diff --git a/Freeswitch.2015.sln b/Freeswitch.2015.sln
index 269f87731d..e347bda003 100644
--- a/Freeswitch.2015.sln
+++ b/Freeswitch.2015.sln
@@ -583,19 +583,11 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libyuv", "libs\win32\libyuv
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libvpx", "libs\win32\libvpx\libvpx.2015.vcxproj", "{DCE19DAF-69AC-46DB-B14A-39F0FAA5DB74}"
 EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlib", "libs\win32\zlib\zlib.vcxproj", "{60F89955-91C6-3A36-8000-13C592FEC2DF}"
-	ProjectSection(ProjectDependencies) = postProject
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311} = {CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}
-	EndProjectSection
-EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libpng", "libs\win32\libpng\libpng.vcxproj", "{D6973076-9317-4EF2-A0B8-B7A18AC0713E}"
 	ProjectSection(ProjectDependencies) = postProject
-		{60F89955-91C6-3A36-8000-13C592FEC2DF} = {60F89955-91C6-3A36-8000-13C592FEC2DF}
 		{C2D5EB6D-F4DE-4DEE-B5B8-B6FD26C22D33} = {C2D5EB6D-F4DE-4DEE-B5B8-B6FD26C22D33}
 	EndProjectSection
 EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Download zlib", "libs\win32\Download zlib.2015.vcxproj", "{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}"
-EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Download libpng", "libs\win32\Download libpng.2015.vcxproj", "{C2D5EB6D-F4DE-4DEE-B5B8-B6FD26C22D33}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "freetype", "libs\win32\freetype\freetype.vcxproj", "{78B079BD-9FC7-4B9E-B4A6-96DA0F00248B}"
@@ -2682,18 +2674,6 @@ Global
 		{DCE19DAF-69AC-46DB-B14A-39F0FAA5DB74}.Release|Win32.Build.0 = Release|Win32
 		{DCE19DAF-69AC-46DB-B14A-39F0FAA5DB74}.Release|x64.ActiveCfg = Release|x64
 		{DCE19DAF-69AC-46DB-B14A-39F0FAA5DB74}.Release|x64.Build.0 = Release|x64
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.All|Win32.ActiveCfg = Release|Win32
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.All|Win32.Build.0 = Release|Win32
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.All|x64.ActiveCfg = Release|x64
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.All|x64.Build.0 = Release|x64
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug|Win32.ActiveCfg = Debug|Win32
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug|Win32.Build.0 = Debug|Win32
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug|x64.ActiveCfg = Debug|x64
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug|x64.Build.0 = Debug|x64
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Release|Win32.ActiveCfg = Release|Win32
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Release|Win32.Build.0 = Release|Win32
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Release|x64.ActiveCfg = Release|x64
-		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Release|x64.Build.0 = Release|x64
 		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.All|Win32.ActiveCfg = Release|Win32
 		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.All|Win32.Build.0 = Release|Win32
 		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.All|x64.ActiveCfg = Release|x64
@@ -2706,18 +2686,6 @@ Global
 		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Release|Win32.Build.0 = Release|Win32
 		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Release|x64.ActiveCfg = Release|x64
 		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Release|x64.Build.0 = Release|x64
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.All|Win32.ActiveCfg = Release|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.All|Win32.Build.0 = Release|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.All|x64.ActiveCfg = Release|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.All|x64.Build.0 = Release|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.Debug|Win32.ActiveCfg = Debug|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.Debug|Win32.Build.0 = Debug|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.Debug|x64.ActiveCfg = Debug|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.Debug|x64.Build.0 = Debug|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.Release|Win32.ActiveCfg = Release|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.Release|Win32.Build.0 = Release|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.Release|x64.ActiveCfg = Release|Win32
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}.Release|x64.Build.0 = Release|Win32
 		{C2D5EB6D-F4DE-4DEE-B5B8-B6FD26C22D33}.All|Win32.ActiveCfg = Release|Win32
 		{C2D5EB6D-F4DE-4DEE-B5B8-B6FD26C22D33}.All|Win32.Build.0 = Release|Win32
 		{C2D5EB6D-F4DE-4DEE-B5B8-B6FD26C22D33}.All|x64.ActiveCfg = Release|Win32
@@ -3147,9 +3115,7 @@ Global
 		{5B2BACE4-0F5A-4A21-930D-C0F4B1F58FA6} = {9460B5F1-0A95-41C4-BEB7-9C2C96459A7C}
 		{B6E22500-3DB6-4E6E-8CD5-591B781D7D99} = {EB910B0D-F27D-4B62-B67B-DE834C99AC5B}
 		{DCE19DAF-69AC-46DB-B14A-39F0FAA5DB74} = {EB910B0D-F27D-4B62-B67B-DE834C99AC5B}
-		{60F89955-91C6-3A36-8000-13C592FEC2DF} = {EB910B0D-F27D-4B62-B67B-DE834C99AC5B}
 		{D6973076-9317-4EF2-A0B8-B7A18AC0713E} = {EB910B0D-F27D-4B62-B67B-DE834C99AC5B}
-		{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311} = {C120A020-773F-4EA3-923F-B67AF28B750D}
 		{C2D5EB6D-F4DE-4DEE-B5B8-B6FD26C22D33} = {C120A020-773F-4EA3-923F-B67AF28B750D}
 		{78B079BD-9FC7-4B9E-B4A6-96DA0F00248B} = {EB910B0D-F27D-4B62-B67B-DE834C99AC5B}
 		{0AD87FDA-989F-4638-B6E1-B0132BB0560A} = {C120A020-773F-4EA3-923F-B67AF28B750D}
diff --git a/libs/.gitignore b/libs/.gitignore
index 450b313e42..670c2438b3 100644
--- a/libs/.gitignore
+++ b/libs/.gitignore
@@ -842,3 +842,5 @@ spandsp/configure
 srtp/configure
 tiff-4.0.2/configure
 unimrcp/configure
+zlib-*/
+zlib-*
diff --git a/libs/win32/Download zlib.2015.vcxproj b/libs/win32/Download zlib.2015.vcxproj
deleted file mode 100644
index d0e044de79..0000000000
--- a/libs/win32/Download zlib.2015.vcxproj	
+++ /dev/null
@@ -1,82 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <ItemGroup Label="ProjectConfigurations">
-    <ProjectConfiguration Include="Debug|Win32">
-      <Configuration>Debug</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|Win32">
-      <Configuration>Release</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-  </ItemGroup>
-  <PropertyGroup Label="Globals">
-    <ProjectName>Download zlib</ProjectName>
-    <ProjectGuid>{CDCEC78E-D445-47AC-A2AE-DEBE2CE3A311}</ProjectGuid>
-    <RootNamespace>Download zlib</RootNamespace>
-    <Keyword>Win32Proj</Keyword>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>Utility</ConfigurationType>
-    <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>Utility</ConfigurationType>
-    <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
-  <Import Project="$(SolutionDir)\w32\extlib.props" />
-  <ImportGroup Label="ExtensionSettings">
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="..\..\w32\zlib.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="..\..\w32\zlib.props" />
-  </ImportGroup>
-  <PropertyGroup Label="UserMacros" />
-  <PropertyGroup>
-    <_ProjectFileVersion>10.0.30319.1</_ProjectFileVersion>
-    <IntDir Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">$(PlatformName)\zlib\$(Configuration)\</IntDir>
-    <IntDir Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(PlatformName)\zlib\$(Configuration)\</IntDir>
-  </PropertyGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <BuildLog>
-      <Path>$(IntDir)BuildLog $(ProjectName).htm</Path>
-    </BuildLog>
-    <PreBuildEvent>
-      <Command>
-      </Command>
-    </PreBuildEvent>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
-    <BuildLog>
-      <Path>$(IntDir)BuildLog $(ProjectName).htm</Path>
-    </BuildLog>
-    <PreBuildEvent>
-      <Command>
-      </Command>
-    </PreBuildEvent>
-  </ItemDefinitionGroup>
-  <ItemGroup>
-    <CustomBuild Include="cleancount">
-      <FileType>Document</FileType>
-      <Message Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">Downloading zlib.</Message>
-      <Command Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">if not exist "$(ProjectDir)..\zlib" cscript /nologo "$(ProjectDir)util.vbs" GetUnzip http://files.freeswitch.org/downloads/libs/zlib.tar.bz2 "$(ProjectDir).."
-</Command>
-      <Outputs Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">$(ProjectDir)..\zlib;%(Outputs)</Outputs>
-      <Message Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">Downloading zlib.</Message>
-      <Command Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">if not exist "$(ProjectDir)..\zlib" cscript /nologo "$(ProjectDir)util.vbs" GetUnzip http://files.freeswitch.org/downloads/libs/zlib.tar.bz2 "$(ProjectDir).."
-</Command>
-      <Outputs Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(ProjectDir)..\zlib;%(Outputs)</Outputs>
-    </CustomBuild>
-  </ItemGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
-  <ImportGroup Label="ExtensionTargets">
-  </ImportGroup>
-</Project>
\ No newline at end of file
diff --git a/libs/win32/libpng/libpng.vcxproj b/libs/win32/libpng/libpng.vcxproj
index a6a66f1e00..0fcf409fab 100644
--- a/libs/win32/libpng/libpng.vcxproj
+++ b/libs/win32/libpng/libpng.vcxproj
@@ -100,7 +100,6 @@
       <CompileAs>CompileAsC</CompileAs>
       <StringPooling>true</StringPooling>
       <DisableSpecificWarnings>$(DisableSpecificWarnings)</DisableSpecificWarnings>
-      <AdditionalIncludeDirectories>$(ZLibSrcDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <TreatWarningAsError>$(TreatWarningAsError)</TreatWarningAsError>
       <Optimization>Disabled</Optimization>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
@@ -108,9 +107,7 @@
     <Link>
       <SubSystem>Windows</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>zlib.lib</AdditionalDependencies>
       <Version>16</Version>
-      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
@@ -129,18 +126,15 @@
       <StringPooling>true</StringPooling>
       <MinimalRebuild>false</MinimalRebuild>
       <DisableSpecificWarnings>$(DisableSpecificWarnings)</DisableSpecificWarnings>
-      <AdditionalIncludeDirectories>$(ZLibSrcDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <TreatWarningAsError>$(TreatWarningAsError)</TreatWarningAsError>
       <Optimization>Full</Optimization>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <GenerateDebugInformation>false</GenerateDebugInformation>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
-      <AdditionalDependencies>zlib.lib</AdditionalDependencies>
       <Version>16</Version>
-      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
@@ -163,7 +157,6 @@
       <CompileAs>CompileAsC</CompileAs>
       <StringPooling>true</StringPooling>
       <DisableSpecificWarnings>$(DisableSpecificWarnings)</DisableSpecificWarnings>
-      <AdditionalIncludeDirectories>$(ZLibSrcDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <TreatWarningAsError>$(TreatWarningAsError)</TreatWarningAsError>
       <Optimization>Disabled</Optimization>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
@@ -171,9 +164,7 @@
     <Link>
       <SubSystem>Windows</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>zlib.lib</AdditionalDependencies>
       <Version>16</Version>
-      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
@@ -195,18 +186,15 @@
       <StringPooling>true</StringPooling>
       <MinimalRebuild>false</MinimalRebuild>
       <DisableSpecificWarnings>$(DisableSpecificWarnings)</DisableSpecificWarnings>
-      <AdditionalIncludeDirectories>$(ZLibSrcDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <TreatWarningAsError>$(TreatWarningAsError)</TreatWarningAsError>
       <Optimization>Full</Optimization>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <GenerateDebugInformation>false</GenerateDebugInformation>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
-      <AdditionalDependencies>zlib.lib</AdditionalDependencies>
       <Version>16</Version>
-      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
@@ -245,9 +233,6 @@
     <ProjectReference Include="..\Download libpng.2015.vcxproj">
       <Project>{c2d5eb6d-f4de-4dee-b5b8-b6fd26c22d33}</Project>
     </ProjectReference>
-    <ProjectReference Include="..\zlib\zlib.vcxproj">
-      <Project>{60f89955-91c6-3a36-8000-13c592fec2df}</Project>
-    </ProjectReference>
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
diff --git a/libs/win32/zlib/zlib.vcxproj b/libs/win32/zlib/zlib.vcxproj
deleted file mode 100644
index ec44043925..0000000000
--- a/libs/win32/zlib/zlib.vcxproj
+++ /dev/null
@@ -1,188 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <ItemGroup Label="ProjectConfigurations">
-    <ProjectConfiguration Include="Debug|Win32">
-      <Configuration>Debug</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|x64">
-      <Configuration>Debug</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|Win32">
-      <Configuration>Release</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|x64">
-      <Configuration>Release</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-  </ItemGroup>
-  <ItemGroup>
-    <ClCompile Include="..\..\zlib\adler32.c" />
-    <ClCompile Include="..\..\zlib\compress.c" />
-    <ClCompile Include="..\..\zlib\crc32.c" />
-    <ClCompile Include="..\..\zlib\deflate.c" />
-    <ClCompile Include="..\..\zlib\infback.c" />
-    <ClCompile Include="..\..\zlib\inffast.c" />
-    <ClCompile Include="..\..\zlib\inflate.c" />
-    <ClCompile Include="..\..\zlib\inftrees.c" />
-    <ClCompile Include="..\..\zlib\trees.c" />
-    <ClCompile Include="..\..\zlib\uncompr.c" />
-    <ClCompile Include="..\..\zlib\zutil.c" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\Download zlib.2015.vcxproj">
-      <Project>{cdcec78e-d445-47ac-a2ae-debe2ce3a311}</Project>
-    </ProjectReference>
-  </ItemGroup>
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>{60F89955-91C6-3A36-8000-13C592FEC2DF}</ProjectGuid>
-    <Keyword>Win32Proj</Keyword>
-    <RootNamespace>zlib</RootNamespace>
-  </PropertyGroup>
-  <Import Project="$(ProjectDir)..\..\..\w32\zlib.props" />
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <PlatformToolset>v140</PlatformToolset>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <PlatformToolset>v140</PlatformToolset>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='release|x64'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <PlatformToolset>v140</PlatformToolset>
-    <WholeProgramOptimization>false</WholeProgramOptimization>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='debug|x64'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <PlatformToolset>v140</PlatformToolset>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
-  <ImportGroup Label="ExtensionSettings">
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='release|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="..\..\..\w32\extdll.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='debug|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="..\..\..\w32\extdll.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='release|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="..\..\..\w32\extdll.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='debug|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="..\..\..\w32\extdll.props" />
-  </ImportGroup>
-  <PropertyGroup Label="UserMacros" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <LinkIncremental>true</LinkIncremental>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
-    <LinkIncremental>true</LinkIncremental>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
-    <LinkIncremental>true</LinkIncremental>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
-    <LinkIncremental>true</LinkIncremental>
-  </PropertyGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <ClCompile>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;Z_SOLO;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <WarningLevel>$(WarningLevel)</WarningLevel>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <Optimization>Disabled</Optimization>
-      <BrowseInformation>true</BrowseInformation>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <DisableSpecificWarnings>$(DisableSpecificWarnings);4127;4131;4242;4244</DisableSpecificWarnings>
-      <TreatWarningAsError>$(TreatWarningAsError)</TreatWarningAsError>
-      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
-    </ClCompile>
-    <Link>
-      <TargetMachine>MachineX86</TargetMachine>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <SubSystem>Windows</SubSystem>
-    </Link>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
-    <ClCompile>
-      <WarningLevel>$(WarningLevel)</WarningLevel>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <Optimization>Full</Optimization>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <WholeProgramOptimization>true</WholeProgramOptimization>
-      <BufferSecurityCheck>false</BufferSecurityCheck>
-      <BrowseInformation>true</BrowseInformation>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <DisableSpecificWarnings>$(DisableSpecificWarnings);4127;4131;4242;4244</DisableSpecificWarnings>
-      <TreatWarningAsError>$(TreatWarningAsError)</TreatWarningAsError>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;Z_SOLO;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-    </ClCompile>
-    <Link>
-      <TargetMachine>MachineX86</TargetMachine>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <SubSystem>Windows</SubSystem>
-      <EnableCOMDATFolding>true</EnableCOMDATFolding>
-      <OptimizeReferences>true</OptimizeReferences>
-    </Link>
-    <Lib>
-      <LinkTimeCodeGeneration>true</LinkTimeCodeGeneration>
-    </Lib>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
-    <Midl>
-      <TargetEnvironment>X64</TargetEnvironment>
-    </Midl>
-    <ClCompile>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;Z_SOLO;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <WarningLevel>$(WarningLevel)</WarningLevel>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <Optimization>Disabled</Optimization>
-      <BrowseInformation>true</BrowseInformation>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <DisableSpecificWarnings>$(DisableSpecificWarnings);4127;4131;4242;4244</DisableSpecificWarnings>
-      <TreatWarningAsError>$(TreatWarningAsError)</TreatWarningAsError>
-      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
-    </ClCompile>
-    <Link>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <SubSystem>Windows</SubSystem>
-    </Link>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
-    <Midl>
-      <TargetEnvironment>X64</TargetEnvironment>
-    </Midl>
-    <ClCompile>
-      <WarningLevel>$(WarningLevel)</WarningLevel>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <Optimization>Full</Optimization>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <WholeProgramOptimization>true</WholeProgramOptimization>
-      <BufferSecurityCheck>false</BufferSecurityCheck>
-      <BrowseInformation>true</BrowseInformation>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <DisableSpecificWarnings>$(DisableSpecificWarnings);4127;4131;4242;4244</DisableSpecificWarnings>
-      <TreatWarningAsError>$(TreatWarningAsError)</TreatWarningAsError>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;Z_SOLO;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-    </ClCompile>
-    <Link>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <SubSystem>Windows</SubSystem>
-      <EnableCOMDATFolding>true</EnableCOMDATFolding>
-      <OptimizeReferences>true</OptimizeReferences>
-    </Link>
-    <Lib>
-      <LinkTimeCodeGeneration>true</LinkTimeCodeGeneration>
-    </Lib>
-  </ItemDefinitionGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
-  <ImportGroup Label="ExtensionTargets">
-  </ImportGroup>
-</Project>
\ No newline at end of file
diff --git a/w32/zlib-version.props b/w32/zlib-version.props
new file mode 100644
index 0000000000..48ad7072af
--- /dev/null
+++ b/w32/zlib-version.props
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ImportGroup Label="PropertySheets">
+    <Import Project="basedir.props" Condition=" '$(BaseDirImported)' == ''"/>
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros">
+    <zlibVersion>1.2.11</zlibVersion>
+  </PropertyGroup>
+  <PropertyGroup>
+    <zlibVersionImported>true</zlibVersionImported>
+  </PropertyGroup>
+  <PropertyGroup />
+  <ItemDefinitionGroup />
+  <ItemGroup>
+    <BuildMacro Include="zlibVersion">
+      <Value>$(zlibVersion)</Value>
+    </BuildMacro>
+  </ItemGroup>
+</Project>
diff --git a/w32/zlib.props b/w32/zlib.props
index 9f152a267b..af8292a2c4 100644
--- a/w32/zlib.props
+++ b/w32/zlib.props
@@ -1,64 +1,61 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!--
- * zlib.props - location of zlib source
- *
- * libpng version 1.6.28 - January 5, 2017
- *
- * Copyright (c) 1998-2011 Glenn Randers-Pehrson
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ImportGroup Label="PropertySheets">
+    <Import Project="zlib-version.props" Condition=" '$(zlibVersionImported)' == '' "/>
+    <Import Project="downloadpackage.task" Condition=" '$(downloadpackagetask_Imported)' == '' " />
+  </ImportGroup>
 
- * You must edit this file to record the location of the zlib
- * source code.
- -->
-
-<Project ToolsVersion="4.0"
-   xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup Label="Globals">
-    <!-- Place the name of the directory containing the source of zlib used for
-	 debugging in this property.
-
-         The directory need only contain the '.c' and '.h' files from the
-	 source.
-
-	 If you use a relative directory name (as below) then it must be
-	 relative to the project directories; these are one level deeper than
-	 the directories containing this file.
-
-	 If the version of zlib you use does not match that used when the
-	 distribution was built you will get warnings from pngtest that the zlib
-	 versions do not match.  The zlib version used in this build is recorded
-	 below:
-     -->
-    <ZLibSrcDir>$(SolutionDir)libs\zlib</ZLibSrcDir>
-
-    <!-- The following line allows compilation for an ARM target with Visual
-         Studio 2012.  Notice that this is not supported by the Visual Studio
-         2012 IDE and that the programs that result cannot be run unless they
-         signed by Microsoft.  This is therefore untested; only Microsoft can
-         test it:
-     -->
-    <WindowsSDKDesktopARMSupport>true</WindowsSDKDesktopARMSupport>
-
-    <!-- The following lines provide a global (solution level) control of the
-         warnings issued by the compiler, these are used in the individual
-         project files (*/*.vcxproj) with, for zlib, some extra disables.
-
-         Different versions of Visual Studio may require different settings,
-         these settings work with Visual Studio 2013.  Just set
-         TreatWarningAsError to false to check the build without failing on
-         errors.
-     -->
-   <WarningLevel>EnableAllWarnings</WarningLevel>
-   <TreatWarningAsError>true</TreatWarningAsError>
-   <DisableSpecificWarnings>4255;4668;4710;4711;4746;4820;4996</DisableSpecificWarnings>
+  <PropertyGroup Label="UserMacros">
+    <zliblibDir>$(BaseDir)libs\zlib-$(zlibVersion)</zliblibDir>
   </PropertyGroup>
+
+  <!-- 
+       Download Target.
+       Name must be unique. 
+       By design, targets are executed only once per project.
+       
+       Usage:
+       
+       package: URI
+
+       expectfileordirectory: Skips the download and extraction if exists
+
+       outputfolder: Folder to store a downloaded file. 
+                     By default "$(BaseDir)libs", if empty
+
+       outputfilename: If not empty, overrides filename from URI.
+                       .exe files don't get extracted
+
+       extractto: Folder to extract an archive to
+   -->
+
+  <Target Name="zlibBinariesDownloadTarget" BeforeTargets="CustomBuild" DependsOnTargets="7za">  
+      <DownloadPackageTask 
+           package="http://files.freeswitch.org/windows/packages/zlib/$(zlibVersion)/zlib-$(zlibVersion)-binaries-$(Platform.ToLower())-$(Configuration.ToLower()).zip"
+           expectfileordirectory="$(zliblibDir)\binaries\$(Platform)\$(Configuration)\zlib.lib" 
+           outputfolder=""
+           outputfilename="" 
+           extractto="$(BaseDir)libs\"
+      />
+  </Target> 
+  <Target Name="zlibHeadersDownloadTarget" BeforeTargets="CustomBuild" DependsOnTargets="7za">  
+      <DownloadPackageTask 
+           package="http://files.freeswitch.org/windows/packages/zlib/$(zlibVersion)/zlib-$(zlibVersion)-headers.zip"
+           expectfileordirectory="$(zliblibDir)\include\zlib.h" 
+           outputfolder=""
+           outputfilename="" 
+           extractto="$(BaseDir)libs\"
+      />
+  </Target> 
+
   <ItemDefinitionGroup>
     <ClCompile>
-      <AdditionalIncludeDirectories>$(SolutionDir)libs\zlib;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(SolutionDir)libs\zlib-$(zlibVersion)\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>HAVE_ZLIB;ZLIB_STATICLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
+    <Link>
+      <AdditionalLibraryDirectories>$(SolutionDir)libs\zlib-$(zlibVersion)\binaries\$(Platform)\$(Configuration);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
+      <AdditionalDependencies>zlib.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
   </ItemDefinitionGroup>
 </Project>
\ No newline at end of file