FS-8553 [config] include verto_contact into the dial-string in the samples

conf/vanilla/directory/default.xml

@@ -21,7 +21,7 @@
   <!--the domain or ip (the right hand side of the @ in the addr-->
   <domain name="$${domain}">
     <params>
-      <param name="dial-string" value="{^^:sip_invite_domain=${dialed_domain}:presence_id=${dialed_user}@${dialed_domain}}${sofia_contact(*/${dialed_user}@${dialed_domain})}"/>
+      <param name="dial-string" value="{^^:sip_invite_domain=${dialed_domain}:presence_id=${dialed_user}@${dialed_domain}}${sofia_contact(*/${dialed_user}@${dialed_domain})},${verto_contact(${dialed_user}@${dialed_domain})}"/>
       <!-- These are required for Verto to function properly -->
       <param name="jsonrpc-allowed-methods" value="verto"/>
       <!-- <param name="jsonrpc-allowed-event-channels" value="demo,conference,presence"/> -->