Forgetting to call out a certain phrase in Azaan

Q: If during the azaan, one forgets to call out a certain phrase then what should one do?
A: If one remembers during the azaan or immediately upon completing the azaan before speaking, then he should only recite the omitted phrase and continue from the point where he had stopped. However, if he recites the omitted phrase and continues from that point (repeating the phrases after the omitted phrase which he had already called out), it will be better, so that the entire azaan is called out according to the sunnah sequence. However, if he remembers after completing the azaan and he had spoken then he should repeat the azaan from the beginning.