S: <iq from="chat4.im" to="wojtek@chat4.im/atlantiscity" type="get" id="tigase-ping">
<ping xmlns="urn:xmpp:ping"/>
</iq>

C: <iq to="chat4.im" type="result" id="tigase-ping"/>

S: <iq from="chat4.im" to="wojtek@chat4.im/atlantiscity" type="error" id="tigase-ping">
<error code="400" type="modify">
<bad-request xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/>
<text xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" xml:lang="en">XMPP error condition: bad-request </text>
</error>
</iq>