diff --git a/libs/freetdm/msvc/openzap.vcproj b/libs/freetdm/msvc/openzap.vcproj
index f677bc216b..33776e109c 100644
--- a/libs/freetdm/msvc/openzap.vcproj
+++ b/libs/freetdm/msvc/openzap.vcproj
@@ -41,7 +41,7 @@
 			<Tool
 				Name="VCCLCompilerTool"
 				Optimization="0"
-				AdditionalIncludeDirectories="../src/include;../src/isdn/include;../src/dsp"
+				AdditionalIncludeDirectories="../src/include;../src/isdn/include"
 				PreprocessorDefinitions="WIN32;_DEBUG;_LIB"
 				MinimalRebuild="true"
 				BasicRuntimeChecks="3"
@@ -109,7 +109,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
-				AdditionalIncludeDirectories="../src/include;../src/isdn/include;../src/dsp"
+				AdditionalIncludeDirectories="../src/include;../src/isdn/include"
 				PreprocessorDefinitions="WIN32;NDEBUG;_LIB"
 				RuntimeLibrary="2"
 				DisableLanguageExtensions="false"
@@ -324,6 +324,7 @@
 					>
 					<FileConfiguration
 						Name="Debug|Win32"
+						ExcludedFromBuild="true"
 						>
 						<Tool
 							Name="VCCLCompilerTool"
@@ -332,6 +333,7 @@
 					</FileConfiguration>
 					<FileConfiguration
 						Name="Release|Win32"
+						ExcludedFromBuild="true"
 						>
 						<Tool
 							Name="VCCLCompilerTool"
@@ -369,6 +371,10 @@
 				Filter="cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx"
 				UniqueIdentifier="{4FC737F1-C7A5-4376-A066-2A32D752A2FF}"
 				>
+				<File
+					RelativePath="..\src\fsk.c"
+					>
+				</File>
 				<File
 					RelativePath="..\src\g711.c"
 					>
@@ -389,6 +395,10 @@
 					RelativePath="..\src\libteletone_generate.c"
 					>
 				</File>
+				<File
+					RelativePath="..\src\uart.c"
+					>
+				</File>
 				<File
 					RelativePath="..\src\zap_buffer.c"
 					>
@@ -411,6 +421,10 @@
 				Filter="h;hpp;hxx;hm;inl;inc;xsd"
 				UniqueIdentifier="{93995380-89BD-4b04-88EB-625FBE52EBFB}"
 				>
+				<File
+					RelativePath="..\src\include\fsk.h"
+					>
+				</File>
 				<File
 					RelativePath="..\src\include\g711.h"
 					>
@@ -443,6 +457,10 @@
 					RelativePath="..\src\include\openzap.h"
 					>
 				</File>
+				<File
+					RelativePath="..\src\include\uart.h"
+					>
+				</File>
 				<File
 					RelativePath="..\src\include\zap_buffer.h"
 					>
@@ -461,38 +479,6 @@
 				</File>
 			</Filter>
 		</Filter>
-		<Filter
-			Name="Dsp"
-			>
-			<File
-				RelativePath="..\src\dsp\readme.txt"
-				>
-			</File>
-			<Filter
-				Name="Header Files"
-				>
-				<File
-					RelativePath="..\src\dsp\fsk.h"
-					>
-				</File>
-				<File
-					RelativePath="..\src\dsp\uart.h"
-					>
-				</File>
-			</Filter>
-			<Filter
-				Name="Source Files"
-				>
-				<File
-					RelativePath="..\src\dsp\fsk.c"
-					>
-				</File>
-				<File
-					RelativePath="..\src\dsp\uart.c"
-					>
-				</File>
-			</Filter>
-		</Filter>
 	</Files>
 	<Globals>
 	</Globals>
diff --git a/libs/freetdm/openzap.sln b/libs/freetdm/openzap.sln
index ab53115d35..2e05fb4136 100644
--- a/libs/freetdm/openzap.sln
+++ b/libs/freetdm/openzap.sln
@@ -7,8 +7,6 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Unix Makefiles", "Unix Make
 	ProjectSection(SolutionItems) = preProject
 		general.makefile = general.makefile
 		Makefile = Makefile
-		wanpipe = wanpipe
-		zt = zt
 	EndProjectSection
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testanalog", "msvc\testanalog\testanalog.vcproj", "{BB833648-BAFF-4BE2-94DB-F8BB043C588C}"
diff --git a/libs/freetdm/src/zap_io.c b/libs/freetdm/src/zap_io.c
index 6f6bdb6940..9c251c9c42 100644
--- a/libs/freetdm/src/zap_io.c
+++ b/libs/freetdm/src/zap_io.c
@@ -31,7 +31,9 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef WIN32
 #define ZAP_ZT_SUPPORT
+#endif
 #define ZAP_WANPIPE_SUPPORT
 #include "openzap.h"
 #include "zap_isdn.h"