Praise be to Allaah.
We put this question to Shaykh Muhammad ibn Saalih al-‘Uthaymeen, may Allaah preserve him, who replied as follows:
This muezzin must be disciplined; the rest of the people have to repent, but they do not have to do any other prayer. And Allaah knows best.
Sheikh Muhammed Salih Al-Munajjid