Answered by Shaykh Faraz Rabbani
Iqamah is same as Adhaan with addition of Qad qamat as-salah’ why is this so? with the hadith indicating that it should be ‘half’ (not the words of hadith) of the adhaan.
Walaikum assalam wa rahmatullah,
In relation to the mujtahid, all the primary evidence (Qur’an, and sunna), and secondary interpretative tools (qiyas, understanding of the sahaba, ijma`, etc) are pieced together in a coherent manner.
Imam Tahawi explained in his Sharh Ma`ani al-Athar [1.132-135] that we have mutawatir (multiple contiguous) reports that Sayyiduna Bilal (Allah be pleased with him) used to give both the adhan and iqama with repetition of their phrases. This was also mentioned by Imam Zayla`i in his Tabyin al-Haqa’iq Sharh Kanz al-Daqa’iq [1.91]
This is how the adhan and iqama of the angel who descended from the sky [when the adhan was legislated] were transmitted with rigorously authentic chains of transmissions that Abd Allah ibn Zaid al-Ansari (Allah be pleased with him) came to the Prophet (Allah bless him and give him peace) and asked, O Messenger of Allah! In my dream, I saw a man wearing green clothing stand up on a wall and gave the adhan repeating each phrase twice, and the iqama repeating each phrase twice.’ [Nasa’i 632; Abu Dawud, 503; Ibn Maja 708; Ahmad 3/409]
As for the hadiths in Bukhari and Muslim that the iqama is singularized,’ Imam Kamal ibn al-Humam explained that the Hanafi understanding that this does not refer to its words, but that it is given in a single tone of voice, in a speedy manner such as each pair of phrases is said in one go. This is contrary to the adhan, where one pauses between each pair of phrases, so it is doubled’. [ Fath al-Qadir, 1.243-245]
The position that the iqama is doubled like the adhan was reported by Ibn Abi Shayba in his Musannaf [1.234-235] as being the position of `Ali, Salama ibn al-Akwa`, Abd Allah ibn Zayd, and Bilal (Allah be pleased with them). The latter two were both among the muezzins of the Messenger of Allah (Allah bless him and give him peace). This is also reported as having been the position of the many students of Ali and Abd Allah ibn Mas`ud (Allah be pleased with them), two of the major fuqaha of the Companions who taught a lot.
And Allah alone gives success.
Walaikum assalam wa rahmatullah,
Faraz Rabbani.