The Muezzin is responsible for the Adhān, and the leader of the congregation is responsible for the Iqāmah

‘Ali (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "The Muezzin is responsible for the Adhān, and the leader of the congregation is responsible for the Iqāmah."
Authentic hadith - Ibn Abi Shaybah - Al-Bayhaqi - ‘Abdur-Razzaaq

The noble Hadīth explains that the Muezzin is more entitled to determine the time of calling the Adhān, and that the Imām is more entitled to determine the time of calling the Iqāmah.

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