k">The authentication mechanism was called and a multi-step authentication dialog with the caller
 has been started (for instance, the caller has been redirected to a login page).</div>
</td>
</tr>
<tr class="altColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#SEND_FAILURE">SEND_FAILURE</a></span></code></th>
<td class="colLast">
<div class="block">The authentication mechanism was called but the caller was <em>not</em> successfully authenticated and
 therefore the caller