Binding a user session is done by sending a request using HTTP POST method for /rest/adhoc/bosh@domain.com
with the following content:
Note
Request requires authentication using Basic HTTP Authentication
<command> <node>pre-bind-bosh-session</node> <fields> <item> <var>from</var> <value>user_jid@domain/resource</value> </item> <item> <var>hold</var> <value>1</value> </item> <item> <var>wait</var> <value>60</value> </item> </fields> </command>