PHONEFEATURE_GETVOLUMEHEADSET           = $00002000;      { TAPI v2.0 }
  PHONEFEATURE_SETBUTTONINFO              = $00004000;      { TAPI v2.0 }
  PHONEFEATURE_SETDATA                    = $00008000;      { TAPI v2.0 }
  PHONEFEATURE_SETDISPLAY                 = $00010000;      { TAPI v2.0 }
  PHONEFEATURE_SETGAINHANDSET             = $00020000;      { TAPI v2.0 }
  PHONEFEATURE_SETGAINSPEAKER             = $00040000;      { TAPI v2.0 }
  PHONEFEATURE_SETGAINHEADSET             = $00080000;      { TAPI v2.0 }
  PHONEFEATURE_SETHOOKSWITCHHANDSET       = $00100000;      { TAPI v2.0 }
  PHONEFEATURE_SETHOOKSWITCHSPEAKER       = $00200000;      { TAPI v2.0 }
  PHONEFEATURE_SETHOOKSWITCHHEADSET       = $00400000;      { TAPI v2.0 }
  PHONEFEATURE_SETLAMP                    = $00800000;      { TAPI v2.0 }
  PHONEFEATURE_SETRING                    = $01000000;      { TAPI v2.0 }
  PHONEFEATURE_SETVOLUMEHANDSET           = $02000000;      { TAPI v2.0 }
  PHONEFEATURE_SETVOLUMESPEAKER           = $04000000;      { TAPI v2.0 }
  PHONEFEATURE_SETVOLUMEHEADSET           = $08000000;      { TAPI v2.0 }
{$ENDIF}

  PHONEHOOKSWITCHDEV_HANDSET              = $00000001;
  PHONEHOOKSWITCHDEV_SPEAKER              = $00000002;
  PHONEHOOKSWITCHDEV_HEADSET              = $00000004;

  PHONEHOOKSWITCHMODE_ONHOOK              = $00000001;
  PHONEHOOKSWITCHMODE_MIC                 = $00000002;
  PHONEHOOKSWITCHMODE_SPEAKER             = $00000004;
  PHONEHOOKSWITCHMODE_MICSPEAKER          = $00000008;
  PHONEHOOKSWITCHMODE_UNKNOWN             = $00000010;

{$IFDEF TAPI20}
  PHONEINITIALIZEEXOPTION_USEHIDDENWINDOW     = $00000001;  { TAPI v2.0 }
  PHONEINITIALIZEEXOPTION_USEEVENT            = $00000002;  { TAPI v2.0 }
  PHONEINITIALIZEEXOPTION_USECOMPLETIONPORT   = $00000003;  { TAPI v2.0 }
{$ENDIF}

  PHONELAMPMODE_DUMMY                     = $00000001;
  PHONELAMPMODE_OFF                       = $00000002;
  PHONELAMPMODE_STEADY                    = $00000004;
  PHONELAMPMODE_WINK                      = $00000008;
  PHONELAMPMODE_FLASH                     = $00000010;
  PHONELAMPMODE_FLUTTER                   = $00000020;
  PHONELAMPMODE_BROKENFLUTTER             = $00000040;
  PHONELAMPMODE_UNKNOWN                   = $00000080;

  PHONEPRIVILEGE_MONITOR                  = $00000001;
  PHONEPRIVILEGE_OWNER                    = $00000002;

  PHONESTATE_OTHER                        = $00000001;
  PHONESTATE_CONNECTED                    = $00000002;
  PHONESTATE_DISCONNECTED                 = $00000004;
  PHONESTATE_OWNER                        = $00000008;
  PHONESTATE_MONITORS                     = $00000010;
  PHONESTATE_DISPLAY                      = $00000020;
  PHONESTATE_LAMP                         = $00000040;
  PHONESTATE_RINGMODE                     = $00000080;
  PHONESTATE_RINGVOLUME                   = $00000100;
  PHONESTATE_HANDSETHOOKSWITCH            = $00000200;
  PHONESTATE_HANDSETVOLUME                = $00000400;
  PHONESTATE_HANDSETGAIN                  = $00000800;
  PHONESTATE_SPEAKERHOOKSWITCH            = $00001000;
  PHONESTATE_SPEAKERVOLUME                = $00002000;
  PHONESTATE_SPEAKERGAIN                  = $00004000;
  PHONESTATE_HEADSETHOOKSWITCH            = $00008000;
  PHONESTATE_HEADSETVOLUME                = $00010000;
  PHONESTATE_HEADSETGAIN                  = $00020000;
  PHONESTATE_SUSPEND                      = $00040000;
  PHONESTATE_RESUME                       = $00080000;
  PHONESTATE_DEVSPECIFIC                  = $00100000;
  PHONESTATE_REINIT                       = $00200000;
  PHONESTATE_CAPSCHANGE                   = $00400000;      { TAPI v1.4 }
  PHONESTATE_REMOVED                      = $00800000;      { TAPI v1.4 }

  PHONESTATUSFLAGS_CONNECTED              = $00000001;
  PHONESTATUSFLAGS_SUSPENDED              = $00000002;

  STRINGFORMAT_ASCII                      = $00000001;
  STRINGFORMAT_DBCS                       = $00000002;
  STRINGFORMAT_UNICODE                    = $00000003;
  STRINGFORMAT_BINARY                     = $00000004;

  TAPI_REPLY                              = WM_USER + 99;

  TAPIERR_CONNECTED                       = 0;
  TAPIERR_DROPPED                         = -1;
  TAPIERR_NOREQUESTRECIPIENT              = -2;
  TAPIERR_REQUESTQUEUEFULL                = -3;
  TAPIERR_INVALDESTADDRESS                = -4;
  TAPIERR_INVALWINDOWHANDLE               = -5;
  TAPIERR_INVALDEVICECLASS                = -6;
  TAPIERR_INVALDEVICEID                   = -7;
  TAPIERR_DEVICECLASSUNAVAIL              = -8;
  TAPIERR_DEVICEIDUNAVAIL                 = -9;
  TAPIERR_DEVICEINUSE                     = -10;
  TAPIERR_DESTBUSY                        = -11;
  TAPIERR_DESTNOANSWER                    = -12;
  TAPIERR_DESTUNAVAIL                     = -13;
  TAPIERR_UNKNOWNWINHANDLE                = -14;
  TAPIERR_UNKNOWNREQUESTID                = -15;
  TAPIERR_REQUESTFAILED                   = -16;
  TAPIERR_REQUESTCANCELLED                = -17;
  TAPIERR_INVALPOINTER                    = -18;


  TAPIMAXDESTADDRESSSIZE                  = 80;
  TAPIMAXAPPNAMESIZE                      = 40;
  TAPIMAXCALLEDPARTYSIZE                  = 40;
  TAPIMAXCOMMENTSIZE                      = 80;
  TAPIMAXDEVICECLASSSIZE                  = 40;
  TAPIMAXDEVICEIDSIZE                     = 40;



type
  LPLineAddressCaps = ^TLineAddressCaps;
  TLineAddressCaps = record
    dwTotalSize,
    dwNeededSize,
    dwUsedSize,
    dwLineDeviceID,
    dwAddressSize,
    dwAddressOffset,
    dwDevSpecificSize,
    dwDevSpecificOffset,
    dwAddressSharing,
    dwAddressStates,
    dwCallInfoStates,
    dwCallerIDFlags,
    dwCalledIDFlags,
    dwConnectedIDFlags,
    dwRedirectionIDFlags,
    dwRedirectingIDFlags,
    dwCallStates,
    dwDialToneModes,
    dwBusyModes,
    dwSpecialInfo,
    dwDisconnectModes,
    dwMaxNumActiveCalls,
    dwMaxNumOnHoldCalls,
    dwMaxNumOnHoldPendingCalls,
    dwMaxNumConference,
    dwMaxNumTransConf,
    dwAddrCapFlags,
    dwCallFeatures,
    dwRemoveFromConfCaps,
    dwRemoveFromConfState,
    dwTransferModes,
    dwParkModes,
    dwForwardModes,
    dwMaxForwardEntries,
    dwMaxSpecificEntries,
    dwMinFwdNumRings,
    dwMaxFwdNumRings,
    dwMaxCallCompletions,
    dwCallCompletionConds,
    dwCallCompletionModes,
    dwNumCompletionMessages,
    dwCompletionMsgTextEntrySize,
    dwCompletionMsgTextSize,
    dwCompletionMsgTextOffset,

    dwAddressFeatures: Longint;                     { TAPI v1.4 }

{$IFDEF TAPI20}
    dwPredictiveAutoTransferStates,                 { TAPI v2.0 }
    dwNumCallTreatments,                            { TAPI v2.0 }
    dwCallTreatmentListSize,                        { TAPI v2.0 }
    dwCallTreatmentListOffset,                      { TAPI v2.0 }
    dwDeviceClassesSize,                            { TAPI v2.0 }
    dwDeviceClassesOffset,                          { TAPI v2.0 }
    dwMaxCallDataSize,                              { TAPI v2.0 }
    dwCallFeatures2,                                { TAPI v2.0 }
    dwMaxNoAnswerTimeout,                           { TAPI v2.0 }
    dwConnectedModes,                               { TAPI v2.0 }
    dwOfferingModes,                                { TAPI v2.0 }
    dwAvailableMediaModes: Longint;                 { TAPI v2.0 }
{$ENDIF}
  end;

  LPLineAddressStatus = ^TLineAddressStatus;
  TLineAddressStatus = record
    dwTotalSize,
    dwNeededSize,
    dwUsedSize,
    dwNumInUse,
    dwNumActiveCalls,
    dwNumOnHoldCalls,
    dwNumOnHoldPendCalls,
    dwAddressFeatures,
    dwNumRingsNoAnswer,
    dwForwardNumEntries,
    dwForwardSize,
    dwForwardOffset,
    dwTerminalModesSize,
    dwTerminalModesOffset,
    dwDevSpecificSize,
    dwDevSpecificOffset: Longint;
  end;

{$IFDEF TAPI20}
  LPLineAgentActivityEntry = ^TLineAgentActivityEntry;
  TLineAgentActivityEntry = record
    dwID,                                           { TAPI v2.0 }
    dwNameSize,                                     { TAPI v2.0 }
    dwNameOffset: Longint;                          { TAPI v2.0 }
  end;

  LPLineAgentActivityList = ^TLineAgentActivityList;
  TLineAgentActivityList = record
    dwTotalSize,                                    { TAPI v2.0 }
    dwNeededSize,                                   { TAPI v2.0 }
    dwUsedSize,                                     { TAPI v2.0 }
    dwNumEntries,                                   { TAPI v2.0 }
    dwListSize,                                     { TAPI v2.0 }
    dwListOffset: Longint;                          { TAPI v2.0 }
  end;

  LPLineAgentCaps = ^TLineAgentCaps;
  TLineAgentCaps = record
    dwTotalSize,                                    { TAPI v2.0 }
    dwNeededSize,                                   { TAPI v2.0 }
    dwUsedSize,                                     { TAPI v2.0 }
    dwAgentHandlerInfoSize,                         { TAPI v2.0 }
    dwAgentHandlerInfoOffset,                       { TAPI v2.0 }
    dwCapsVersion,                                  { TAPI v2.0 }
    dwFeatures,                                     { TAPI v2.0 }
    dwStates,                                       { TAPI v2.0 }
    dwNextStates,                                   { TAPI v2.0 }
    dwMaxNumGroupEntries,                           { TAPI v2.0 }
    dwAgentStatusMessages,                          { TAPI v2.0 }
    dwNumAgentExtensionIDs,                         { TAPI v2.0 }
    dwAgentExtensionIDListSize,                     { TAPI v2.0 }
    dwAgentExtensionIDListOffset: Longint;          { TAPI v2.0 }
  end;

  LPLineAgentGroupEntry = ^TLineAgentGroupEntry;
  TLineAgentGroupEntry = record
    GroupID: record
      dwGroupID1,                                   { TAPI v2.0 }
      dwGroupID2,                                   { TAPI v2.0 }
      dwGroupID3,                                   { TAPI v2.0 }
      dwGroupID4: Longint;                          { TAPI v2.0 }
    end;
    dwNameSize,                                     { TAPI v2.0 }
    dwNameOffset: Longint;                          { TAPI v2.0 }
  end;

  LPLineAgentGroupList = ^TLineAgentGroupList;
  TLineAgentGroupList = record
    dwTotalSize,                                    { TAPI v2.0 }
    dwNeededSize,                                   { TAPI v2.0 }
    dwUsedSize,                                     { TAPI v2.0 }
    dwNumEntries,                                   { TAPI v2.0 }
    dwListSize,                                     { TAPI v2.0 }
    dwListOffset: Longint;                          { TAPI v2.0 }
  end;

  LPLineAgentStatus = ^TLineAgentStatus;
  TLineAgentStatus = record
    dwTotalSize,                                    { TAPI v2.0 }
    dwNeededSize,                                   { TAPI v2.0 }
    dwUsedSize,                                     { TAPI v2.0 }
    dwNumEntries,                                   { TAPI v2.0 }
    dwGroupListSize,                                { TAPI v2.0 }
    dwGroupListOffset,                              { TAPI v2.0 }
    dwState,                                        { TAPI v2.0 }
    dwNextState,                                    { TAPI v2.0 }
    dwActivityID,                                   { TAPI v2.0 }
    dwActivitySize,                                 { TAPI v2.0 }
    dwActivityOffset,                               { TAPI v2.0 }
    dwAgentFeatures,                                { TAPI v2.0 }
    dwValidStates,                                  { TAPI v2.0 }
    dwValidNextStates: Longint;                     { TAPI v2.0 }
  end;

  LPLineAppInfo = ^TLineAppInfo;
  TLineAppInfo = record
    dwMachineNameSize,                              { TAPI v2.0 }
    dwMachineNameOffset,                            { TAPI v2.0 }
    dwUserNameSize,                                 { TAPI v2.0 }
    dwUserNameOffset,                               { TAPI v2.0 }
    dwModuleFilenameSize,                           { TAPI v2.0 }
    dwModuleFilenameOffset,                         { TAPI v2.0 }
    dwFriendlyNameSize,                             { TAPI v2.0 }
    dwFriendlyNameOffset,                           { TAPI v2.0 }
    dwMediaModes,                                   { TAPI v2.0 }
    dwAddressID: Longint;                           { TAPI v2.0 }
  end;
{$ENDIF}

  LPLineDialParams = ^TLineDialParams;
  TLineDialParams = record
    dwDialPause,
    dwDialSpeed,
    dwDigitDuration,