diff --git a/lib/Ratchet/Application/WAMP/App.php b/lib/Ratchet/Application/WAMP/App.php
index 5d4e67d..cf31c92 100644
--- a/lib/Ratchet/Application/WAMP/App.php
+++ b/lib/Ratchet/Application/WAMP/App.php
@@ -65,8 +65,14 @@ class App implements WebSocketAppInterface {
 
             case 2:
                 array_shift($json);
-                array_unshift($json, $from);
-                return call_user_func_array(array($this->_app, 'onCall'), $json);
+                $callID  = array_shift($json);
+                $procURI = array_shift($json);
+
+                if (count($json) == 1 && is_array($json[0])) {
+                    $json = $json[0];
+                }
+
+                return $this->_app->onCall($from, $callID, $procURI, $json);
             break;
 
             case 5:
@@ -93,7 +99,7 @@ class App implements WebSocketAppInterface {
      * @return string
      */
     protected function getUri(Connection $conn, $uri) {
-        $ret = (isset($conn->WAMP->prefixes[$uri]) ? $conn->WAMP->prefixes[$uri] : $uri);
+        return (isset($conn->WAMP->prefixes[$uri]) ? $conn->WAMP->prefixes[$uri] : $uri);
     }
 
     public function __construct(ServerInterface $app) {
diff --git a/lib/Ratchet/Application/WAMP/Command/Action/Event.php b/lib/Ratchet/Application/WAMP/Command/Action/Event.php
index 77bc270..fac4428 100644
--- a/lib/Ratchet/Application/WAMP/Command/Action/Event.php
+++ b/lib/Ratchet/Application/WAMP/Command/Action/Event.php
@@ -10,6 +10,7 @@ class Event extends SendMessage {
     /**
      * @param ...
      * @param string
+     * @return Event
      */
     public function setEvent($uri, $msg) {
         return $this->setMessage(json_encode(array(8, $uri, (string)$msg)));
diff --git a/lib/Ratchet/Application/WAMP/ServerInterface.php b/lib/Ratchet/Application/WAMP/ServerInterface.php
index b636f2d..f072181 100644
--- a/lib/Ratchet/Application/WAMP/ServerInterface.php
+++ b/lib/Ratchet/Application/WAMP/ServerInterface.php
@@ -33,9 +33,10 @@ interface ServerInterface {
      * @param Ratchet\Resource\Connection
      * @param string
      * @param ...
+     * @param array Call parameters received from the client
      * @return Ratchet\Resource\Command\CommandInterface|null
      */
-    function onCall();
+    function onCall(Connection $conn, $id, $procURI, array $params);
 
     /**
      * A request to subscribe to a URI has been made