopolicy/managerdefault/AudioPolicyManager.h
index 79add3b..b881aaa 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.h
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.h
@@ -38,6 +38,7 @@
 #include <AudioOutputDescriptor.h>
 #include <AudioPolicyMix.h>
 #include <EffectDescriptor.h>
+#include <SoundTriggerSession.h>
 
 namespace android {
 
@@ -208,7 +209,10 @@
                                                audio_io_handle_t *ioHandle,
                                                audio_devices_t *device);
 
-        virtual status_t releaseSoundTriggerSession(audio_session_t session);
+        virtual status_t releaseSoundTriggerSession(audio_session_t session)
+        {
+            return mSoundTriggerSessions.releaseSession(session);
+        }
 
         virtual status_t registerPolicyMixes(Vector<AudioMix> mixes);
         virtual status_t unregisterPolicyMixes(Vector<AudioMix> mixes);
@@ -448,7 +452,7 @@
 
         AudioPatchCollection mAudioPatches;
 
-        DefaultKeyedVector<audio_session_t, audio_io_handle_t> mSoundTriggerSessions;
+        SoundTriggerSessionCollection mSoundTriggerSessions;
 
         sp<AudioPatch> mCallTxPatch;
         sp<AudioPatch> mCallRxPatch;