maybe talk with your legal representative. they will be able to explain to you why this person keeps making a point of saying theres not enough time to talk with you at that moment...it may be that he is trying to set limits with the child that they cant be on the phone for long periods of time.

also sometimes mental disorders can mis interpret whats actually going on. sometimes what we with mental disorders perceive as yelling really isnt yelling.

one of my health issues makes me more sensitive to sounds. I kept telling my wife to stop yelling. to use a quieter voice. but it turned out she wasnt yelling. it was just my ears being overly sensitive due to medical and mental health problems.

another time when i thought people around me were yelling it turned out to be a symptom of being off my meds, that I had forgotten to take my meds...

my point is there are many reasons why it may seem like he is yelling, and maybe he is but because you are not living in that house and do not have visitation where you can see what is going on and know whats going on other than what you are hearing, the situation may not be what you are hearing in the background.

my suggestion contact your legal representative on the case and they can explain to you what is going on behind what you are hearing. and if it turns out to be as questionable and up[setting for the child as you are perceiving it to be, the legal representative can have an investigation done. you can also call child protective services and they will look into the matter to see if its as cut and dry as you are thinking it is ...a father constantly yelling at their child.