diff --git a/src/BeSimple/SoapCommon/Helper.php b/src/BeSimple/SoapCommon/Helper.php
new file mode 100644
index 0000000..6d11b0f
--- /dev/null
+++ b/src/BeSimple/SoapCommon/Helper.php
@@ -0,0 +1,194 @@
+<?php
+
+/*
+ * This file is part of BeSimpleSoapCommon.
+ *
+ * (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\SoapCommon;
+
+/**
+ * Soap helper class with static functions that are used in the client and
+ * server implementations. It also provides namespace and configuration
+ * constants.
+ *
+ * @author Andreas Schamberger <mail@andreass.net>
+ */
+class Helper
+{
+    /**
+     * Attachment type: xsd:base64Binary (native in ext/soap).
+     */
+    const ATTACHMENTS_TYPE_BASE64 = 1;
+
+    /**
+     * Attachment type: MTOM (SOAP Message Transmission Optimization Mechanism).
+     */
+    const ATTACHMENTS_TYPE_MTOM = 2;
+
+    /**
+     * Attachment type: SWA (SOAP Messages with Attachments).
+     */
+    const ATTACHMENTS_TYPE_SWA = 4;
+
+    /**
+     * Web Services Security: SOAP Message Security 1.0 (WS-Security 2004)
+     */
+    const NAME_WSS_SMS = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0';
+
+    /**
+     * Web Services Security: SOAP Message Security 1.1 (WS-Security 2004)
+     */
+    const NAME_WSS_SMS_1_1 = 'http://docs.oasis-open.org/wss/oasis-wss-soap-message-security-1.1';
+
+    /**
+     * Web Services Security UsernameToken Profile 1.0
+     */
+    const NAME_WSS_UTP = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0';
+
+    /**
+     * Web Services Security X.509 Certificate Token Profile
+     */
+    const NAME_WSS_X509 = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0';
+
+    /**
+     * Soap 1.1 namespace.
+     */
+    const NS_SOAP_1_1 = 'http://schemas.xmlsoap.org/soap/envelope/';
+
+    /**
+     * Soap 1.1 namespace.
+     */
+    const NS_SOAP_1_2 = 'http://www.w3.org/2003/05/soap-envelope/';
+
+    /**
+     * Web Services Addressing 1.0 namespace.
+     */
+    const NS_WSA = 'http://www.w3.org/2005/08/addressing';
+
+    /**
+     * Web Services Security Extension namespace.
+     */
+    const NS_WSS = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd';
+
+    /**
+     * Web Services Security Utility namespace.
+     */
+    const NS_WSU = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd';
+
+    /**
+     * Describing Media Content of Binary Data in XML namespace.
+     */
+    const NS_XMLMIME = 'http://www.w3.org/2004/11/xmlmime';
+
+    /**
+     * XML Schema namespace.
+     */
+    const NS_XML_SCHEMA = 'http://www.w3.org/2001/XMLSchema';
+
+    /**
+     * XML Schema instance namespace.
+     */
+    const NS_XML_SCHEMA_INSTANCE = 'http://www.w3.org/2001/XMLSchema-instance';
+
+    /**
+     * XML-binary Optimized Packaging namespace.
+     */
+    const NS_XOP = 'http://www.w3.org/2004/08/xop/include';
+
+    /**
+     * Web Services Addressing 1.0 prefix.
+     */
+    const PFX_WSA = 'wsa';
+
+    /**
+     * Web Services Security Extension namespace.
+     */
+    const PFX_WSS = 'wsse';
+
+    /**
+     * Web Services Security Utility namespace prefix.
+     */
+    const PFX_WSU  = 'wsu';
+
+    /**
+     * Describing Media Content of Binary Data in XML namespace prefix.
+     */
+    const PFX_XMLMIME = 'xmlmime';
+
+    /**
+     * XML Schema namespace prefix.
+     */
+    const PFX_XML_SCHEMA = 'xsd';
+
+    /**
+     * XML Schema instance namespace prefix.
+     */
+    const PFX_XML_SCHEMA_INSTANCE = 'xsi';
+
+    /**
+     * XML-binary Optimized Packaging namespace prefix.
+     */
+    const PFX_XOP = 'xop';
+
+    /**
+     * Generate a pseudo-random version 4 UUID.
+     *
+     * @see http://de.php.net/manual/en/function.uniqid.php#94959
+     * @return string
+     */
+    public static function generateUUID()
+    {
+        return sprintf(
+            '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
+            // 32 bits for "time_low"
+            mt_rand(0, 0xffff), mt_rand(0, 0xffff),
+            // 16 bits for "time_mid"
+            mt_rand(0, 0xffff),
+            // 16 bits for "time_hi_and_version",
+            // four most significant bits holds version number 4
+            mt_rand(0, 0x0fff) | 0x4000,
+            // 16 bits, 8 bits for "clk_seq_hi_res",
+            // 8 bits for "clk_seq_low",
+            // two most significant bits holds zero and one for variant DCE1.1
+            mt_rand(0, 0x3fff) | 0x8000,
+            // 48 bits for "node"
+            mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
+       );
+    }
+
+    /**
+     * Get SOAP namespace for the given $version.
+     *
+     * @param int $version SOAP_1_1|SOAP_1_2
+     * @return string
+     */
+    public static function getSoapNamespace($version)
+    {
+        if ($version === SOAP_1_2) {
+            return self::NS_SOAP_1_2;
+        } else {
+            return self::NS_SOAP_1_1;
+        }
+    }
+
+    /**
+     * Get SOAP version from namespace URI.
+     *
+     * @param string $namespace NS_SOAP_1_1|NS_SOAP_1_2
+     * @return int SOAP_1_1|SOAP_1_2
+     */
+    public static function getSoapVersionFromNamespace($namespace)
+    {
+        if ($namespace === self::NS_SOAP_1_2) {
+            return SOAP_1_2;
+        } else {
+            return SOAP_1_1;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/BeSimple/SoapCommon/Mime/MultiPart.php b/src/BeSimple/SoapCommon/Mime/MultiPart.php
index 6267b77..810b655 100644
--- a/src/BeSimple/SoapCommon/Mime/MultiPart.php
+++ b/src/BeSimple/SoapCommon/Mime/MultiPart.php
@@ -10,7 +10,9 @@
  * with this source code in the file LICENSE.
  */
 
-namespace BeSimple\SoapCommon;
+namespace BeSimple\SoapCommon\Mime;
+
+use BeSimple\SoapCommon\Helper;
 
 /**
  * Mime multi part container.
@@ -174,7 +176,6 @@ class MultiPart extends PartHeader
      */
     protected function generateBoundary()
     {
-        // TODO
-        return 'urn:uuid:' . \ass\Soap\Helper::generateUUID();
+        return 'urn:uuid:' . Helper::generateUUID();
     }
 }
\ No newline at end of file
diff --git a/src/BeSimple/SoapCommon/Mime/Parser.php b/src/BeSimple/SoapCommon/Mime/Parser.php
index c7b815f..b5b78e0 100644
--- a/src/BeSimple/SoapCommon/Mime/Parser.php
+++ b/src/BeSimple/SoapCommon/Mime/Parser.php
@@ -10,7 +10,7 @@
  * with this source code in the file LICENSE.
  */
 
-namespace BeSimple\SoapCommon;
+namespace BeSimple\SoapCommon\Mime;
 
 /**
  * Simple Multipart-Mime parser.
diff --git a/src/BeSimple/SoapCommon/Mime/Part.php b/src/BeSimple/SoapCommon/Mime/Part.php
index 45065ab..88a2ca7 100644
--- a/src/BeSimple/SoapCommon/Mime/Part.php
+++ b/src/BeSimple/SoapCommon/Mime/Part.php
@@ -10,7 +10,9 @@
  * with this source code in the file LICENSE.
  */
 
-namespace BeSimple\SoapCommon;
+namespace BeSimple\SoapCommon\Mime;
+
+use BeSimple\SoapCommon\Helper;
 
 /**
  * Mime part. Everything must be UTF-8. Default charset for text is UTF-8.
@@ -159,7 +161,6 @@ class Part extends PartHeader
      */
     protected function generateContentId()
     {
-        // TODO
-        return 'urn:uuid:' . \ass\Soap\Helper::generateUUID();
+        return 'urn:uuid:' . Helper::generateUUID();
     }
 }
\ No newline at end of file
diff --git a/src/BeSimple/SoapCommon/Mime/PartHeader.php b/src/BeSimple/SoapCommon/Mime/PartHeader.php
index 4dc3d06..fea2694 100644
--- a/src/BeSimple/SoapCommon/Mime/PartHeader.php
+++ b/src/BeSimple/SoapCommon/Mime/PartHeader.php
@@ -10,7 +10,7 @@
  * with this source code in the file LICENSE.
  */
 
-namespace BeSimple\SoapCommon;
+namespace BeSimple\SoapCommon\Mime;
 
 /**
  * Mime part base class.