Prayer: Doubts During Adhan and Iqamah
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 923
If a person has started adhan or iqamah and before saying some [particular] part of it he doubts whether he said the previous part or not, he must say the part about which he doubts; but if while saying some part of adhan and iqamah he doubts whether he said the previous part or not, then saying it is not necessary.