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  

My grandfather pronounced the Iqamah.  

فَأَقَامَ جَدِّي  

When the adhan for the dawn prayer was initially introduced, the Prophet ﷺ commanded me to call the adhan and I did so. Then I began to ask: Should I utter iqamah, Messenger of Allah? But he began to look at the direction of the east, (waiting) for the break of dawn, and said: No. When the dawn broke, he came down and performed ablution and he then turned to me. In the meantime his Companions joined him. Then Bilal wanted to utter the iqamah, but the Prophet ﷺ said to him: The man of Suda' has called the adhan, and he who calls the adhan utters the iqamah.  

لَمَّا كَانَ أَوَّلُ أَذَانِ الصُّبْحِ أَمَرَنِي يَعْنِي النَّبِيَّ ﷺ فَأَذَّنْتُ فَجَعَلْتُ أَقُولُ أُقِيمُ يَا رَسُولَ اللَّهِ فَجَعَلَ يَنْظُرُ إِلَى نَاحِيَةِ الْمَشْرِقِ إِلَى الْفَجْرِ فَيَقُولُ لاَ حَتَّى إِذَا طَلَعَ الْفَجْرُ نَزَلَ فَبَرَزَ ثُمَّ انْصَرَفَ إِلَىَّ وَقَدْ تَلاَحَقَ أَصْحَابُهُ يَعْنِي فَتَوَضَّأَ فَأَرَادَ بِلاَلٌ أَنْ يُقِيمَ فَقَالَ لَهُ نَبِيُّ اللَّهِ ﷺ إِنَّ أَخَا صُدَاءٍ هُوَ أَذَّنَ وَمَنْ أَذَّنَ فَهُوَ يُقِيمُ قَالَ فَأَقَمْتُ