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diff --git a/game/server/envmicrophone.h b/game/server/envmicrophone.h
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+++ b/game/server/envmicrophone.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef ENVMICROPHONE_H
+#define ENVMICROPHONE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+class CBaseFilter;
+
+
+const int SF_MICROPHONE_SOUND_COMBAT			= 0x01;
+const int SF_MICROPHONE_SOUND_WORLD				= 0x02;
+const int SF_MICROPHONE_SOUND_PLAYER			= 0x04;
+const int SF_MICROPHONE_SOUND_BULLET_IMPACT		= 0x08;
+const int SF_MICROPHONE_SWALLOW_ROUTED_SOUNDS	= 0x10;
+const int SF_MICROPHONE_SOUND_EXPLOSION			= 0x20;
+const int SF_MICROPHONE_IGNORE_NONATTENUATED	= 0x40;
+
+
+// Return codes from SoundPlayed
+enum MicrophoneResult_t
+{
+    MicrophoneResult_Ok = 0,
+    MicrophoneResult_Swallow,       // The microphone swallowed the sound. Don't play it.
+    MicrophoneResult_Remove,        // The microphone should be removed from the list of microphones.
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+class CEnvMicrophone : public CPointEntity
+{
+	DECLARE_CLASS( CEnvMicrophone, CPointEntity );
+
+public:
+	~CEnvMicrophone();
+
+	void Spawn(void);
+	void Activate(void);
+	void OnRestore( void );
+	void ActivateSpeaker( void );
+	void Think(void);
+	bool CanHearSound(CSound *pSound, float &flVolume);
+	bool CanHearSound( int entindex, soundlevel_t soundlevel, float &flVolume, const Vector *pOrigin );
+
+	void SetSensitivity( float flSensitivity );
+	void SetSpeakerName( string_t iszSpeakerName );
+
+	void InputEnable( inputdata_t &inputdata );
+	void InputDisable( inputdata_t &inputdata );
+	void InputSetSpeakerName( inputdata_t &inputdata );
+
+	DECLARE_DATADESC();
+
+	// Hook for the sound system to tell us when a sound's been played. Returns true if it's to swallow the passed in sound.
+	static bool OnSoundPlayed( int entindex, const char *soundname, soundlevel_t soundlevel, 
+		float flVolume, int iFlags, int iPitch, const Vector *pOrigin, float soundtime, CUtlVector< Vector >& soundorigins );
+
+private:
+
+	// Per-microphone notification that a sound has played.
+	MicrophoneResult_t SoundPlayed( int entindex, const char *soundname, soundlevel_t soundlevel, 
+		float flVolume, int iFlags, int iPitch, const Vector *pOrigin, float soundtime, CUtlVector< Vector >& soundorigins );
+
+	bool		m_bDisabled;			// If true, the microphone will not measure sound.
+	EHANDLE		m_hMeasureTarget;		// Point at which to measure sound level.
+	int			m_nSoundMask;			// Which sound types we are interested in.
+	float		m_flSensitivity;		// 0 = deaf, 1 = default, 10 = maximum sensitivity
+	float		m_flSmoothFactor;		// 0 = no smoothing of samples, 0.9 = maximum smoothing
+	float		m_flMaxRange;			// Maximum sound hearing range, irrelevant of attenuation
+	string_t	m_iszSpeakerName;		// Name of a speaker to output any heard sounds through
+	EHANDLE		m_hSpeaker;				// Speaker to output any heard sounds through
+	bool		m_bAvoidFeedback;
+	int			m_iSpeakerDSPPreset;	// Speaker DSP preset to use when this microphone is enabled
+	string_t	m_iszListenFilter;
+	CHandle<CBaseFilter>	m_hListenFilter;
+
+	COutputFloat m_SoundLevel;			// Fired when the sampled volume level changes.
+	COutputEvent m_OnRoutedSound;		// Fired when a sound has been played through our speaker
+	COutputEvent m_OnHeardSound;		// Heard sound.
+
+	char		m_szLastSound[256];
+};
+
+#endif // ENVMICROPHONE_H