<iq to="ROOM@conference.nimbuzz.com" type="set" id="muc_owner"><query xmlns="http://jabber.org/protocol/muc#owner"><x xmlns="jabber:x:data" type="submit"><field var="FORM_TYPE"><value>http://jabber.org/protocol/muc#roomconfig</value></field><field var="muc#roomconfig_roomname"><value>ROOM</value></field><field var="muc#roomconfig_maxusers" type="list-single"><value>30</value></field></x></query></iq>