diff --git a/plugin/ims_lti/src/ImsLtiServiceRequestFactory.php b/plugin/ims_lti/src/ImsLtiServiceRequestFactory.php
index 8c8dd4967a..0756e96aab 100644
--- a/plugin/ims_lti/src/ImsLtiServiceRequestFactory.php
+++ b/plugin/ims_lti/src/ImsLtiServiceRequestFactory.php
@@ -16,13 +16,19 @@ class ImsLtiServiceRequestFactory
         $bodyChildren = $xml->imsx_POXBody->children();
 
         if (!empty($bodyChildren)) {
-            switch ($bodyChildren->getName()) {
+            $name = $bodyChildren->getName();
+
+            switch ($name) {
                 case 'replaceResultRequest':
                     return new ImsLtiServiceReplaceRequest($xml);
                 case 'readResultRequest':
                     return new ImsLtiServiceReadRequest($xml);
                 case 'deleteResultRequest':
                     return new ImsLtiServiceDeleteRequest($xml);
+                default:
+                    $name = str_replace(['ResultRequest', 'Request'], '', $name);
+
+                    return new ImsLtiServiceUnsupportedRequest($xml, $name);
             }
         }
 
diff --git a/plugin/ims_lti/src/ImsLtiServiceResponseFactory.php b/plugin/ims_lti/src/ImsLtiServiceResponseFactory.php
index 9cac5508f0..cb8b0ae516 100644
--- a/plugin/ims_lti/src/ImsLtiServiceResponseFactory.php
+++ b/plugin/ims_lti/src/ImsLtiServiceResponseFactory.php
@@ -22,6 +22,8 @@ class ImsLtiServiceResponseFactory
                 return new ImsLtiServiceReadResponse($statusInfo, $bodyParam);
             case ImsLtiServiceResponse::TYPE_DELETE:
                 return new ImsLtiServiceDeleteResponse($statusInfo, $bodyParam);
+            default:
+                return new ImsLtiServiceUnsupportedResponse($statusInfo, $type);
         }
 
         return null;
diff --git a/plugin/ims_lti/src/ImsLtiServiceResponseStatus.php b/plugin/ims_lti/src/ImsLtiServiceResponseStatus.php
index 5f06c2bf91..4fb535d488 100644
--- a/plugin/ims_lti/src/ImsLtiServiceResponseStatus.php
+++ b/plugin/ims_lti/src/ImsLtiServiceResponseStatus.php
@@ -13,7 +13,7 @@ class ImsLtiServiceResponseStatus
     const CODEMAJOR_SUCCESS = 'success';
     const CODEMAJOR_PROCESSING = 'processing';
     const CODEMAJOR_FAILURE = 'failure';
-    const CODEMAJOR_UNSUPPORTED = 'supported';
+    const CODEMAJOR_UNSUPPORTED = 'unsupported';
 
     /**
      * @var string
diff --git a/plugin/ims_lti/src/ImsLtiServiceUnsupportedRequest.php b/plugin/ims_lti/src/ImsLtiServiceUnsupportedRequest.php
new file mode 100644
index 0000000000..28f79f4d6e
--- /dev/null
+++ b/plugin/ims_lti/src/ImsLtiServiceUnsupportedRequest.php
@@ -0,0 +1,31 @@
+<?php
+/* For licensing terms, see /license.txt */
+
+/**
+ * Class ImsLtiServiceUnsupportedRequest.
+ */
+class ImsLtiServiceUnsupportedRequest extends ImsLtiServiceRequest
+{
+    /**
+     * ImsLtiDeleteServiceRequest constructor.
+     *
+     * @param SimpleXMLElement $xml
+     * @param string           $name
+     */
+    public function __construct(SimpleXMLElement $xml, $name)
+    {
+        parent::__construct($xml);
+
+        $this->responseType = $name;
+    }
+
+    protected function processBody()
+    {
+        $this->statusInfo
+            ->setSeverity(ImsLtiServiceResponseStatus::SEVERITY_STATUS)
+            ->setCodeMajor(ImsLtiServiceResponseStatus::CODEMAJOR_UNSUPPORTED)
+            ->setDescription(
+                $this->responseType.' is not supported'
+            );
+    }
+}
diff --git a/plugin/ims_lti/src/ImsLtiServiceUnsupportedResponse.php b/plugin/ims_lti/src/ImsLtiServiceUnsupportedResponse.php
new file mode 100644
index 0000000000..1d45f583cb
--- /dev/null
+++ b/plugin/ims_lti/src/ImsLtiServiceUnsupportedResponse.php
@@ -0,0 +1,28 @@
+<?php
+/* For licensing terms, see /license.txt */
+
+/**
+ * Class ImsLtiServiceUnsupportedResponse.
+ */
+class ImsLtiServiceUnsupportedResponse extends ImsLtiServiceResponse
+{
+    /**
+     * ImsLtiServiceUnsupportedResponse constructor.
+     *
+     * @param ImsLtiServiceResponseStatus $statusInfo
+     * @param string                      $type
+     */
+    public function __construct(ImsLtiServiceResponseStatus $statusInfo, $type)
+    {
+        $statusInfo->setOperationRefIdentifier($type);
+
+        parent::__construct($statusInfo);
+    }
+
+    /**
+     * @param SimpleXMLElement $xmlBody
+     */
+    protected function generateBody(SimpleXMLElement $xmlBody)
+    {
+    }
+}