The ruling on interrupting a voluntary prayer when the iqamah is called

Question:
May Allah reward you with good. This questioner says: If a person is praying the greeting of the mosque, and the iqamah is called while he is praying, does he complete the prayer or interrupt it? And if he interrupts it, what is the manner of interrupting it? Does he say the taslim in the prayer, or what?

Answer:
If he is at the beginning of the prayer, it is better for him to interrupt it, because he would miss part of the obligatory prayer. But if he is at the end of the voluntary prayer, and he would not miss much of it, then he completes it. This is the best of the opinions in this issue. Some scholars hold that he should interrupt it in all cases, and some hold that he should not interrupt it in all cases, but rather complete it briefly. However, the best, and Allah knows best, is that if he is at the beginning, he interrupts it, and if he is at the end or most of it has passed, he completes it.