Answer Of Salam During Salah
It is not allowed to talk to another person during Salah, whether it be replying to Salam of another person. If required, a gesture of hand can be done, that too is not obligatory. Such a gesture can help other person know that one is offering Salah and cannot respond at the moment. Please read the following for references to different narrations in this regard: https://www.islamweb.net/en/fatwa/362386/returning-salaam-while-praying https://islamqa.info/en/answers/8599/can-you-give-salam-to-someone-who-is-praying