With XMPP specifically in mind, if the user isn't registered then it has no roster. In theory you could store a list of jid on the client side but you still need an account to send messages "from". Cheers Kirk <div class="gmail_quote">On 20 Apr 2013 03:31, "<a href="mailto:jiyanbao@gmail.com">jiyanbao@gmail.com</a>" <<a href="mailto:jiyanbao@gmail.com">jiyanbao@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hi everyone, I'm developing an online customer service system, but the problem is : how to talk with online visitors？because the xmpp requires that subscription has done before talking each other. so, how to get the roster when the user did not register? thanks. _______________________________________________ JDev mailing list Info: <a href="http://mail.jabber.org/mailman/listinfo/jdev" target="_blank">http://mail.jabber.org/mailman/listinfo/jdev</a> Unsubscribe: <a href="mailto:JDev-unsubscribe@jabber.org">JDev-unsubscribe@jabber.org</a> _______________________________________________ </blockquote></div>