FaxJob, DeviceStatus and Win XP

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How get I a different 'Unknown' DeviceStatus with a FaxJob object?


My code:
----------------------------

if (CONNECTED)
{
_jobs=servidor.GetJobs() as FAXCOMLib.FaxJobs;
}



for (int pp=1; pp<=_jobs.Count;pp++)
{

ListViewItem lvi=new ListViewItem();

_jobs=servidor.GetJobs() as FAXCOMLib.FaxJobs;

_job=(FaxJob) trabajos.get_Item(pp);

lvi.Text=_job.JobId.ToString();

lvi.SubItems.Add(_job.QueueStatus);
lvi.SubItems.Add(_job.DeviceStatus); ----> 'Unknown' state forever. Why?

_job.Refresh();
listView2.Items.Add(lvi);
}
.