Is it obligatory to cut off a voluntary prayer if the obligatory prayer is called for?

Question:
He says: If the prayer is called for while I am praying the sunnah, do I cut off the sunnah prayer or complete it?

Answer:
In the hadith, the Prophet (peace and blessings be upon him) said The scholars differed on this, but they agreed that if the iqamah is called, one does not enter into a voluntary prayer. One does not start a voluntary prayer after the iqamah. This is by consensus.
But if the iqamah is called while he is in the middle of a voluntary prayer, some scholars say he should complete it briefly and join the prayer, while others say he should cut it off, acting on the apparent meaning of the hadith. And perhaps the closest view, if Allah wills, is that if he is at the end of it, at the end of the voluntary prayer, he should complete it, because he has not missed anything like that. But if he is at the beginning of it, he should cut it off. Yes.