In Hanafi practice the basmalah is quiet even when the remaining recitation is audible. Reports from Anas concerning prayer behind the Prophet and early caliphs are used in this discussion.
Al-Shafi‘i favors audible basmalah in audible prayers and cites other narrations together with the view that it is part of al-Fatihah. Hadith scholars debate wording and transmission of individual reports; the legal dispute is not adequately summarized by a single unqualified narration.