Re: Custom Stream Management Callbacks

My blind guess is that he refers to something like this:

<stream:features>

        <starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>

        <compression xmlns="http://jabber.org/features/compress">

            <method>zlib</method>

        </compression>

        <push xmlns="p1:push"/>

        <rebind xmlns="p1:rebind"/>

        <ack xmlns="p1:ack"/>

which seems to be a proprietary protocol used by process-one.net, probably similar to XEP-0198.