diff --git a/libs/spandsp/src/libspandsp.2010.vcxproj b/libs/spandsp/src/libspandsp.2010.vcxproj
index bb2ae97878..393a1b6d45 100644
--- a/libs/spandsp/src/libspandsp.2010.vcxproj
+++ b/libs/spandsp/src/libspandsp.2010.vcxproj
@@ -155,6 +155,7 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="ademco_contactid.c" />
     <ClCompile Include="adsi.c" />
     <ClCompile Include="async.c" />
     <ClCompile Include="at_interpreter.c" />
@@ -239,6 +240,7 @@
     <ClCompile Include="msvc\gettimeofday.c" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="spandsp\ademco_contactid.h" />
     <ClInclude Include="spandsp\adsi.h" />
     <ClInclude Include="spandsp\async.h" />
     <ClInclude Include="spandsp\arctan2.h" />
@@ -279,6 +281,7 @@
     <ClInclude Include="spandsp\playout.h" />
     <ClInclude Include="spandsp\plc.h" />
     <ClInclude Include="spandsp\power_meter.h" />
+    <ClInclude Include="spandsp\private\ademco_contactid.h" />
     <ClInclude Include="spandsp\queue.h" />
     <ClInclude Include="spandsp\saturated.h" />
     <ClInclude Include="spandsp\schedule.h" />
diff --git a/libs/spandsp/src/libspandsp.2010.vcxproj.filters b/libs/spandsp/src/libspandsp.2010.vcxproj.filters
index 2a6d60a9d4..c75936a851 100644
--- a/libs/spandsp/src/libspandsp.2010.vcxproj.filters
+++ b/libs/spandsp/src/libspandsp.2010.vcxproj.filters
@@ -253,6 +253,12 @@
     <ClCompile Include="msvc\gettimeofday.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="timezone.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="ademco_contactid.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="spandsp\adsi.h">
@@ -660,6 +666,14 @@
     <ClInclude Include="spandsp.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="spandsp\t4_t6_decode.h" />
+    <ClInclude Include="spandsp\t4_t6_encode.h" />
+    <ClInclude Include="spandsp\ademco_contactid.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="spandsp\private\ademco_contactid.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <CustomBuild Include="msvc\spandsp.h" />
diff --git a/libs/spandsp/src/msvc/spandsp.h b/libs/spandsp/src/msvc/spandsp.h
index 95ee8bf11b..ba0bc280d6 100644
--- a/libs/spandsp/src/msvc/spandsp.h
+++ b/libs/spandsp/src/msvc/spandsp.h
@@ -118,6 +118,7 @@
 #include <spandsp/t38_terminal.h>
 #include <spandsp/t31.h>
 #include <spandsp/adsi.h>
+#include <spandsp/ademco_contactid.h>
 #include <spandsp/oki_adpcm.h>
 #include <spandsp/ima_adpcm.h>
 #include <spandsp/g722.h>