diff --git a/src/BeSimple/SoapClient/SoapClient.php b/src/BeSimple/SoapClient/SoapClient.php
index 90d8f1d..afa6515 100644
--- a/src/BeSimple/SoapClient/SoapClient.php
+++ b/src/BeSimple/SoapClient/SoapClient.php
@@ -277,6 +277,8 @@ class SoapClient extends \SoapClient
                 $converter = new SwaTypeConverter();
                 $converter->setKernel($this->soapKernel);
             } elseif (Helper::ATTACHMENTS_TYPE_MTOM === $options['attachment_type']) {
+                $xmlMimeFilter = new XmlMimeFilter($options['attachment_type']);
+                $this->soapKernel->registerFilter($xmlMimeFilter);
                 $converter = new MtomTypeConverter();
                 $converter->setKernel($this->soapKernel);
             }
diff --git a/src/BeSimple/SoapClient/XmlMimeFilter.php b/src/BeSimple/SoapClient/XmlMimeFilter.php
new file mode 100644
index 0000000..142a271
--- /dev/null
+++ b/src/BeSimple/SoapClient/XmlMimeFilter.php
@@ -0,0 +1,75 @@
+<?php
+
+/*
+ * This file is part of the BeSimpleSoapClient.
+ *
+ * (c) Christian Kerl <christian-kerl@web.de>
+ * (c) Francis Besset <francis.besset@gmail.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace BeSimple\SoapClient;
+
+use BeSimple\SoapCommon\FilterHelper;
+use BeSimple\SoapCommon\Helper;
+use BeSimple\SoapCommon\Mime\MultiPart as MimeMultiPart;
+use BeSimple\SoapCommon\Mime\Parser as MimeParser;
+use BeSimple\SoapCommon\Mime\Part as MimePart;
+use BeSimple\SoapCommon\SoapRequest;
+use BeSimple\SoapCommon\SoapRequestFilter;
+use BeSimple\SoapCommon\SoapResponse;
+use BeSimple\SoapCommon\SoapResponseFilter;
+
+/**
+ * XML MIME filter that fixes the namespace of xmime:contentType attribute.
+ *
+ * @author Andreas Schamberger <mail@andreass.net>
+ */
+class XmlMimeFilter implements SoapRequestFilter
+{
+    /**
+     * Reset all properties to default values.
+     */
+    public function resetFilter()
+    {
+    }
+
+    /**
+     * Modify the given request XML.
+     *
+     * @param \BeSimple\SoapCommon\SoapRequest $request SOAP request
+     *
+     * @return void
+     */
+    public function filterRequest(SoapRequest $request)
+    {
+        // get \DOMDocument from SOAP request
+        $dom = $request->getContentDocument();
+
+        // create FilterHelper
+        $filterHelper = new FilterHelper($dom);
+
+        // add the neccessary namespaces
+        $filterHelper->addNamespace(Helper::PFX_XMLMIME, Helper::NS_XMLMIME);
+
+        // get xsd:base64binary elements
+        $xpath = new \DOMXPath($dom);
+        $xpath->registerNamespace('XOP', Helper::NS_XOP);
+        $query = '//XOP:Include/..';
+        $nodes = $xpath->query($query);
+
+        // exchange attributes
+        if ($nodes->length > 0) {
+            foreach ($nodes as $node) {
+                if ($node->hasAttribute('contentType')) {
+                    $contentType = $node->getAttribute('contentType');
+                    $node->removeAttribute('contentType');
+                    $filterHelper->setAttribute($node, Helper::NS_XMLMIME, 'contentType', $contentType);
+                }
+            }
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/tests/AxisInterop/MTOM.php b/tests/AxisInterop/MTOM.php
index cbfe886..2579c1d 100644
--- a/tests/AxisInterop/MTOM.php
+++ b/tests/AxisInterop/MTOM.php
@@ -7,12 +7,32 @@ require '../bootstrap.php';
 
 echo '<pre>';
 
+class base64Binary
+{
+    public $_;
+    public $contentType;
+}
+
+class AttachmentType
+{
+    public $fileName;
+    public $binaryData;
+}
+
+class AttachmentRequest extends AttachmentType
+{
+}
+
 $options = array(
     'soap_version'    => SOAP_1_1,
     'features'        => SOAP_SINGLE_ELEMENT_ARRAYS, // make sure that result is array for size=1
     'trace'           => true, // enables use of the methods  SoapClient->__getLastRequest,  SoapClient->__getLastRequestHeaders,  SoapClient->__getLastResponse and  SoapClient->__getLastResponseHeaders
     'attachment_type' => BeSimpleSoapHelper::ATTACHMENTS_TYPE_MTOM,
     'cache_wsdl'      => WSDL_CACHE_NONE,
+    'classmap'        => array(
+        'base64Binary'      => 'base64Binary',
+        'AttachmentRequest' => 'AttachmentRequest',
+    ),
 );
 
 /*
@@ -28,10 +48,13 @@ $sc = new BeSimpleSoapClient('MTOM.wsdl', $options);
 //var_dump($sc->__getTypes());
 
 try {
+    $b64 = new base64Binary();
+    $b64->_ = 'This is a test. :)';
+    $b64->contentType = 'text/plain';
 
-    $attachment = new stdClass();
+    $attachment = new AttachmentRequest();
     $attachment->fileName = 'test123.txt';
-    $attachment->binaryData = 'This is a test.';
+    $attachment->binaryData = $b64;
 
     var_dump($sc->attachment($attachment));
 
diff --git a/tests/AxisInterop/MTOM.wsdl b/tests/AxisInterop/MTOM.wsdl
index 178ee35..f0c9a6d 100644
--- a/tests/AxisInterop/MTOM.wsdl
+++ b/tests/AxisInterop/MTOM.wsdl
@@ -80,10 +80,10 @@
   </binding>
   <service name="MTOMSample">
     <port name="MTOMSampleSOAP12port_http" binding="tns:MTOMServiceSOAP12Binding">
-      <soap12:address location="http://192.168.0.104:8080/axis2/services/MTOMSample.MTOMSampleSOAP12port_http/"/>
+      <soap12:address location="http://localhost:8080/axis2/services/MTOMSample.MTOMSampleSOAP12port_http/"/>
     </port>
     <port name="MTOMSampleSOAP11port_http" binding="tns:MTOMServiceSOAP11Binding">
-      <soap:address location="http://192.168.0.104:8080/axis2/services/MTOMSample.MTOMSampleSOAP11port_http/"/>
+      <soap:address location="http://localhost:8080/axis2/services/MTOMSample.MTOMSampleSOAP11port_http/"/>
     </port>
   </service>
 </definitions>
diff --git a/tests/BeSimple/Tests/SoapClient/CurlTest.php b/tests/BeSimple/Tests/SoapClient/CurlTest.php
index b940b2a..d669f4c 100644
--- a/tests/BeSimple/Tests/SoapClient/CurlTest.php
+++ b/tests/BeSimple/Tests/SoapClient/CurlTest.php
@@ -23,11 +23,12 @@ class CurlTest extends \PHPUnit_Framework_TestCase
 
     protected function startPhpWebserver()
     {
-        if ('Windows' == substr(php_uname('s'), 0, 7 )) {
-            $powershellCommand = "\$app = start-process php.exe -ArgumentList '-S localhost:8000 -t ".__DIR__.DIRECTORY_SEPARATOR."Fixtures' -WindowStyle 'Hidden' -passthru; Echo \$app.Id;";
+            $dir = __DIR__.DIRECTORY_SEPARATOR.'Fixtures';
+        if ('Windows' == substr(php_uname('s'), 0, 7)) {
+            $powershellCommand = "\$app = start-process php.exe -ArgumentList '-S localhost:8000 -t ".$dir."' -WindowStyle 'Hidden' -passthru; Echo \$app.Id;";
             $shellCommand = 'powershell -command "& {'.$powershellCommand.'}"';
         } else {
-            $shellCommand = "nohup php -S localhost:8000 -t ".__DIR__.DIRECTORY_SEPARATOR."Fixtures &";
+            $shellCommand = "nohup php -S localhost:8000 -t ".$dir." &";
         }
         $output = array();
         exec($shellCommand, $output);
diff --git a/tests/BeSimple/Tests/SoapClient/WsdlDownloaderTest.php b/tests/BeSimple/Tests/SoapClient/WsdlDownloaderTest.php
index 14ac58a..198341d 100644
--- a/tests/BeSimple/Tests/SoapClient/WsdlDownloaderTest.php
+++ b/tests/BeSimple/Tests/SoapClient/WsdlDownloaderTest.php
@@ -24,11 +24,12 @@ class WsdlDownloaderTest extends \PHPUnit_Framework_TestCase
 
     protected function startPhpWebserver()
     {
-        if ('Windows' == substr(php_uname('s'), 0, 7 )) {
-            $powershellCommand = "\$app = start-process php.exe -ArgumentList '-S localhost:8000 -t ".__DIR__.DIRECTORY_SEPARATOR."Fixtures' -WindowStyle 'Hidden' -passthru; Echo \$app.Id;";
+        $dir = __DIR__.DIRECTORY_SEPARATOR.'Fixtures';
+        if ('Windows' == substr(php_uname('s'), 0, 7)) {
+            $powershellCommand = "\$app = start-process php.exe -ArgumentList '-S localhost:8000 -t ".$dir."' -WindowStyle 'Hidden' -passthru; Echo \$app.Id;";
             $shellCommand = 'powershell -command "& {'.$powershellCommand.'}"';
         } else {
-            $shellCommand = "nohup php -S localhost:8000 -t ".__DIR__.DIRECTORY_SEPARATOR."Fixtures &";
+            $shellCommand = "nohup php -S localhost:8000 -t ".$dir." &";
         }
         $output = array();
         exec($shellCommand, $output);
@@ -38,7 +39,7 @@ class WsdlDownloaderTest extends \PHPUnit_Framework_TestCase
     protected function stopPhpWebserver()
     {
         if (!is_null($this->webserverProcessId)) {
-            if ('Windows' == substr(php_uname('s'), 0, 7 )) {
+            if ('Windows' == substr(php_uname('s'), 0, 7)) {
                 exec('TASKKILL /F /PID ' . $this->webserverProcessId);
             } else {
                 exec('kill ' . $this->webserverProcessId);
@@ -57,7 +58,7 @@ class WsdlDownloaderTest extends \PHPUnit_Framework_TestCase
         $cacheDir = ini_get('soap.wsdl_cache_dir');
         if (!is_dir($cacheDir)) {
             $cacheDir = sys_get_temp_dir();
-            $cacheDirForRegExp = preg_quote( $cacheDir );
+            $cacheDirForRegExp = preg_quote($cacheDir);
         }
 
         $tests = array(
@@ -82,7 +83,7 @@ class WsdlDownloaderTest extends \PHPUnit_Framework_TestCase
         foreach ($tests as $name => $values) {
             $cacheFileName = $wd->download($values['source']);
             $result = file_get_contents($cacheFileName);
-            $this->assertRegExp($values['assertRegExp'],$result,$name);
+            $this->assertRegExp($values['assertRegExp'], $result, $name);
             unlink($cacheFileName);
         }
 
@@ -129,7 +130,7 @@ class WsdlDownloaderTest extends \PHPUnit_Framework_TestCase
         $cacheDir = ini_get('soap.wsdl_cache_dir');
         if (!is_dir($cacheDir)) {
             $cacheDir = sys_get_temp_dir();
-            $cacheDirForRegExp = preg_quote( $cacheDir );
+            $cacheDirForRegExp = preg_quote($cacheDir);
         }
 
         $remoteUrlAbsolute = 'http://localhost:8000/wsdlinclude/wsdlinctest_absolute.xml';
@@ -162,10 +163,10 @@ class WsdlDownloaderTest extends \PHPUnit_Framework_TestCase
         );
 
         foreach ($tests as $name => $values) {
-            $wsdl = file_get_contents( $values['source'] );
-            $method->invoke($wd, $wsdl, $values['cacheFile'],$values['remoteParentUrl']);
+            $wsdl = file_get_contents($values['source']);
+            $method->invoke($wd, $wsdl, $values['cacheFile'], $values['remoteParentUrl']);
             $result = file_get_contents($values['cacheFile']);
-            $this->assertRegExp($values['assertRegExp'],$result,$name);
+            $this->assertRegExp($values['assertRegExp'], $result, $name);
             unlink($values['cacheFile']);
         }
 
@@ -186,7 +187,7 @@ class WsdlDownloaderTest extends \PHPUnit_Framework_TestCase
         $cacheDir = ini_get('soap.wsdl_cache_dir');
         if (!is_dir($cacheDir)) {
             $cacheDir = sys_get_temp_dir();
-            $cacheDirForRegExp = preg_quote( $cacheDir );
+            $cacheDirForRegExp = preg_quote($cacheDir);
         }
 
         $remoteUrlAbsolute = 'http://localhost:8000/xsdinclude/xsdinctest_absolute.xml';
@@ -219,10 +220,10 @@ class WsdlDownloaderTest extends \PHPUnit_Framework_TestCase
         );
 
         foreach ($tests as $name => $values) {
-            $wsdl = file_get_contents( $values['source'] );
-            $method->invoke($wd, $wsdl, $values['cacheFile'],$values['remoteParentUrl']);
+            $wsdl = file_get_contents($values['source']);
+            $method->invoke($wd, $wsdl, $values['cacheFile'], $values['remoteParentUrl']);
             $result = file_get_contents($values['cacheFile']);
-            $this->assertRegExp($values['assertRegExp'],$result,$name);
+            $this->assertRegExp($values['assertRegExp'], $result, $name);
             unlink($values['cacheFile']);
         }