Raising the voice for the closing salam after forgetting to say it aloud

Question:
in congregation, then he said the salam with a low voice after finishing it, and he forgot to say it aloud, and after that he raised his voice for the salam again. Does he have to perform the prostration for forgetfulness? What is the ruling on this act

Answer:
If they did not hear him, he should raise his voice in the salam and not perform the prostration for forgetfulness. He raises his voice so that the ma'mum (those praying behind him) can hear him and say the salam with him, and he does not perform the prostration for forgetfulness. Yes.