The muezzin gave the adhaan for Fajr when he was praying Witr

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Check below answers in case you are looking for other related questions:
Ways of offering Witr prayer that are narrated in the reports
When does the time for Witr end?

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Related Answers:
The two rak’ahs of Fajr replace Tahiyyat al-Masjid (greeting the mosque)
Is the Sunnah prayer before Zuhr two rak’ahs or four rak’ahs?
He wants to offer naafil prayers after praying Zuhr and ‘Asr in ‘Arafah
Ways of offering Witr prayer that are narrated in the reports
When does the time for Witr end?

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