Hi, Since iq has also been introduced for ibb recently (http://www.jabberstudio.org/cgi-bin/viewcvs.cgi/cvs/xmpp/extensions/xep-0047.xml?r1=1.2&r2=1.4), is there any way for client to declare that they prefer or support one over other ? None of the older clients are going to understand iq ibb stanzas for example : same for servers. Regards, Mridul