The list that would make me separate a bird and ring somebody: gurgling or rattling or clicking with each breath, an open bill or gasping, bubbles or discharge at the nostrils or eyes, swelling round the face, sneezing and head shaking, or a bird sitting fluffed and off its feed.
Respiratory infections move through a pen, so the separating comes first and the phone call second. With twenty birds in one run that is worth knowing before you need it.