Something

<!-- Out -->
<iq xmlns="jabber:client" type="get" id="219">
<query xmlns="jabber:iq:roster" />
</iq>

<!-- In -->
<iq from='xxxxxxxxxx@jabber.fr' to='xxxxxxxxxx@jabber.fr/Gallifrey' type='error' xml:lang='en' id='219'>
<query xmlns='jabber:iq:roster'/>
<error code='503' type='cancel'>
<service-unavailable xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
</error>
</iq>