cherrypick Change-Id: I5b52c5d11e111a9dab2b08fd44a439ab4db04dd2

Doc change: Adding new docs for SIP API

Change-Id: I62bedbcaab3900edcc49d67b59279c5025977a95

Author: labtopia

docs/html/guide/guide_toc.cs

@@ -243,6 +243,10 @@ localized titles are added in the language order specified below.
       <li><a href="<?cs var:toroot?>guide/topics/wireless/bluetooth.html">
             <span class="en">Bluetooth</span>
           </a></li>
+       <li><a href="<?cs var:toroot?>guide/topics/sip/SIP.html">
+            <span class="en">Session Initiation Protocol</span></a>
+            <span class="new">new!</span>
+          </li>
       <li class="toggle-list">
         <div><a href="<?cs var:toroot?>guide/topics/search/index.html">
             <span class="en">Search</span>