diff --git a/windows/YATE.dsw b/windows/YATE.dsw
index 1a25f7f9..862035cf 100644
--- a/windows/YATE.dsw
+++ b/windows/YATE.dsw
@@ -176,6 +176,9 @@ Package=<4>
     Begin Project Dependency
     Project_Dep_Name _accfile
     End Project Dependency
+    Begin Project Dependency
+    Project_Dep_Name _ilbccodec
+    End Project Dependency
 }}}
 
 ###############################################################################
@@ -360,6 +363,24 @@ Package=<4>
 
 ###############################################################################
 
+Project: "_ilbccodec"=.\_ilbccodec.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+    Begin Project Dependency
+    Project_Dep_Name libilbc
+    End Project Dependency
+    Begin Project Dependency
+    Project_Dep_Name Libyate
+    End Project Dependency
+}}}
+
+###############################################################################
+
 Project: "_msgsniff"=.\_msgsniff.dsp - Package Owner=<4>
 
 Package=<5>
@@ -516,6 +537,18 @@ Package=<4>
 
 ###############################################################################
 
+Project: "libilbc"=.\libilbc.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+}}}
+
+###############################################################################
+
 Project: "libregex"=.\libregex.dsp - Package Owner=<4>
 
 Package=<5>
diff --git a/windows/_ilbccodec.dsp b/windows/_ilbccodec.dsp
new file mode 100644
index 00000000..d616402a
--- /dev/null
+++ b/windows/_ilbccodec.dsp
@@ -0,0 +1,114 @@
+# Microsoft Developer Studio Project File - Name="_ilbccodec" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
+
+CFG=_ilbccodec - Win32 Debug
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "_ilbccodec.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "_ilbccodec.mak" CFG="_ilbccodec - Win32 Debug"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "_ilbccodec - Win32 Release" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "_ilbccodec - Win32 Debug" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+MTL=midl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "_ilbccodec - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "Release"
+# PROP Intermediate_Dir "Release\modules"
+# PROP Ignore_Export_Lib 1
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /D "_USRDLL" /D "_ILBCCODEC_EXPORTS" /YX /FD /c
+# ADD CPP /nologo /MD /W3 /O2 /I "." /I ".." /I "..\contrib\ilbc" /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "_MBCS" /D "_USRDLL" /FD /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /dll /machine:I386
+# ADD LINK32 kernel32.lib /nologo /dll /machine:I386 /out:"Release/ilbccodec.yate"
+# SUBTRACT LINK32 /incremental:yes
+
+!ELSEIF  "$(CFG)" == "_ilbccodec - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "Debug"
+# PROP Intermediate_Dir "Debug\modules"
+# PROP Ignore_Export_Lib 1
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /MTd /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /D "_USRDLL" /D "_ILBCCODEC_EXPORTS" /YX /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Gm /Zi /Od /I "." /I ".." /I "..\contrib\ilbc" /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "_MBCS" /D "_USRDLL" /FD /GZ /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /dll /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 kernel32.lib /nologo /dll /incremental:no /debug /machine:I386 /out:"Debug/ilbccodec.yate" /pdbtype:sept
+
+!ENDIF 
+
+# Begin Target
+
+# Name "_ilbccodec - Win32 Release"
+# Name "_ilbccodec - Win32 Debug"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=..\modules\ilbccodec.cpp
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# End Group
+# Begin Group "Resource Files"
+
+# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+# Begin Source File
+
+SOURCE=.\version.rc
+# End Source File
+# End Group
+# End Target
+# End Project
diff --git a/windows/libilbc.dsp b/windows/libilbc.dsp
new file mode 100644
index 00000000..38e5886e
--- /dev/null
+++ b/windows/libilbc.dsp
@@ -0,0 +1,282 @@
+# Microsoft Developer Studio Project File - Name="libilbc" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Static Library" 0x0104
+
+CFG=libilbc - Win32 Debug
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "libilbc.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "libilbc.mak" CFG="libilbc - Win32 Debug"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "libilbc - Win32 Release" (based on "Win32 (x86) Static Library")
+!MESSAGE "libilbc - Win32 Debug" (based on "Win32 (x86) Static Library")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "libilbc - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "Release"
+# PROP Intermediate_Dir "Release\ilbc"
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_MBCS" /D "_LIB" /YX /FD /c
+# ADD CPP /nologo /MD /W3 /O2 /I "." /I ".." /I "..\contrib\ilbc" /D "WIN32" /D "NDEBUG" /D "_MBCS" /D "_LIB" /FD /c
+# SUBTRACT CPP /YX
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ELSEIF  "$(CFG)" == "libilbc - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "Debug"
+# PROP Intermediate_Dir "Debug\ilbc"
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_MBCS" /D "_LIB" /YX /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /I "." /I ".." /I "..\contrib\ilbc" /D "WIN32" /D "_DEBUG" /D "_MBCS" /D "_LIB" /FD /GZ /c
+# SUBTRACT CPP /YX
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ENDIF 
+
+# Begin Target
+
+# Name "libilbc - Win32 Release"
+# Name "libilbc - Win32 Debug"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\anaFilter.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\constants.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\createCB.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\doCPLC.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\enhancer.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\filter.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\FrameClassify.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\gainquant.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\getCBvec.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\helpfun.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\hpInput.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\hpOutput.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\iCBConstruct.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\iCBSearch.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\iLBC_decode.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\iLBC_encode.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\LPCdecode.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\LPCencode.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\lsf.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\packing.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\StateConstructW.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\StateSearchW.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\syntFilter.c
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\anaFilter.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\constants.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\createCB.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\doCPLC.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\enhancer.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\filter.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\FrameClassify.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\gainquant.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\getCBvec.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\helpfun.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\hpInput.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\hpOutput.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\iCBConstruct.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\iCBSearch.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\iLBC_decode.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\iLBC_define.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\iLBC_encode.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\LPCdecode.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\LPCencode.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\lsf.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\packing.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\StateConstructW.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\StateSearchW.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\contrib\ilbc\syntFilter.h
+# End Source File
+# End Group
+# End Target
+# End Project
diff --git a/windows/yate.iss b/windows/yate.iss
index 3905140b..6c784538 100644
--- a/windows/yate.iss
+++ b/windows/yate.iss
@@ -34,6 +34,8 @@ Name: "driver\sip"; Description: "SIP Protocol driver"; Types: full client serve
 Name: "driver\h323"; Description: "H.323 Protocol driver"; Types: full client server
 Name: "driver\iax"; Description: "IAX Protocol driver"; Types: full client server
 Name: "driver\wp"; Description: "Wanpipe card driver"; Types: full server
+Name: "codecs"; Description: "Format codecs"; Types: full client server
+Name: "codecs\ilbc"; Description: "iLBC codec"; Types: full client server
 Name: "debug"; Description: "Extra debugging support"; Types: full engine
 
 [Tasks]
@@ -67,6 +69,7 @@ Source: "Release\h323chan.yate"; DestDir: "{app}\modules"; Components: driver\h3
 Source: "Runtimes\ptlib.dll"; DestDir: "{app}"; Components: driver\h323
 Source: "Runtimes\openh323.dll"; DestDir: "{app}"; Components: driver\h323
 Source: "Release\iaxchan.yate"; DestDir: "{app}\modules"; Components: driver\iax
+Source: "Release\ilbccodec.yate"; DestDir: "{app}\modules"; Components: codecs\ilbc
 
 Source: "null_team.ico"; DestDir: "{app}"
 Source: "..\conf.d\*.conf.sample"; DestDir: "{app}\conf.d"