/usr/include/sipxtapi/mp/MprEchoSuppress.h is in libsipxtapi-dev 3.3.0~test17-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Copyright (C) 2006 SIPez LLC. 
// Licensed to SIPfoundry under a Contributor Agreement. 
//
// Copyright (C) 2004-2006 SIPfoundry Inc.
// Licensed by SIPfoundry under the LGPL license.
//
// Copyright (C) 2004-2006 Pingtel Corp.  All rights reserved.
// Licensed to SIPfoundry under a Contributor Agreement.
//
// $$
///////////////////////////////////////////////////////////////////////////////
#ifndef _MprEchoSuppress_h_
#define _MprEchoSuppress_h_
// SYSTEM INCLUDES
// APPLICATION INCLUDES
#include "os/OsStatus.h"
#include "mp/MpAudioResource.h"
// DEFINES
// MACROS
// EXTERNAL FUNCTIONS
// EXTERNAL VARIABLES
// CONSTANTS
// STRUCTS
// TYPEDEFS
// FORWARD DECLARATIONS
class MprToSpkr;
class FilterBank;
class HandsetFilterBank;
/**
*  @brief The "Echo suppress" media processing resource
*/
class MprEchoSuppress : public MpAudioResource
{
/* //////////////////////////// PUBLIC //////////////////////////////////// */
public:
/* ============================ CREATORS ================================== */
///@name Manipulators
//@{
     /// Constructor
   MprEchoSuppress(const UtlString& rName);
     /// Destructor
   virtual
   ~MprEchoSuppress();
//@}
/* ============================ MANIPULATORS ============================== */
///@name Manipulators
//@{
   void setSpkrPal(MprToSpkr* pal);
   int startSpeech();
   int endSpeech();
//@}
/* ============================ ACCESSORS ================================= */
///@name Accessors
//@{
//@}
/* ============================ INQUIRY =================================== */
///@name Inquiry
//@{
//@}
/* //////////////////////////// PROTECTED ///////////////////////////////// */
protected:
/* //////////////////////////// PRIVATE /////////////////////////////////// */
private:
   short                mState;
   MprToSpkr*           mpSpkrPal;
   MpAudioBufPtr        mpPrev;
   int                  mTicksPerFrame;
   int                  mSpeechFake;
   short                mshDelay;
   FilterBank*          mpFilterBank;
   HandsetFilterBank*   mpHandsetFilterBank;
   MpBufPtr LoudspeakerFade(MpBufPtr in, short& shSpkState, int iFreezeFlag);
   void frame_match(const MpAudioBufPtr &in);
   virtual UtlBoolean doProcessFrame(MpBufPtr inBufs[],
                                    MpBufPtr outBufs[],
                                    int inBufsSize,
                                    int outBufsSize,
                                    UtlBoolean isEnabled,
                                    int samplesPerFrame,
                                    int samplesPerSecond);
   void control_logic(unsigned long       ulSigIn,
                      unsigned long       ulSigOut,
                              short&      shSpkState,
                                int       iFreezeFlag);
     /// Copy constructor (not implemented for this class)
   MprEchoSuppress(const MprEchoSuppress& rMprEchoSuppress);
     /// Assignment operator (not implemented for this class)
   MprEchoSuppress& operator=(const MprEchoSuppress& rhs);
};
/* ============================ INLINE METHODS ============================ */
#endif  // _MprEchoSuppress_h_
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