Our expert says:
As his manager, don't you ( perhaps in consultation with HR ? ) have the right, even responsibility, to speak calmly but firmly to him about his excessive tome on the phone rather than doing the work he's paid for, and how his unnecessary noises distract others ? One should be polite, but there's no point in being subtle to someone so thick-skinned. Just say it.
Maria has some good suggestions there of tactful alternatives or supplements.
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