Adding some lines like these to the provisioning response worked for me:
On Fri, Sep 23, 2011 at 6:55 AM, Patrick <email@example.com> wrote:
Jitsi always starts minimized in the traybar after a successful
provisioning via URI.
Is there a setting (that could be set via provisioning preferably) to
have it opening maximized after the user has entered its credentials
in the popup ?
Thanks in advance