Specifies the Session Creation Message Specifies the Response message for Session Creation Request. If an error occurs, then at least one Parameter element SHALL be present in the response. Specifies the created session information If this element is present, it signals that there was an error w.r.t. to a parameter in the request. Specifies the Session Deletion Message Specifies the response message for Session Deletion Specifies the Stream Insertion Message Specifies the response message for Stream Insertion Specifies the Stream Removal Message Specifies the response message for Stream Removal