Sajda al-Tilawa and Returning the Salam for a Verse Recited on the Radio or a Tape Recorder
Question
If the verse of sajda al-tilawa is heard on a tape recorder or the radio, will the sajda al-tilawa become wajib? Also, in the cases mentioned, if “al-salamu ‘alayk” is heard, will replying also be wajib?
Answer
If the recitation and voice of a reciter or speaker have been preserved in some device, then hearing the verse of prostration from it does not make the sajda al-tilawa obligatory; the same is the ruling for the tape recorder. Replying to its salam is also not necessary. As for the radio, what caution (ihtiyat)
Source: Fatawa Mahmudiyya
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