Not true, XMPP does have that feature and there are multiple clients which implement this. It works amazingly well. It&#x27;s not an extension, but part of the standard.<p>Example:<p><a href="http:&#x2F;&#x2F;conversations.im&#x2F;" rel="nofollow">http:&#x2F;&#x2F;conversations.im&#x2F;</a>