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Hello,
Maybe someone can help me. I would like to disable notification sounds during a call. The beep sound is very loud and disruptive to the call.
Thank you for your help.
Try Settings then Call settings then Additional settings and untick Call waiting - Not sure if this will work for emails etc
unfortunately thats not it 
Try this, it has work for me, while on a call, pull down the notification bar > quick settings > sound > turn it off (not on vibrate but off) that should disable notifications while on a call.
Quite frankly i'm amazed that sony hasn't done anything to redeme this
Still no solution for this?
It is extremely disturbing.
Hated that too. They're callilng it peeking.
Go to settings, Sound & notification, App notifications. You have to disable peeking for each app inside.