There Is between the two calls (Adhan and Iqama) a prayer. And he mentioned it three times, and at the third time he said: This applies to those who wish to do it.
قَالَ رَسُولُ اللَّهِ ﷺ بَيْنَ كُلِّ أَذَانَيْنِ صَلاَةٌ قَالَهَا ثَلاَثًا قَالَ فِي الثَّالِثَةِ لِمَنْ شَاءَ