The Prophet ﷺ intended to do many things for calling (the people) to prayer, but he did not do any of them. Then Abdullah ibn Zayd was taught in a dream how to pronounce the call to prayer. He came to the Prophet ﷺ and informed him. He said: Teach it to Bilal. He then taught him, and Bilal made a call to prayer. Abdullah said: I saw it in a dream and I wished to pronounce it, but he (the Prophet) said: You should pronounce iqamah.  

أَرَادَ النَّبِيُّ ﷺ فِي الأَذَانِ أَشْيَاءَ لَمْ يَصْنَعْ مِنْهَا شَيْئًا قَالَ فَأُرِيَ عَبْدُ اللَّهِ بْنُ زَيْدٍ الأَذَانَ فِي الْمَنَامِ فَأَتَى النَّبِيَّ ﷺ فَأَخْبَرَهُ فَقَالَ أَلْقِهِ عَلَى بِلاَلٍ فَأَلْقَاهُ عَلَيْهِ فَأَذَّنَ بِلاَلٌ فَقَالَ عَبْدُ اللَّهِ أَنَا رَأَيْتُهُ وَأَنَا كُنْتُ أُرِيدُهُ قَالَ فَأَقِمْ أَنْتَ